Mojoman Posted January 20, 2022 Posted January 20, 2022 I have those Shimano hollow tech cranks, I usually use a BB-51 but cant find one... I found a BB-52 at a bike shop and bought this.... Shop has now told me they dont have the BB52 but are sending me the Ultegra BB.... They say its the same fit and uses the same tool.. Can anyone confirm this please? I dont want to wait a week for my delivery only to find the crank wont fit...
Martin PJ Posted January 20, 2022 Posted January 20, 2022 Ultegra is for 68 mm shell and MTB for 68 or 72 mm. I don't think you can use Ultegra on MTB. The BB cup threads are fewer on the Ultegra as the BB52 is designed to be used with spacers (if required), also the plastic tube which stops water getting into the bearings is too short to join the two BB cups if you fit Ultegra to MTB.
Mojoman Posted January 20, 2022 Author Posted January 20, 2022 Thanks, Im also seeing that it appears the threaded section is shorter? I specifically asked this shop if they had stock of the BB52 before I made payment... 😒
Mojoman Posted January 20, 2022 Author Posted January 20, 2022 Products Grades Weights Formulas Supported Shell Widths BB-R9100 DURA-ACE 65g Threaded 68mm、70mm SM-BBR60 ULTEGRA/105 77g Threaded 68mm、70mm BB-RS500 TIAGRA 92g Threaded 68mm、70mm SM-BB93 XTR 73g Threaded 68mm、73mm SM-BB80 SAINT 95g Threaded 68mm、73mm、83mm BB-MT800 DEORE XT 95g Threaded 68mm、73mm SM-BB52 - - Threaded 68mm、73mm
Mojoman Posted January 24, 2022 Author Posted January 24, 2022 (edited) Confirmed with 10 minutes of spannering about... the Ultegra WILL NOT fit on a MTB..... 🤬 Edited January 24, 2022 by Mojoman
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