Shimano105 CS-R7100 12-Speed Cassette(Return to Product Page)

I bought the 11-36 version to use on my 8100 ultegra bike for a sub 1:1 climbing ratio. This is technically out of spec for the ultegra rear mech, but after a small b screw adjustment it is working without any issue. The ultegra cage is shorter, so maybe chain wrap could be an issue, but using the auto shift function prevents any extreme cross gears where chain length might be a concern. This 105 cassette does not have the HG+ teeth profile, but I honestly cannot tell any difference compared to my ultegra cassette while riding.

I was updating my bike to Di2 Gearing with Ultegra components. The Shimano folks say that their rear derraileur Won�t handle an 11�36 cassette, so I went and search of one, and found that the 105 series has one. Course, bike tires Direct had it in stock, and it works just fine.