barry cooper
The "C" on a tyre is for commercial as is "LT'" for light truck < its marked with one or the other..
As for the tyre pressure the benefit of running the high pressure is to keep the actual vessel cooler therefore not increasing the internal temperature as much. The friction of the tyre on the road causes the vessel to get hot , the lower the pressure the harder the tyre is working hence the hotter it gets then heats the air inside the tyre. An example, try pushing a carof a car with 10 psi in the tyres then push it with 40 psi in it, neither the pusher or the tyre is working as hard at the higher pressure. 40 psi is fine in the hot weather but if the roads are wet drop them back down 32 or 34psi. I run my 400 with 34psi on 165r16 Avons & find the grip amazing in the wet if a little harsh on the rougher roads
My regards Barry.
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