I've done some leg work on this. The tyre pressure quoted in the manual is for the OE tyres the bike was sold with - in my case Dunlop Trailmax (not necessarily the same as aftermarket Trailmax either). Having run other tyres at 21psi since, I've noticed that I've been getting very low tyre life which on many occasions meant replacing the front before the rear had worn out. I have since run the tyres at the tyre manufacturer's recommended pressure (not always easy to find) and found tyre life much improved.
At the moment, I have Avon Road Riders (a pure road tyre) and they are run at 29psi front and 32psi rear.
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"On that? You're nuts!" - My cousin's boyfriend
Current Bikes - Kawasaki KLE500 '05 (May 06)
Previous Bikes - Hyosung GF125 (Oct 05 to May 06)
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