Viewing 7 posts - 1 through 7 (of 7 total)
  • Quick bottom bracket question – Shimano cup size/tool changed?
  • Premier Icon midlifecrashes
    Full Member

    Narrowed down the noise to the BB (I think), it’s a SM-BB70, old model XT?

    Looking at current XT, MT800, the cups look smaller overall. Is the tool the same? If not, is it worth changing to new standard or should I buy a third party version from Uberbike or somebody?

    Premier Icon tjagain
    Full Member

    it is a different size but when I bought a new BB I got the adapter with it to fit the old tool to the new cups

    Premier Icon wheelsonfire1
    Full Member

    As above, the later road and MTB higher end bottom brackets are supplied with a plastic adapter that fits inside the original tool – if from a reputable dealer!

    Premier Icon bigyan
    Free Member

    Shimano now have 3 “standard” hollow tech BB cup sizes;

    16 notch 44mm Older hollowtech
    16 notch 41mm “New” Ultegra 6800, MT-800
    16 notch 39mm “New” XTR, Dura Ace

    Some of them also fit mid drive lockrings, some STEPS etc

    Its annoying.

    Premier Icon Tim
    Free Member

    You get an adaptor with them so it doesn’t really matter

    Premier Icon kerley
    Free Member

    Watch out if you are hamfisted and the bottom bracket is very tight in the frame as they are made of plastic and can split. Yes I am hamfisted.

    Premier Icon coynie09
    Free Member

    Was looking for a bottom bracket myself a couple of weeks back looked at the XT 8000 but most didn’t supply the adaptor you had to buy separate (£5 for a piece of plastic) so just got one from Uberbike & you can replace the bearings…

Viewing 7 posts - 1 through 7 (of 7 total)

You must be logged in to reply to this topic.