Shimano BR-R451 Rear Mid-Reach Road Caliper Silver MFPN=Y1XK98010 5mm 11-Speed 52/36t 110 BCD

5mm 11-Speed 52/36t 110 BCD BB30/PF30 Spindle Interface Black

Ring Position/Type Chain Retaining Single Ring Tooth Count 34 Round or Oval Round Drivetrain Speeds 12 Chainline/Hub Compatibility 135/142 MTB Hubs Chainline/Hub Compatibility 141/148 Boost Hubs Material Aluminum Defined Color Black Direct Mount Type Direct Mount CINCH

Built for performance and All Day Comfort

14mm 4130 chromoly axle bolts with 17mm 4130 chromoly female axle

Color Silver Range 11-40 Cassette Cogs 11-13-15-18-21-24-28-34-40 Cassette Body Type Shimano/SRAM 8 9 10 Speed Drivetrain Speeds 9 Defined Color Silver

Shimano BR-R451 Rear Mid-Reach Road Caliper Silver MFPN=Y1XK98010 5mm 11-Speed 52/36t 110 BCDShimano BR R451 Rear Mid Reach Road Caliper Silver. Shimano BR R451 Road Brake CalipersCompatible with STI and brake levers that are Super SLR enabled (e. g. Dura Ace Di2 7970 Dura Ace 7900 Ultegra Di2 6770 Ultegra 6700 105 5700 Tiagra 4600) Light action and accurate brake power Adjustable toe in brake shoes Use of these calipers with standard SLR enabled STI and brake levers results in a "mushy" brake response TECH SPECS Brake Lever Actuation Short