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*To*: "'quattro@coimbra.ans.net'" <quattro@coimbra.ans.net>, "'jackr@internet.kronos.com'" <jackr@internet.kronos.com>*Subject*: RE: Tires*From*: Peter Henriksen <peterhe@microsoft.com>*Date*: Wed, 10 Jul 1996 09:44:43 -0700*Encoding*: 36 TEXT*Sender*: owner-quattro@coimbra.ans.net

>From my calculations (read: YMMV :-): Tire size Total diameter Rollout Change from stock 205/55 631.9mm 1985.1mm N/A 215/50 621.4mm 1952.1mm 1.7% 225/45 608.9mm 1912.9mm 3.6% Formula being: ((2*((<profile>/100)*<width>))+(<wheel size>*25.4)) to get a result in milimeters for the diameter and then 2*pi*r to get the rollout (pi somewhat equal to 3.1415). Did I just do something stupid or is that right? It's still pretty early, I haven't had nearly enough coffee and I haven't done anything like this since college... On that note, how much of a difference is generally acceptable in rollout before the speedometer and odometer start getting way off? Where do you go to get the instruments recalibrated? - peter henriksen, peterhe@microsoft.com, issaquah, wa 91 200qw 94 acura legend gs 80 mazda 626 >---------- >From: jackr@internet.kronos.com[SMTP:jackr@internet.kronos.com] >[snip] > >>One question. Has anyone put new tires on yet? I am planning on > >>putting 225/50 R16 Dunlop D40M2's this week. They have the same > >>circumference as the 205/55's and supposedly enough clearance. Has > >>anyone heard differently? > > My understanding of tires is that a 215/50 or 225/45 would have the > same circumference as a 205/55. >

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