on 9/26/10 9:45 PM, andrew hill at [email protected] wrote: > So.. when starting to build my new (to me) Romulus.. what size bb might folks > suggest to get a nice wide Q?
You have to watch it a bit there - simply swapping in a bottom bracket with a longer spindle will change your chainline. It could move it outboard enough to affect shifting. Spindle length and tread/Q are two separate things. http://sheldonbrown.com/chainline.html http://www.sheldonbrown.com/bridgestone/1991/pages/bridgestone-1991-13.htm http://www.rivbike.com/article/components/cranks To grossly overstate, most cranks currently available are wide or wider tread - reacting to the trend towards shorter chainstays of larger diameter. (MTB cranks seem to be the widest.) This allows the arms to clear the chainstays, which is generally a very good thing, but does move your feet wider, which may not be. They change the angle or outward placement of the arms, but also place the rings where they need to be for proper chainline. The generally accepted wisdom is that tread/Q should be narrow, but what defines narrow to me may not work for you. Hip width, knees and ankle angles and all sorts of stuff come into play. Some folks get on a wide set pair of cranks and go "Aaaaaahhhhhh!" while others certainly don't. - J -- Jim Edgar [email protected] Cyclofiend Bicycle Photo Galleries - http://www.cyclofiend.com Current Classics - Cross Bikes Singlespeed - Working Bikes "You must be the change you want to see in the world." Mahatma Gandhi -- 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.
