+1

 

Ok, did some research. Dunlop, michelin and metzler all recommend inflation to the bike manufacturer's specs, NOT to the sidewall max listing. In addition, however, this is what metzler had to say...

"Always inflate tires to the correct pressure as indicated in the owner's manual. However Metzeler North America has found the air pressure suggestions listed below will improve mileage and customer satisfaction especially if a emphasis is placed on running the air pressure towards the maximum as stated on the sidewall. Check cold tire pressures frequently. Correct tire pressure is crucial for safe handling. Over inflation may impair ride comfort and reduce the contact patch between the tire and driving surface of the tires. Insufficient air pressure will result in poor handling and cause a tendency for the motorcycle to "wander". In addition, improper and insufficient tire will cause accelerated tire wear, increased fuel consumption, less control and the possibilities for tire failure to due an overload/under inflated operating situation. "

Following this statement is a listing for their tires with single, double-light and double-heavy charts.

This is in line with what I have always understood, hence my general recommendation.

Thanks, Ern

 

As mentioned, what is on the sidewall is the max PSI the tire can handle. A heavier bike would take less PSI than a lighter bike. That tire can be used on many different bikes so the 42 PSI is listed for those applications where a fully loaded heavy bike would need more pressure to keeps its shape. On a lighter, unloaded bike the tire would keep its shape and flex with less PSI. If you over fill the tire by filling it to 42 rather than the manufactures pressure, you will end up with a stiff tire and lack of handling.

What is on the side wall has nothing to do with what you should be using. It does matter however if you plan on hauling concrete blocks and the tire starts to deform and you would then be able to take the tire up to 42 PSI.

 

My owner's manual on my 90 states 36f and 42r at normal loading and at max loading. Stay with Honda's recommendation.

Now, go out and ride the d*mn thing!