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Bottom Bracket and Crank Standards are often a source of mass confusion. So let's jump in and figure out what's going on down there! Bottom Bracket or BB as they are commonly known, refers to the bearing system that your cranks spin on.
By BikeRadar. This comprehensive guide tells you everything you need to know about bottom brackets — from a breakdown of all the bottom bracket systems available and their compatibility with one another to how a bottom bracket works and how to stop a bottom bracket creaking, this guide has it all. Below we rundown each of the major bottom bracket systems currently available, along with advantages, disadvantages, notes on compatibility, and some input from their proponents on why they exist:.
Your bottom bracket is housed in the bottom bracket shell of your bike frameit connects your chainset to the frame and allows the cranks to turn smoothly. When selecting a replacement bike bottom bracket you need to make sure that you get the correct model. This guide will help you get the right one to fit your bike and also your pocket.
The evolution of road bikes may have provided cyclists with frames that are lighter, stiffer and more aerodynamic, but there has also been a substantial increase in the number of bottom bracket and crank axle designs. The once ubiquitous threaded bottom bracket shell has given way to larger threadless designs while the diameter of crank axles has also grown. Both may have helped elevate the performance of contemporary road bikes but consumers have been left to contend with myriad options and some frustrating incompatibilities.
Complete bottom bracket assembly for XT M speed crankset; includes left and right hand cups, spacers, inner cover, and inner O-rings. Coupons can not be combined with promotional gift certificates, however, purchased gift certificates may be used with the coupons. If you would like to use your coupon with a purchased gift certificate, please leave the gift certificate information in the comments section at checkout, and they will be applied during processing on the backend.
The long-awaited Shimano XT 11 speed drivetrain has made its grand entrance! The new Shimano XT Cranks are beautifully forged out of aluminum and turn on an updated bottom bracket that reduces both the weight and bearing drag, while improving its performance in muddy conditions. Through Shimano's proven Hollowtech ll technology, the XT M Crankarms receive a shot of stiffness and more weight savings.
This article will assist in identifying the crank system found on your bike, and direct you to the article that outlines the full process of removal and installation. Cranks are levers that connect the pedals to the bottom bracket spindle. The cranks are fitted with toothed sprockets called chainrings that drive the chain.