Shouldn't hurt anything with the spare on the front, on the rear should be
ok for a little while. For a prolonged period it may loosen up the
differential creating more one wheel slippage in low traction conditions.

Velma 82 1.9L AAZ td westy
On Jan 18, 2014 12:24 AM, "Andre Fiedler" <fiedlerac@gmail.com> wrote:

> Hello all,
> I am in the process of upgrading the tires on my 2WD 1989 Westy
> to 215/75R15 size (diameter 27.8").  My current spare is 185R14 (diameter
> 25.7").  I am wondering if using this spare for a short drive in case I
> were to get a flat would potentially cause engine or drivetrain damage of
> any sort due to the difference in tire diameters?
> Thank you.
> Andre Fiedler
>