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Re: Quattro & spare tyre
If the Opel had a problem with the difference between new and old tires of
the same size, I don't think it's safe to go on this type of calculation.
This may be fine for a non-Torsen center diff when it's not locked.
>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.
San Jose, California
'87 560 SL