Octalink to Hollowtech

DC Ayr
DC Ayr Posts: 33
edited April 2009 in Workshop
I am going to replace an Octalink (105 triple) chainset with a Hollowtech (Ultegra double) chainset. Seems pretty straightforward but.....
the Hollowtech is from a bike with a 68mm BB housing and the Octalink is on a bike with a 74mm BB housing. Is this a problem - will I need new cups - or is it as easy as I originally hoped?

Anyone done a similar swap?

Comments

  • DC Ayr
    DC Ayr Posts: 33
    It's a Hollowtech 2
  • Wappygixer
    Wappygixer Posts: 1,396
    I know that mtb hollowtwch 2's fit both 68 and 73mm bottom bracket shells and I'd imagine that the road bottom brackets are the same style to
  • whyamihere
    whyamihere Posts: 7,708
    You can't fit road HTII cranks to a 73mm BB, at all. Sorry.
  • DC Ayr
    DC Ayr Posts: 33
    Thanks for the info whyami - you have just saved me from b*ggering up two bikes :shock:
  • DC Ayr
    DC Ayr Posts: 33
    ..................but then again, if the MTB version will fit both (thanks Wappy) I might just have a go. It's all to do with the spacers - what could possibly go wrong :lol:
  • John.T
    John.T Posts: 3,698
    I think the axle will be too short on the 105 HT2 68mm crank set. The spacers are only used on the MTB sets for different chain lines and Bbwidths.
  • whyamihere
    whyamihere Posts: 7,708
    John.T wrote:
    I think the axle will be too short on the 105 HT2 68mm crank set. The spacers are only used on the MTB sets for different chain lines and Bbwidths.
    Yep. The axle is 5mm shorter on road sets.