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Shimano splined spindles?(4 posts)

Shimano splined spindles?SS_MB-7
Apr 15, 2002 7:23 AM
I'm building a fixed-gear/singlespeed 'cross bike that requires a front chainline of ~53.0mm. I'm using a Phil Wood rear flip-flop fixed-free hub. I'm likely going to be using a Dura-Ace (or Ultegra) crank and Shimano splined BB.

The specs for the Dura-Ace road crank/BB are a 43.5mm chainline (measured between the rings) with a 109.5mm BB. The measurement to the outer-ring is 47.5mm. Since I need 53.0mm, I'll need to move the crank out 5.5mm. Assuming a symmetrical BB, this would be a spindle length of: 109.5 + 2 * 5.5 = 120.5mm. Unfortunately, the longest splined Shimano BB is 118.0mm (for road triples). But, in the pics I have seen of this BB (see below), the spindle does not appear to be symmetrical. Unfortunately, I need to know what this asymmetry is to ensure that I have the correct chainline. What about the XTR BB spindles (112.5mm and 116mm)?



Ride Hard,
Mike B.
More questions - no answers.Spoke Wrench
Apr 16, 2002 6:36 AM
Where did you get your chain line numbers from? It doesn't make logical sense to me that a stock bottom bracket would provide an adequate chain line for a 9-speed cassette with 130mm drop out spacing but be too short for a single speed with 110mm drop outs.
Agree!grzy
Apr 16, 2002 7:51 AM
Any way you can bolt things up with existing components and measure the chain line with a Park Chain Line Gauge? The XTR BB offers you the ability to move it laterally - once you get the correct length you should be fine.
I'm using 135mm rear spacing, not 110mm....SS_MB-7
Apr 30, 2002 8:50 AM
Sorry, I thought I mentioned that I'm using a 135mm rear hub, not 110mm. But, in looking at my original post, this was not the case....sorry. At any rate, I mounted a freewheel and a track cog on the both sides of the flip-flop hub and accurately measured the chainline to be ~53.0mm.

Ride Hard,
M.