Thanks Benz. On Sat, Jul 18, 2020 at 4:19 PM Benz Ouyang, Sunnyvale, CA < benzouy...@gmail.com> wrote:
> On Saturday, July 18, 2020 at 1:00:50 PM UTC-7, Ted Durant wrote: > > >> The old Avocet Cyclometer prescribed method: Set the front wheel so the >> valve stem is at the very bottom and mark a line on the ground at the >> center of the tire contact patch, where the valve stem is. Ride the bike >> forward in a straight line one revolution of the front wheel, and mark >> another line where the center of the contact patch (and the valve stem) now >> are. Measure the distance between the two marks. Divide that distance by >> 2*Pi, and that's your radius. (For more accuracy, repeat that measurement >> several times and take the average.). It's possible to put a chalk line on >> your tire and do this yourself, without help. >> > > A trick to Ted's method is to mark the tire with a thin line of chalk, so > the ground will be marked by the chalk as the tire rolls over the mark. > Also, your error will be lower if you do two or more revolutions of the > wheel instead of one, and lower the tire pressure such that it approximates > the sidewall droop when a nominal load is applied, but that's bordering on > OCD. > > -- > You received this message because you are subscribed to a topic in the > Google Groups "RBW Owners Bunch" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/rbw-owners-bunch/Olzu96ue1o8/unsubscribe > . > To unsubscribe from this group and all its topics, send an email to > rbw-owners-bunch+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rbw-owners-bunch/db21ebaf-46b0-4578-8058-68344abf4e8bo%40googlegroups.com > <https://groups.google.com/d/msgid/rbw-owners-bunch/db21ebaf-46b0-4578-8058-68344abf4e8bo%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- ~IMPORTANT~ Note to all~~ EMAIL ETIQUETTE If you forward this email, please highlight and delete the forwarding history, which includes my email address and maybe others. It is a courtesy to me and others who may not wish to have their email addresses sent all over the world. Erasing the history helps prevent Spammers from obtaining addresses, prevents viruses from being propagated, and limits the proliferation of spam. Also, please use the “BCC” area instead of “TO” and “CC” when forwarding to several people at once. ~~Thank you~~ -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/CAPjfky8%2BU%3Dy_o0tBqxsr9MoxtG8Q85bRSTB9JsVqN8rG10HXBw%40mail.gmail.com.
