Hollowtech II bottoms bracket compatibility question

clanton
clanton Posts: 1,289
edited May 2011 in MTB workshop & tech
Probably a stupid question but I'm desperate - does anyone know if the hollowtech II bb's are interchangeable - specifically would a Shimano XT hollowtech II bb work with a Shimano 105 (road) chainset/bb shell?

Comments

  • turnerjohn
    turnerjohn Posts: 1,069
    yes...although they may not last was long. Its the same 24mm axle (25mm bearing with 1mm inserts)
    its the spacing / width that sometimes different. easy way is to remove the plastic spacer that way their fit.
    I'm running a road BB on my MTB as that was all I had to hand and its been fine....so much so I left it there ! (may not last as long tho)
  • nicklouse
    nicklouse Posts: 50,673
    the only difference is the length of the threads on the drive side cup on a MTB version.

    just fit as per the crank instructions.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • londoncommuter
    londoncommuter Posts: 1,550
    Not quite your question but I replaced a Tiagra BB with an Ultegra one with no ill affects.
  • maddog 2
    maddog 2 Posts: 8,114
    see my reply in the road section for a bit more detail on this. :wink:
    Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer

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