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Hairy green toads from Mars made Peter Henriksen say:
> >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
> >From: firstname.lastname@example.org[SMTP:email@example.com]
> > >>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.
The original question was correct, as is Peter. Jack is not quite right:
# tire_size 205/55/16 215/50/16 225/50/16 225/45/16
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
205/55-16 4.4in 12.4in 24.9in 78.2in 811 0.0%
215/50-16 4.2in 12.2in 24.5in 76.9in 824 -1.7%
225/50-16 4.4in 12.4in 24.9in 78.1in 811 -0.1%
225/45-16 4.0in 12.0in 24.0in 75.3in 841 -3.6%
Andrew L. Duane (JOT-7) firstname.lastname@example.org
Digital Equipment Corporation (603)-881-1294
110 Spit Brook Road
Nashua, NH 03062-2698
Only my cat shares my opinions, and she's too heavy to care.
- RE: Tires
- From: Peter Henriksen <email@example.com>