Info from another Canuck, (we're everywhere!) A couple of years back I was running 18s and Kramers were running 19.5s. The following year at Nationals I ran 19.5s (because Ed and Gary ran them) and they were running 18 because I had scared them - we had a good laugh at Nationals. I am not good enough to notice any difference. I even run the 6.5s on the front and 7.5s on the rear - 54.75" wide. If you do not gear the car for almost as low as you can get, you may notice an accelleration difference with the 18"
> We Canadians are part of vast international conspiracy, orchastrated by > the > SCCA, to kill off F500 by moving all cars north of the boarder...or > perhaps > the Rotax engines feel more at home in the great white north... > > I don't have a definitive answer to the tire size question since I've > always > run 19.5's on the Mk V, but your description matches my understanding. > With > our very limited suspension, the spring rate and deflection of the tires > is > important. Hoosier provides some data on 10" tires for FSAE cars (same > tires we use) and it shows that the spring rate of the 18 is slighly > higher > than the 19.5, especially at lighter loads, and that the 19.5 also > deflects > a bit more. See https://www.hoosiertire.com/spring.htm for data. > > I suspect that the 18 may offer the potential for faster runs in autox due > to crisper transitional response, but the 19.5 is likely easier to drive > closer to the (slightly lower) limit consistantly. > > All that said, many of the fastest drivers in autox use the 18 and Hoosier > Tom suggested that it is probably the better tire for solo...someday I > hope > have some spare tire budget to test the theories. > > Sheldon > > On 4/29/07, John Vriesinga <[EMAIL PROTECTED]> wrote: >> >> What's this? Yet another Canuck? >> >> That would make 3 or 4! >> >> Anyways, with regard to the tire question what I overheard yesterday, >> from >> someone who should know (I sure don't) is that they are more squirrelly >> than >> the bigger tire. The taller sidewall makes the bigger tire more >> forgiving >> than the shorter one, is what he said, complaining bitterly about >> getting >> beaten round the track by his daughter. >> >> YMMV >> >> JV > ________________________________ > FormulaCar Magazine - A Proud Supporter of Formula 500 > The Official Publication of Junior Formula Car Racing > Subscribe Today! www.formulacarmag.com or 519-624-2003 > _________________________________ ________________________________ FormulaCar Magazine - A Proud Supporter of Formula 500 The Official Publication of Junior Formula Car Racing Subscribe Today! www.formulacarmag.com or 519-624-2003 _________________________________ _______________________________________________ F500 mailing list - [email protected] To unsubscribe or change options please visit: http://f500.org/mailman/listinfo/f500 *** Please, DO NOT send unsubscribe requests to the mailing list! ***
