SRAM GX Type 2.1 10 Speed Rear DerailleurThis SRAM GX 10-speed rear mechanism is developed to work with the SRAM 10 speed MTB shifters and a 2x chainring setup. Using a 1:1 cable pull ratio and a rolling bearing clutch this tough component will ensure you have a crisp and precise gear change.Leveraging the legendary history of SRAM shifting, the GX 2x10 rear derailleur provides incredible shifting speed and precision. EXACT ACTUATION technology eliminates chain slackness and shifting variation. ROLLER BEARING CLUTCH technology delivers maximum drivetrain stability-even through the most punishing terrain. And with CAGE LOCK technology, wheel removal and installation are easier than ever.Features: Material: Aluminium Speed: 10-Speed Mount Type: Standard hanger mount Compatibility: Exact Actuation Recommended Group: GX 2x10 Maximum Cassette Low Sprocket Capacity: 36T Shifter Capability: SRAM 10 speed flat bar shifters ONLY Cable Pull Ratio: 1:1 SRAM Part No. RD-GX-T21-A1 Weight: 302gCage Length Information:Short Cage Option: Total chain wrap capacity of 30T (Ideal for use with downhill (DH) / enduro bikes with a smaller chainring up front)Medium Cage Option: Total chain wrap capacity of 35T (Ideal for use with all mountain (AM) / trail bikes with a medium chainring up front)Long Cage Option: Total chain wrap capacity of 47T (ideal for use with touring bikes with a larger chainring up front)Technologies: Exact Actuation - SRAM launched their road technology from scratch, they reapplied their MTB proven SRAM 1:1 actuation ratio (shifter cable travel: derailleur movement) for 10 speed rear shifting. EA helps to simplify/stabilise the uneasy act of balancing rear derailleur hanger design, tight cog spacing and exact cable tension. The result: the easiest index shifting system to set up and it stays that way. Cage Lock: With this technology in the rear derailleur, wheel removal and installation, as well as chain installation, becomes faster and simpler. Just pushing the cage forward to create slack and lock it into place. Roller Bearing Clutch: Rear derailleurs with the technology deliver maximum drivetrain stability, even through the most punishing terrain. With Roller Bearing Clutch technology, derailleur bounce and chain slap are eliminated without sacrificing precisionBuy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM GX Type 2.1 10 Speed Rear DerailleurThis SRAM GX 10-speed rear mechanism is developed to work with the SRAM 10 speed MTB shifters and a 2x chainring setup. Using a 1:1 cable pull ratio and a rolling bearing clutch this tough component will ensure you have a crisp and precise gear change.Leveraging the legendary history of SRAM shifting, the GX 2x10 rear derailleur provides incredible shifting speed and precision. EXACT ACTUATION technology eliminates chain slackness and shifting variation. ROLLER BEARING CLUTCH technology delivers maximum drivetrain stability-even through the most punishing terrain. And with CAGE LOCK technology, wheel removal and installation are easier than ever.Features: Material: Aluminium Speed: 10-Speed Mount Type: Standard hanger mount Compatibility: Exact Actuation Recommended Group: GX 2x10 Maximum Cassette Low Sprocket Capacity: 36T Shifter Capability: SRAM 10 speed flat bar shifters ONLY Cable Pull Ratio: 1:1 SRAM Part No. RD-GX-T21-A1 Weight: 302gCage Length Information:Short Cage Option: Total chain wrap capacity of 30T (Ideal for use with downhill (DH) / enduro bikes with a smaller chainring up front)Medium Cage Option: Total chain wrap capacity of 35T (Ideal for use with all mountain (AM) / trail bikes with a medium chainring up front)Long Cage Option: Total chain wrap capacity of 47T (ideal for use with touring bikes with a larger chainring up front)Technologies: Exact Actuation - SRAM launched their road technology from scratch, they reapplied their MTB proven SRAM 1:1 actuation ratio (shifter cable travel: derailleur movement) for 10 speed rear shifting. EA helps to simplify/stabilise the uneasy act of balancing rear derailleur hanger design, tight cog spacing and exact cable tension. The result: the easiest index shifting system to set up and it stays that way. Cage Lock: With this technology in the rear derailleur, wheel removal and installation, as well as chain installation, becomes faster and simpler. Just pushing the cage forward to create slack and lock it into place. Roller Bearing Clutch: Rear derailleurs with the technology deliver maximum drivetrain stability, even through the most punishing terrain. With Roller Bearing Clutch technology, derailleur bounce and chain slap are eliminated without sacrificing precisionBuy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM GX Type 2.1 10 Speed Rear DerailleurThis SRAM GX 10-speed rear mechanism is developed to work with the SRAM 10 speed MTB shifters and a 2x chainring setup. Using a 1:1 cable pull ratio and a rolling bearing clutch this tough component will ensure you have a crisp and precise gear change.Leveraging the legendary history of SRAM shifting, the GX 2x10 rear derailleur provides incredible shifting speed and precision. EXACT ACTUATION technology eliminates chain slackness and shifting variation. ROLLER BEARING CLUTCH technology delivers maximum drivetrain stability-even through the most punishing terrain. And with CAGE LOCK technology, wheel removal and installation are easier than ever.Features: Material: Aluminium Speed: 10-Speed Mount Type: Standard hanger mount Compatibility: Exact Actuation Recommended Group: GX 2x10 Maximum Cassette Low Sprocket Capacity: 36T Shifter Capability: SRAM 10 speed flat bar shifters ONLY Cable Pull Ratio: 1:1 SRAM Part No. RD-GX-T21-A1 Weight: 302gCage Length Information:Short Cage Option: Total chain wrap capacity of 30T (Ideal for use with downhill (DH) / enduro bikes with a smaller chainring up front)Medium Cage Option: Total chain wrap capacity of 35T (Ideal for use with all mountain (AM) / trail bikes with a medium chainring up front)Long Cage Option: Total chain wrap capacity of 47T (ideal for use with touring bikes with a larger chainring up front)Technologies: Exact Actuation - SRAM launched their road technology from scratch, they reapplied their MTB proven SRAM 1:1 actuation ratio (shifter cable travel: derailleur movement) for 10 speed rear shifting. EA helps to simplify/stabilise the uneasy act of balancing rear derailleur hanger design, tight cog spacing and exact cable tension. The result: the easiest index shifting system to set up and it stays that way. Cage Lock: With this technology in the rear derailleur, wheel removal and installation, as well as chain installation, becomes faster and simpler. Just pushing the cage forward to create slack and lock it into place. Roller Bearing Clutch: Rear derailleurs with the technology deliver maximum drivetrain stability, even through the most punishing terrain. With Roller Bearing Clutch technology, derailleur bounce and chain slap are eliminated without sacrificing precisionBuy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM GX 1x11 Speed Rear DerailleurCarefully engineered to bring you consistent and reliable gear shifts when out on the trails, the GX 11-speed rear MTB derailleur is specifically designed for use in a 1x11 drivetrain. It adopts many of the same technologies as seen on SRAM’s top-end XX1 range such as X-Horizon, X-Actuation and the Roller Bearing Clutch system. This means you’ll always have fast and precise shifts and excellent chain retention over the roughest terrain.Features: Material: Aluminium Cage Speed: 11-speed Compatibility: 1x11 SRAM MTB shifters, 11-speed MTB cassettes Mounting: Standard hanger type mount Max Tooth: 42T Pulleys: X-Sync™ Pull: X-Actuation™ Technology Highlights: X-Horizon™, X-Actuation™, X-Sync™, Roller Bearing Clutch™, Cage Lock™ Clutch Type: Yes Suitable for 1x11 drivetrains only Weight: 265g Manufacturer Reference Codes:Black Long Cage: 00.7518.081.000; Red Long Cage: 00.7518.081.001Technologies:Cage Lock™: With this technology in the rear derailleur, wheel removal and installation, as well as chain installation, becomes faster and simpler. Just pushing the cage forward to create slack and lock it into place.Roller Bearing Clutch™: Rear derailleurs with the technology deliver maximum drivetrain stability, even through the most punishing terrain. With Roller Bearing Clutch™ technology, derailleur bounce and chain slap are eliminated without sacrificing precisionX-Actuation™: Developed specifically for SRAM 1X, X-Actuation keeps shifting sharp and consistent across the entyre 10- to 42-tooth cassetteX-Horizon™: The rear derailleur’s ‘straight parallelogram’ design limits all movement to the Horizontal axis, which makes ghost shifting impossible while also reducing shift force. For quicker, more exact shifting, the large upper pulley offset design maintains a constant chain gap across all gearsSRAM X-Sync™: 1X chainrings provide the highest level of performance and durability. The SRAM X-Sync™ tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain. To provide the best possible performance in muddy conditions, the X-Sync™ chainrings have been designed with mud-clearing recesses for the inner chain links and rollers. Engineered in Germany, X-Sync™ rings are an integral part of the SRAM 1X™ drivetrain.Buy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM NX 11sp Rear DerailleurEquipped with many of the same technologies and features seen on SRAM's higher spec XX1 model, this NX 11 speed MTB mech brings you slick shifting you can rely on. It includes the renowned X-SYNC 12T jockey wheels and a larger offset for fast and easy gear changes.SRAM X-Horizon Gear ShiftingBy eliminating unwanted chain movement, X-Horizon shifts faster, puts an end to ghost shifting and reduces shift force and chain slap. And with Cage Lock technology on this mountain bike specific rear mech, wheel removal and installation are easier than ever. Features: Speed: 11 Compatibility: All SRAM 11-speed flat bar shifters Bearings: Steel Cage Size: Long Max Tooth: 42T Mounting: Standard hanger type mount Clutch Type: Yes Technologies: X-Actuation, Cage Lock, Roller Bearing Clutch, X-SYNC X-Horizon design that reduces shift force, ghost shifting and chain slap 12-tooth X-SYNC pulley wheels Fully compatible with all SRAM 1x drivetrains Most affordable fully featured 1x rear derailleur in the industry Manufacturer's Reference Code: 00.7518.092.000 Weight: 322gTechnologies:Cage Lock: With Cage Lock technology in the rear derailleur, wheel removal and installation, as well as chain installation, becomes faster and simpler. Just push the cage forward to create slack and lock it into place.Roller Bearing Clutch: Roller Bearing Clutch rear derailleurs deliver maximum drivetrain stability, even through the most punishing terrain. With Roller Bearing Clutch technology, derailleur bounce and chain slap are eliminated without sacrificing precision.X-Actuation: Developed specifically for SRAM 1x, X-Actuation keeps shifting sharp and consistent across the entyre cassette.X-Horizon: The X-Horizon rear derailleur's ‘straight parallelogram' design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force. For quicker, more exact shifting, the large upper pulley offset design maintains a constant chain gap across all gears.X-SYNC: The SRAM X-SYNC tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp and narrow tooth profile, as well as rounded chamfer edges, helps manage a deflected chain. To provide the best possible performance in muddy conditions, the X-SYNC chain rings have been designed with mud-clearing recesses for the inner chain links and rollers. Engineered in Germany, X-SYNC rings are an integral part of the SRAM 1x drivetrain.Buy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM GX 2x11sp Rear DerailleurThe GX derailleur provides incredible shifting speeds and shifting accuracy that creates a performance level equal to the highest level of SRAM components.Roller Bearing Clutch:The Roller Bearing Clutch provides maximum drivetrain stability, even through the roughest terrain. The consistent performance this clutch creates provides extreme confidence in the bikes shifting capabilities and drivetrain reliability on the most demanding of trail riding situations.Features:Material: Aluminium cageSpeeds: 11-speedCompatibility: 2x11 X-ActuationMax Tooth: 42Weight: 289gTechnologies: Cage Lock: Wheel removal and installation, as well as chain installation, becomes faster and simpler. Just push the cage forward to create slack and lock it into place Roller Bearing Clutch: Maximum drivetrain stability, even through the most punishing terrain. With Roller Bearing Clutch technology, derailleur bounce and chain slap are eliminated without sacrificing precision Exact Actuation: Simplified and stabilised shifting over tight cog spacing found on modern cassettes. By using exact cable tension, the end result is the easiest index shifting system to set up and it stays that wayBuy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM Red 11 Speed Road Rear DerailleurSRAM Red 11 Speed Rear Derailleur has been designed to deliver the performance advantage you have come to expect from SRAM. The derailleur is equipped with SRAM's Exact Actuation technology, which ensures precise and efficient shifting.SRAM have paid special attention to the finer details, like adding a hollow titanium anchor bolt and the use of their AeroGlide pulleys. The result is that the chain runs through the rear derailleur smoother and quieter than ever before.Features: Material: Carbon Cages, Carbon inner links, aero designed Titanium hardware Exact Actuation shifting provides fast, and accurate shifts More clearance with 28t cassettes thanks to a longer B-knuckle Medium cage (WiFLi version) compatible up to 32T cassette New silent shifting with optimised Aeroglide Pulleys with ceramic bearings New spring-fixed barrel adjuster New chain pulley cage adds precise chain management Titanium pinch bolt keeps a low profile while minimising weight Speed: 11-Speed Recommended Group: SRAM Red 11-Speed Weight: 145gTechnologies: AeroGlide Pulleys: New tooth pulley design with a sound damping effect for a super efficient and silent ride experience. Bottom and top pulleys benefit from this feature Exact Actuation: When SRAM launched their road technology from scratch they reapplied their MTB proven SRAM 1:1 actuation ratio (shifter cable travel: derailleur movement). Exact Actuation helps to simplify and stabilise the uneasy act of balancing rear derailleur hanger design, tight cog spacing, and exact cable tension. The result: the easiest index shifting system to set up—and it stays that way WiFLi (medium cage only): SRAM's WiFLi technology accommodates a wider range of gears than a standard short-cage road derailleur. Compared to a triple chainring setup, it provides faster shifts and significant weight savingsBuy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM Red 11 Speed Road Rear DerailleurSRAM Red 11 Speed Rear Derailleur has been designed to deliver the performance advantage you have come to expect from SRAM. The derailleur is equipped with SRAM's Exact Actuation technology, which ensures precise and efficient shifting.SRAM have paid special attention to the finer details, like adding a hollow titanium anchor bolt and the use of their AeroGlide pulleys. The result is that the chain runs through the rear derailleur smoother and quieter than ever before.Features: Material: Carbon Cages, Carbon inner links, aero designed Titanium hardware Exact Actuation shifting provides fast, and accurate shifts More clearance with 28t cassettes thanks to a longer B-knuckle Medium cage (WiFLi version) compatible up to 32T cassette New silent shifting with optimised Aeroglide Pulleys with ceramic bearings New spring-fixed barrel adjuster New chain pulley cage adds precise chain management Titanium pinch bolt keeps a low profile while minimising weight Speed: 11-Speed Recommended Group: SRAM Red 11-Speed Weight: 145gTechnologies: AeroGlide Pulleys: New tooth pulley design with a sound damping effect for a super efficient and silent ride experience. Bottom and top pulleys benefit from this feature Exact Actuation: When SRAM launched their road technology from scratch they reapplied their MTB proven SRAM 1:1 actuation ratio (shifter cable travel: derailleur movement). Exact Actuation helps to simplify and stabilise the uneasy act of balancing rear derailleur hanger design, tight cog spacing, and exact cable tension. The result: the easiest index shifting system to set up—and it stays that way WiFLi (medium cage only): SRAM's WiFLi technology accommodates a wider range of gears than a standard short-cage road derailleur. Compared to a triple chainring setup, it provides faster shifts and significant weight savingsBuy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM Apex 1 11 Speed Rear DerailleurThe SRAM Apex 1 Rear Derailleur brings the simplicity of mountain bike gearing to your Road, Hybrid, Gravel or Cyclocross (CX) bike so you can go where you want. Compatible with up to a 42T cassette, it will help you tackle the toughest terrain and the steepest climbs. Also, thanks to SRAM's Exact Actuation™, X-Horizon™ technologies, you'll enjoy fast, precise and reliable shifting.Features:Material: Aluminium cageCage Length/Type: Long cage fits up to a 42-tooth cogSpeed: 10 or 11-Speed SRAM Road drivetrainsClutch Options: Roller Bearing ClutchIntended Group: Apex 1x11Max Tooth: 42TPull: X-Actuation™Pulleys: Sealed cartridge bearingsCompatibility: Compatible with 10-speed and 11-speed SRAM 1x™ road systemsTechnology Highlights: Cage Lock™, Roller Bearing Clutch™, Exact Actuation™, X-Horizon™, X-Sync™Weight: 314gPart No: RD-APX-1-A1Technologies:Cage Lock™: With Cage Lock™ technology in the rear derailleur, wheel removal and installation—as well as chain installation—becomes faster and simpler. Just push the cage forward to create slack and lock it into place.Roller Bearing Clutch™: SRAM's rear derailleurs with this technology deliver maximum drivetrain stability—even through the most punishing terrain. With Roller Bearing Clutch™ technology, derailleur bounce and chain slap are eliminated without sacrificing precision.Exact Actuation™: When SRAM launched their road technology from scratch, they reapplied their mountain bike (MTB) proven SRAM 1:1 actuation ratio (shifter cable travel: derailleur movement). Exact Actuation™ helps to simplify and stabilise the uneasy act of balancing rear derailleur hanger design, tight cog spacing, and exact cable tension. The result: the easiest index shifting system to set up—and it stays that way.X-Horizon™: This technology gives the rear derailleur a ‘straight parallelogram’ design, which limits all movement to the horizontal axis, making ghost shifting impossible while also reducing shift force. For quicker, more exact shifting, the large upper pulley offset design maintains a constant chain gap across all gears.X-Sync™ Pulleys: SRAM'S 1X X-Sync™ pulleys and chainrings provide the highest level of performance and durability. Their tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. Their sharp and narrow tooth profile, as well as their rounded chamfer edges, help manage a deflected chain. To provide the best possible performance in muddy conditions, the X-Sync™ chainrings have been designed with mud-clearing recesses for the inner chain links and rollers. Engineered in Germany, X-Sync™ rings are an integral part of the SRAM 1X™ drivetrainBuy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM EX1 8 Speed Rear DerailleurSRAM's EX1 8 Speed Rear Mech is a World first, as it's the first rear mech that's specifically designed for E-MTB's. It adopts shift technologies from SRAM's top of the line XX1 and X01 models for the ultimate in quick and accurate shifting and reliable chain retention. It's also been specifically engineered to cope with the extra torque that is generated as you shift through your E-MTB's power assisted drivetrain.Features: Material: Aluminium Cage Speed: 8-Speed Compatibility: SRAM EX1 Max Tooth: 48 Pulleys: X-Sync Pull: X-Actuation Technology Highlights: Cage Lock, Roller Bearing Clutch, X-Actuation, X-Horizon, X-Sync Weight: 289g Technologies: Cage Lock: With Cage Lock technology in the rear derailleur, wheel removal and installation, as well as chain installation, becomes faster and simpler. Just push the cage forward to create slack and lock it into place Roller Bearing Clutch: SRAM's Roller Bearing Clutch rear derailleurs deliver maximum drivetrain stability, even through the most punishing terrain. With Roller Bearing Clutch technology, derailleur bounce and chain slap are eliminated without sacrificing precision X-Actuation: Developed specifically for SRAM 1x, X-Actuation keeps shifting sharp and consistent across the entyre cassette. X-Horizon: The X-Horizon rear derailleur's ‘straight parallelogram' design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force. For quicker, more exact shifting, the large upper pulley offset design maintains a constant chain gap across all gears X-Sync: SRAM's X-sync pulleys and chainrings tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp and narrow tooth profile, as well as rounded chamfer edges, helps manage a deflected chain. To provide the best possible performance in muddy conditions, the X-SYNC chain rings have been designed with mud-clearing recesses for the inner chain links and rollers. Engineered in Germany, X-SYNC rings are an integral part of the SRAM 1x drivetrainBuy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM GX DH 1x X-Horizon Rear MechThe SRAM GX DH 1x X-Horizon Rear Mech brings World championship winning technologies to the masses. Such technologies used to be reserved for SRAM's top-end models, but this is no longer the case. With the GX DH model, you can now use the same drivetrain performance that the pros enjoy at a more affordable price.Fast, Precise and Consistent ShiftingX-Actuation and X-Horizon technologies ensure ghost shifting and random jumps between the cassette cogs are a thing of the past, so you'll fly down the mountain in complete confidence.Features:Material: AluminiumMax Tooth: 28TDrivetrain Speed: 7-Speed onlyWeight: 263gTechnologies:Cage Lock: With Cage Lock technology in the rear derailleur, wheel removal and installation, as well as chain installation, becomes faster and simpler. Just push the cage forward to create slack and lock it into placeRoller Bearing Clutch: The Roller Bearing Clutch delivers maximum drivetrain stability even through the most punishing terrain. This stability benefits the drivetrain dramatically, as derailleur bounce and chain slap are eliminated without sacrificing precisionX-Actuation: Developed specifically for SRAM 1x drivetrains, X-Actuation keeps shifting sharp and consistent across the entire cassette.X-Horizon: The X-Horizon ‘straight parallelogram' design limits all movement on the horizontal axis, which makes ghost shifting impossible while also reducing shift force. The large upper pulley offset design maintains a constant chain gap across all gears and guarantees faster and more exact shifting.X-Sync: The X-Sync pulleys and chainrings tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. To provide the best possible performance in muddy conditions, the X-Sync jockey wheels have been designed with mud-clearing recesses for the inner chain links and rollers. The X-Sync jockey wheels are an integral part of the SRAM 1x drivetrains exceptional performance and efficiency.Buy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
SRAM Force 1 11 Speed Rear DerailleurCyclocross-specific, the Force 1 derailleur brings you the same toughness and slick shifting ability of SRAM’s mountain bike (MTB) range. Designed for 1x11-Speed drivetrains and equipped with fully sealed bearings, it’s ready for the harshest trails.Quiet and Smooth Shifting PerformanceThe internal clutch design eliminates chain slack, making it almost impossible for the chain to fall off the chainring whilst cycling; a real benefit when riding on rough terrain. It also creates a noticeably smoother, quieter and higher performing drivetrain configuration for your bike.Features: Cage Material: Aluminium Pulley/Jockey Wheel Bearings: Steel sealed cartridge bearings Pulley/Jockey Wheel Tooth Count: 12T Speed: 11-Speed Compatibility: SRAM Force and all SRAM drop bar 11-speed shifters Mounting: Standard hanger mount Clutch Type: Yes Cable Pull Ratio: Exact Actuation Maximum Sprocket Size: Short Cage: 26T; Medium Cage: 36T; Long Cage: 42T Manufacturer's Part Number: RD-FRC-1-A2 Weight: Short Cage: 430g; Medium Cage: 434g; Long Cage: 439gTechnologies: Cage Lock: Wheel removal and installation, as well as chain installation, becomes faster and simpler. Just push the cage forward to create slack and lock it into place X-Sync: The X-Sync pulley features a 12-tooth design that helps control the chain’s lateral movement Roller Bearing Clutch: Maximum drivetrain stability even through the most punishing terrain. With Roller Bearing Clutch technology, derailleur bounce and chain slap are eliminated without sacrificing precision Exact Actuation: Simplified and stabilised shifting over tight cog spacing found on modern cassettes. By using exact cable tension, the end result is the easiest index shifting system to set up and it stays that way X-Horizon: The ‘straight parallelogram’ design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force. For quicker, more exact shifting, the large upper pulley offset design maintains a constant chain gap across all gearsBuy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.