Hi Barry!!
On Thu, 22 May 1997 barry@fountain.net wrote:
> Of course, I'm confused as to what to do about the higher psi
> specified on the tires, as opposed to the MG manual reference for the
> original tires. There's quite a diff between the 22-24 lbs in the
> manual and the 45 max of the new tires. My guess is that the sensible
Well, the tyre is rated to carry a specified load at the 45 psi max
inflation pressure. Say 1200 lbs at 45 psi. If you cut the load in
half, then you only need half the air pressure to carry the load.
If the front end of the "B" weighs 1200 lbs, each tyre carries 600 lbs.
That would mean an inflation pressure of 1/2 x 45 lbs, or 22.5 psi Add
10% to cover braking weight transfer, and you end up with app 24 psi
In the old days, we'd overfill the tyres, find a quiet stretch of road
and lock up the brakes to leave a skid mark. The centre of the skid
would be darker than the edges, so we'd let some air out, and make
another skid mark. When the skid mark had the same degree of blackness
all across, we'd record the pressure, and run like that.
Nowadays, I'd run the car over the commercial truck scales to give me
the front axle weight, and figure things out from there.
TTUL8r, Kirk Cowen
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