Hairy green toads from Mars made Benjawan Kuecharoenwong say:
> I read in Complete Car4 Mag. that one Opel 4X4 owner
> just change the
> rear tyres (with the same size with the fronts) ,after that the
> transmission gone (because of slightly differrence in radius between
> front tyres and rear tyres.
> My car's tyres are 235/45-17 ,but the spare is 215/60-15 .
> Is it safe to use this spare tyre (for emergency only) ?
> or I have to buy one set of 17" wheel to be a spare.
According to Mark Sirota's tire_size program:
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
235/45-17 4.2in 12.7in 25.3in 79.6in 796 0.0%
215/60-15 5.1in 12.6in 25.2in 79.0in 802 -0.7%
So, the spare has just about the same rolling circumference as the
regular tire; it should be OK.
If the 15" wheel physically fits on the car (clears brakes, struts, etc.),
then you are fine.
Andrew L. Duane (JOT-7) firstname.lastname@example.org
Digital Equipment Corporation (603)-881-1294
110 Spit Brook Road http://www.zk3.dec.com/~duane
Nashua, NH 03062-2698
Only my cat shares my opinions, and she's too heavy to care.