Actual manufacturer's revs per mile specs are best but the calculator on this page is much more useful than the one at miata.net - http://brickwerks.hostinguk.com/VehicleSpecific/T3/info/mods/alloys/altwhls.htm On Tue, Mar 16, 2010 at 12:39 PM, Mike S <mikes@flatsurface.com> wrote: > At 02:26 PM 3/16/2010, John Bange wrote... > >> > I am wanting to know what the revs per mile of the Michelin >> Agilles >205/65R15 C is >> >> I use this calculator: >> >> http://www.miata.net/garage/tirecalc.html >> > > That calculator is way off with regard to rev/mile. It might be useful > in comparing two different sizes, but not actual tires, since the only > measurement of a real tire which can be expected to be exact is rim > diameter. A tire with a section width of 210 may be called a 215, > because 210 isn't a standard size. > > The problem with that calculator, and others I've seen, is that it > figures diameter mathematically, assuming perfect circles, etc. A real > world tire has a rolling radius which is smaller than that of a tire > represented as a perfect circle (it compresses when loaded), which > means it will turn faster. > > So where that calculator says a 215/60R16 does 771 revs/mile, Falken > says their ZE-912 of the same size does 808. That's about a 5% > difference. >
-- Jake 1984 Vanagon GL 1986 Westy Weekender "Dixie" Crescent Beach, BC www.thebassspa.com www.crescentbeachguitar.com http://subyjake.googlepages.com/mydixiedarlin%27 |
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