Join Date: Jun 2006
Bikes: 03 Raleigh Professional (steel)
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Q doesn't have much to do with clearance. Q is simply the distance between the pedals. The distance may not be (and often isn't) symmetrical.
Since you (apparently) have the crankset, just measure the distance from the centerline of the BB to the innermost part of the pedal on each side. The drive side will be most likely to hit a chainstay.
Stupidity got us into this mess - why can't it get us out?
- Will Rogers