5 common Shimano compatibility mistakes (and how to avoid them)

1. Mixing 11-speed and 12-speed cassettes

The classic mistake. Shimano 12-speed cassettes require a Micro Spline freehub body, incompatible with standard HG.

The rule: always check freehub body / cassette compatibility.

2. Wrong bottom bracket standard

BSA, Press-Fit BB92, BB86, T47... A Shimano crankset can fit multiple standards, but not with the same bottom bracket.

The rule: identify the frame standard BEFORE ordering.

3. Rear derailleur cage length

A GS (medium cage) derailleur doesn't handle the same range as an SGS (long cage).

The rule: check the total capacity of the derailleur.

4. Brake/lever compatibility

Shimano changed the lever ratio between series. A BL-M8100 lever isn't optimised for an older generation calliper.

The rule: lever and calliper from the same series.

5. Centre Lock vs 6-bolt discs

The rule: check the hub standard before ordering discs.

How L'Atelier helps

The assistant answers with the exact source from the dealer's manual.