I'd like a copy as well. Seeing as there are two scales in my house, I can actually get on the bike with one under each wheel and get a good assessment. Being heavy, I've always pumped my tires to the max on the tire's sidewall, but now that I'm riding wider tires, I wonder if that is the right thing to do.
René On Thu, Apr 8, 2010 at 6:05 PM, Bill Gibson <bill.bgib...@gmail.com> wrote: > I'm curious about the spreadsheet, too. Send it on! > > One of the lessons from testing tires was that the exact right > pressure is not that important on bikes. It does seem to matter on > automobile/truck tires, ruining gas mileage and overheating the tire > causing spectacular explosions at highway speed, etc. I used to be > very careful to inflate to the exact pressure marked on the tire > before every ride, using a really accurate tire gauge, and now I don't > worry so long as it feels OK. > > I went to Ikea and got two really cheap bathroom scales to measure the > weight distribution of my bikes (and for other projects), that's the > kind of geek I am... > > On Thu, Apr 8, 2010 at 3:54 PM, Philip Williamson > <philip.william...@gmail.com> wrote: > > A fellow named Dave Adams derived a formula that approximates Frank > > Berto's measured tire drop, and made an Excel file that uses it. > > He's given me permission to pass the xls file on, if anyone besides > > David wants it. > > > > You input your weight + gear, your tire size, and the percent of bike > > weight on the rear wheel. > > It gives you recommended pressures for front and rear tires. > > > > My sample of two (Quickbeam and low-trail Ross) showed that the BQ > > figures for "normal" and "low-trail" rear/front weight distributions > > were spot-on: 60/40 and 55/45 respectively, so the only difficulty > > would be wrestling your loaded bike into the bathroom to stand on the > > scale with it! > > > > So if you want to play with the file, let me know. > > Philip > > > > > > On Apr 7, 10:13 pm, jan_heine <hein...@earthlink.net> wrote: > >> > Jan: would it be possible to develop an app that calculated > recommended > >> > tire pressure based on weight & tire size similar to the chart you > >> > previously ran? That would be a wonderful tool to have on the > website. > >> > >> The chart is available online (see our samples page)... > >> > >> http://www.vintagebicyclepress.com/samples.html > >> > >> Somebody could develop an app for it, I am sure. (Don't ask me - I > >> already spend 50-65 hours a week putting together the next BQ...) > >> > >> However, the chart is only a starting point anyhow, and the hard part > >> is measuring how much weight you have on each wheel. Once you have > >> that value, going to the chart and figuring out the correct pressure > >> for your tire is the easy part. > >> > >> Jan Heine > >> Editor > >> Bicycle Quarterly > >> 2116 Western Ave. > >> Seattle WA 98121http://www.vintagebicyclepress.com > > > > -- > > 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<rbw-owners-bunch%2bunsubscr...@googlegroups.com> > . > > For more options, visit this group at > http://groups.google.com/group/rbw-owners-bunch?hl=en. > > > > > > > > -- > Bill Gibson > Tempe, Arizona, USA > > -- > 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<rbw-owners-bunch%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/rbw-owners-bunch?hl=en. > > -- 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.
