CeramicSpeed Pulley Wheels Shimano 11-Speed - 12 Tooth Narrow Wide Alloy BLK CheckoutSpec= Recon (2010) They are compatible with mountain

They are compatible with mountain and road bike handlebars thanks to an expanding wedge that makes a secure fit for most inner bar diameters

A powerful canti-brake ideally suited for load touring or cyclocross and the low-profile design helps solve heel clearance issues on smaller frames

This is ideal for elite skiers who are skiing for prolonged periods of time

Seals porous tires and bead/rim gaps

New extra long 27cm hex key and second ball-end deliver leverage and speed

CeramicSpeed Pulley Wheels Shimano 11-Speed - 12 Tooth Narrow Wide Alloy BLK CheckoutSpec= Recon (2010) They are compatible with mountainCeramicSpeed pulley wheels reduce friction last 3 5 time longer than stock high end pulleys and are designed to work with less drag. Premium Grade 3 Silicon Nitride Ceramic balls Hand built in Denmark Drivetrain Speeds 11 Fits Brand Shimano