On Wed, 2012-10-31 at 08:47 -0700, franklyn wrote: > I am afraid that Ian is right. I have measured the circumference of my > wife's 700cx28mm wheel and my 650bx42mm (hetre) wheel using the > rolling test diagramed in user manual of every cyclometer, and here > are the results: > > > 1. 700c wheel with 28mm Clement 28mm tire: 2110mm > 2. 650b wheel with 42mm GB Hetres tire: 2094mm > > > The difference is around 1.5cm. If you currently use 170mm or longer > crank arms, you can switch to a 165mm crankset and mitigate the drop > by 5mm (or a whole 1cm if you use 175mm), but the drop is significant.
So if the circumference is 16mm smaller, the difference in diameter will be 2.55 mm less (dividing the difference by pi); but diameter is not what's significant here, it's radius, i.e., half the diameter, and the difference in radius is 1.2mm -- hardly 'significant'. -- 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-bunch@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.
