on 4/30/10 8:08 AM, happyriding at happyrid...@yahoo.com wrote: > I was thinking that as the chainstays got wider, the cassette moved > outboard more, but that isn't true is it? The cassette must be in the > same place no matter how wide the chainstays are? So that meas every > crank has an ideal distance from the BB shell that perfectly lines up > its chain rings with the cassette? So for bikes with wide chain > stays, you need a crank where the crank arms are further away from the > rings so that the crank arms clear the chainstays, but the rings still > line up with the cassette?
Yep. Pretty much. The idea is to design a bike which allows you to place the chainrings and rear sprockets in similar relationship to the centerline of the bicycle. AASHTA - http://sheldonbrown.com/chainline.html It's not so much that the chainstays were widened - the rear spacing doesn't really change as it's specific to the gearing. http://www.sheldonbrown.com/frame-spacing.html A few things have led to wider crank arm "splay" - shorter chainstays, which move the wider part of the rear triangle closer to the bottom bracket; larger diamter (i.e aluminum) and/or square tubing found on mtb designs; suspension designs which favor oversized or square tubing. - J -- Jim Edgar cyclofi...@earthlink.net 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 rbw-owners-bu...@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
