I couldn't be bothered to do any research at all and just used 600mm as the tire height. (Are your students this lazy Igor?)
Race slicks are normally sold as being overall width by overall height by rim size. I'm used to seeing it expressed in mm x mm x inch, but the figures there are about right if you use cm, i.e. front = 33cm wide x 68cm tall on an 18" rim and rear = 37cm wide x 71cm tall on an 18" rim. A 71cm tall tire gives a better result, assuming of course that the 100mph speed was close. Even then a 10% difference one way or another won't make that much difference. Paul On 26/12/2010, at 4:26 AM, Doug Franklin wrote: > On 2010-12-25 11:59, Igor Roshchin wrote: > >> I think Paul gave the right explanation, or at least that the >> explanation I head the moment I read the answer. > > Yep, the more I've thought about it the more I think Paul was right, too. > >> I should note that a similar effect can be expected when the tire makes >> not about 1/15th of a turn, but also 2/15th, 3/15th, etc. (N/15), >> but the contrast will be lower, and it probably wouldn't work beyond >> N=3 (or maybe even 2, depending on the light conditions). > > Yeah, that's part of the moire effect. Many integral multiples/fractions > will give related effects. > >> I found the tire size, but I was not able to decipher it: >> http://en.wikipedia.org/wiki/Audi_R10_TDI >> * Front: 33/68-18. >> * Rear: 37/71-18. >> I understand that the rims are 18". >> What's the first (and the second) number(s)? >> >> The only sense I can guess is if the first two numbers were in cm. > > I think the first number is the width of the tread in centimeters, since that > works out to around 13". The 68 and 71 I'm not sure about, but they're > definitely not aspects for the sidewall height, as you noted. > > -- > Thanks, > DougF (KG4LMZ) > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
