RM90, try something like 10 front and 11 rear. We have had great results with this tyre in 125cc GB in Queesland. Maxxis themselves say nothing more than 13 PSI to start with. When hot you should see the pressure has risen to about 15 PSI with a tyre temp of about 75 - 85 degrees C. I guess you have 5 inch ones as the 6 inch ones havent hit our shores as yet. There is a website called something like karttyre.com and it tells you all about them.
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Re: Maxxis HG3 tyres
There is a website called something like karttyre.com and it tells you all about them.