Bicycle Mechanics - Q-factor for Ultegra Triple?

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Krispy
03-06-04, 12:27 PM
After doing a search of this forum I've found several discussions about Q-factor. However, I was not able to find a specific answer to what I'm looking for.

Does anybody know the Q-factor of an Ultegra Triple crankset with the 68 x 118 sized splined bottom bracket? None of the LBS in my town have any on the shelf that I can measure and I'd really like to know before I order one.

Also in case anybody can make use of this information the Q-factor for a Shimano XT crankset with the 68 x 113 BB is 175mm . The Q-factor for a Specialzed Strong Arm II crankset with the 68 x 113 BB is 165mm . The Q-factor for an Ultegra Double crankset using the 68 x109 BB is 150mm.

Thanks

sch
03-07-04, 06:37 AM
The crank arms for Ultegra double and triple cranks
are the same, only the cw and bb differ, so Q difference
will come from the BB axle difference. The triple axle
pushes the L crank out 3-5mm more than the double
axle. Steve
Krispy
03-07-04, 02:22 PM
The crank arms for Ultegra double and triple cranks
are the same, only the cw and bb differ, so Q difference
will come from the BB axle difference. The triple axle
pushes the L crank out 3-5mm more than the double
axle. Steve

Thanks

Krispy
01-25-05, 06:02 AM
I thought I'd give an update in the event that someone else might find it useful. I just installed an Ultegra Triple crankset with a 118mm BB. The Q-factor is 157mm.