On Sat, Sep 25, 2010 at 2:34 PM, Kathryn Hall <[email protected]> wrote: > I'm sure you know this, but to summarize, tread depends on model of crank > and bottom bracket width, which in turn is dependent on clearance at the > chain stays. What I can say from my experience is that the narrowest tread > can be had with a TA Pro 5 Vis or VO Grand Cru crank providing the chain > stays allow a narrow bottom bracket. If you want a wider Q factor, you only > need insert a wider bb.
And far more on crank design, that is, how much the arms flare. My XD2, as above, has a 160 mm Q with a 113 mm bb; I ran a Cyclotourist on a custom 145 mm bb: it had the same Q, 160. The same TA with a 113 bb gives a Q of 130 - 135 mm. Note, though, that putting a given crank on a wider bb spindle might make the chainline a bit off -- though where "off" becomes "untenable" will differ from situation to situation. I salvaged the TA's chainline with the 145 mm Phil by running the 44 t outer ring in middle position with a 30 t inner for a wide range double. -- Patrick Moore Albuquerque, NM For professional resumes, contact Patrick Moore, ACRW at [email protected] -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
