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Tyre Pressures

Mike.C

Mike.C

High Miler
Joined
Oct 27, 2008
Messages
982
Location
Brisbane
I was reading through some old notes I made when at college the other night (I have a mate's Honda 750 four on the back verandah that needs new fork seals and thought I should bone up!) and found this little gem that I had completely forgotten and thought others might be interested.

Question I suppose is does this rule of thumb apply equally to "modern" large volume tyres (especially large rear sizes) as it did to the skinny little tyres on my 1981 Kwaka :eek:hmy:

Here it is

You will need a VERY accurate guage with a wide scale so that you can read to an accuracy of no less than 1/2psi

Measure your tyre pressure cold, then ride the bike until the tires warm up thoroughly (I would say at least 10km) and measure the pressure again. If it rises about 2psi, you're cold pressure is spot on. If it rises more than 2psi, your cold pressure is too low and vice versa. Too high cold pressures will reduce the warmed up contact patch area with obvious effects on handling/stopping. Low cold pressures have a similar but reverse effect but with the added bonus of other added bad effects on handling . When riding 2-up or heavily loaded, add 2psi to your "cold" pressures as a start, but check again when warmed up.
 
Most digital guages will give you the accuracy you need. Assuming of course that they are in themselves accurate.
But how do you know?
Certainly in the days of the mechanical guages, every one which I owned showed different results on the same tyre.
 
You'd also need a technique that'll minimise loss of air putting the gauge on and off the valve. For that alone, I usually put in half a bar more than the Guzzi-recommended values...

I'm following a thread on tyre pressures on 2 other forums ... On the Guzzi one, people have the same impression as I do: if pressures dip below what Guzzi recommends, the bike starts to handle like a truck. On the more generic forum, people are running pressures that are way lower. One guy mentioned he runs 2.0 bar in front, 1.8 in the rear on his Bandit 1200 ... for riding the twisties! I have the impression I'd be riding on the rim with only 1.8 bar in the rear!! :S
 
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