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>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, firstname.lastname@example.org, issaquah, wa
94 acura legend gs
80 mazda 626
> >>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.
- Re: Tires
- From: Andrew Duane USG/PE <email@example.com>
- RE: Tires
- From: Psycho Bob <firstname.lastname@example.org>