Dura Ace Q Factor

chichirider
chichirider Posts: 50
edited August 2012 in Road general
Can you bike techys clear things up with bottom brackets please.

I've just bought a cube litening super hpc sl. Comes with DA FC7900 crankset 53-39 with BB30. Which I am selling by the way although I don't want to turn this question into a sales pitch.
I wan to fit a FSA K force light 50-34 BB30.

Questions, questions;
I know the Q factor on the FSA is 147mm, does this mean the crank shaft may be too short to fit through the frame?
Is the width of the Cube bottom bracket frame the limiting factor?
Should I try to find out the Q factor on the DA 7900, I have tried but haven't quite found it yet.

Many thanks for any advice guys.

Comments

  • schweiz
    schweiz Posts: 1,644
    q factor is the distance between the pedal end of the cranks not the BB end.

    A standard (BSI) road bike BB shell is 68 mm wide so the crank will fit.
    VN BMC Cube SS
    http://app.strava.com/athletes/30000
  • chichirider
    chichirider Posts: 50
    Cheers for that schweiz
    I guess I need to find out what a DA 7900 is to see if fsa is the same.
  • chichirider
    chichirider Posts: 50
    Sorry schweiz its just clicked, the fsa will fit on the 68mm wide frame bottom bracket.
    Cheers.
  • t.m.h.n.e.t
    t.m.h.n.e.t Posts: 2,265
    Isn't doing from DA to FSA a downgrade?
  • rothers_bikeo
    rothers_bikeo Posts: 225
    chichirider wrote:
    I've just bought a cube litening super hpc sl. Comes with DA FC7900 crankset 53-39 with BB30.
    BB30 ? don't think it is. It's a Hollowtech II press fit I'd have thought.
  • BruceG
    BruceG Posts: 347
    You will need to ensure that whatever converter has been used to step the BB30 down to HT2 is removable, thus allowing the frame to go back to a BB30 crankset, why not just keep the DA? Is it just to alter the gearing?

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