Shimano BR-R451 Rear Mid-Reach Road Caliper Silver MFPN=Y1XK98010 Color Black Chainring BCD 110

Color Black Chainring BCD 110

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

0 Color Gold Material Aluminum Defined Color Gold S

The top cap on these headsets have unique raised features that key to Knock Block compatible stems (made by Bontrager

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

Shimano BR-R451 Rear Mid-Reach Road Caliper Silver MFPN=Y1XK98010 Color Black Chainring BCD 110Shimano 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