What bottom bracket does ultegra use?

SM-BBR60
Ultegra SM-BBR60 Bottom Bracket.

What is octalink bottom bracket?

Octalink Bottom Brackets. This system, designed by Shimano, was the first successful alternative to the older square taper. The Octalink system uses a larger and stiffer spindle with eight splines. The splines provide a greater contact area between crank and spindle for a stiffer interface.

What bottom bracket do I need?

To find out the size of bottom bracket needed, measure the inside of the bottom bracket shell in your frame, it will be 73mm, 70mm or 68mm. Some older frames may have Italian threaded bottom brackets, instead of the more modern English.

What is the difference between English and Italian bottom bracket?

The key difference is in how the two thread into the bottom bracket shell. Like pedals, one side of a BSA standard bottom bracket shell is reverse (left) threaded, while both sides of an Italian standard bottom bracket shell are regularly (right) threaded.

Is octalink better than square taper?

The octalink is most likely stiffer than square taper, bringing more sense or feel of power transfer and traction. Generally smaller rings for sit and spin, bigger rings for stand and mash. The common 22, 32, 44 triple rings cover both styles of riding well.

Is Isis the same as octalink?

Octalink lasts a lot longer because of their application of bearings, but Isis should provide better power transfer because it has more splines. And since it also has more splines, the actual interface between the BB and the crank should also be stronger.

Is octalink and Isis the same?

What does BC1 37×24 mean?

‘BC1. 37×24 ROAD’ Means an ISO/’English’ threaded bottom bracket shell, 68mm wide is the road standard width. Shimano external threaded BB cups thread right into that, and all 24mm axle road cranks go right in.

How do I know my bottom bracket size?

Is octalink any good?

Octalink and ISIS splines work very well in terms of securing crank arms, and tend to be cheaper to boot. In my mind, if you can get a good deal on something, run with it, rather than worrying about what you have or what to get.

Why is hollowtech better than square taper?

Hollowtech is a bit stiffer and easier to take apart, but square taper will last much longer.

What is Isis drive crank?

ISIS Drive, the International Splined Interface Standard, is a non-proprietary splined specification for the interface between a bicycle crankset and the bottom bracket spindle. It was created by King Cycle Group, Truvativ, and Race Face. ISIS Drive is open source and free to the public to be used as seen fit.

What is Isis crank?

ISIS cranks, a special type of splined crank, have become the standard for unicycle crank arms for their strength and reliability.