Interesting. It turns out that the calculations yield numbers very close to what I have been inflating the tires on my bikes with 32mm Paselas for a while now. An item of curiosity: the referenced article from BQ, upon which the calculator is based, has a paragraph that credits Frank Berto for measuring the tire drops of various tire sizes in order to come to his "15%" conclusions. Does anyone know if this is more or less true across the board for all tires of a given size (width) or if it is partial to the more "round" tires - maybe even towards tubulars? My Paselas appear to have a very round cross section, to which I credit their excellent handling. But I used to ride a set of 28mm Avocet Cross II (not to be confused with cyclo- cross) - that actually measured more like 26mm or 27mm when mounted - and the bike's handling experience with them was much worse; difficult, if not impossible under some circumstances, to ride without hands on the bars. I blame this characteristic on the more "elliptical" shape of that tire's cross section whereby a smaller area seems to contact the road.
[by the way, if anyone wants these Avocets I'll ship 'em just for the asking] On Apr 10, 12:25 pm, CycloFiend <[email protected]> wrote: > Hey all - > > For those who are interested in a little non-tax-related spreadsheet work > this weekend... > > Philip Williamson forwarded me the Dave Allen rendered spreadsheet, which > draws on the article in Jan Heine's Bicycle Quarterly magazine for > recommended tire inflation. > > You can now go to the "Files" section of the RBW Owners Bunch on google > groups and download it directly. > > http://groups.google.com/group/rbw-owners-bunch/files?hl=en_US > > File name: tire_pressure_setup.xls > > For some reason, ever since first reading that article, it always gets > "Pressure Drop" rattling around my head... > > http://tinyurl.com/clash-pressuredrop > > http://tinyurl.com/toots-pressuredrop > > http://tinyurl.com/thespecials-pressuredrop > > As with all of these things, YMMV, rider assumes all risk, > don't-call-me-if-you-pinch-flat, yadda-yadda.... Oh! about running lower > pressure, not the songs. > > - Jim > > -- > Jim Edgar > [email protected] > > Cyclofiend Bicycle Photo Galleries -http://www.cyclofiend.com > Current Classics - Cross Bikes > Singlespeed - Working Bikes > > Get your photos posted:http://www.cyclofiend.com/guidelines > > "Maybe a bike, once discarded, pines away year after year for the first hand > that steered it, and as it grows old it dreams, in its bike way, of the > young roads." > > -- Robert McCammon, "Boy's Life" -- 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.
