Firestone Accu-forge wheels

[Pete Masterson]

All the tires on the axle with duals should be as nearly identical in
all aspects as they can be. In particular, the rolling diameter
should be as identical as is possible. Since it is unlikely that a 7"
and 8" wheel would allow the (appropriate) tires on them to have
_exactly_ the same rolling diameter then it is not advised. If the
rolling diameter is not identical, the smaller tire will not carry
its share of the weight and the larger tire sill be subject to early
failure -- and the smaller tire will be subject to 'scrubbing'
causing it to wear excessively.

While the difference across sides on the dual axle aren't as
critical, differences will cause the differential to work harder and
may cause excessive wear and/or potential differential failure. (I
had a differential failure with an automobile while on the SF Bay
Bridge. It was a terrifying situation and eventually a very expensive
repair. The failure in that case was due to a manufacturing defect
that was fortunately covered under warranty...)

Pete Masterson
'95 Blue Bird Wanderlodge WBDA 42
El Sobrante CA
aeonix1@...



On Aug 21, 2007, at 11:05 PM, kingmtpg wrote:

> Is there any harm in mixing 7.5" with 8.25" if the tire width would
> be correct for the 8.25"? As long as the tires don't rub on the
> inside of the duals? Thanks again, Brad Bloxham 78 35FC
>