Domin8tr Posted May 20, 2010 Share So the whole idea of running UST systems is to get the tyre pressure down. I weigh about 90kg and if I run my tyres lower than 28psi and i hit a sharp edge I connect my rim. My Crossmarks are rated 30 to 60 psi. Am I in the right neighborhood here or do I need to shave some weight off, to run lower pressure? Link to comment Share on other sites More sharing options...
Little-Ben Posted May 20, 2010 Share shave some weight off mate ;-) Link to comment Share on other sites More sharing options...
Iwan Kemp Posted May 21, 2010 Share Are those UST tyres though? I weigh 95k's and run my Nevegals 20psi front, 25rear and have never had an issue. Link to comment Share on other sites More sharing options...
Johan Bornman Posted May 21, 2010 Share Clearly the pressure is too low for what you're expecting from the tyres. Up the pressure until you dont' bump through. Knocks like that damage the rim. Link to comment Share on other sites More sharing options...
Mudsimus Posted May 21, 2010 Share Dont run over sharp rocks. I use the same pressure as Crow. 20&25 psi...on non UST tyres. And I've never had any issues. Link to comment Share on other sites More sharing options...
Weight Weenie Posted May 21, 2010 Share But this would also depend on if your're sitting on the bike or unweighting it over the rocks right, or not ? Link to comment Share on other sites More sharing options...
Headshot Posted May 21, 2010 Share But this would also depend on if your're sitting on the bike or unweighting it over the rocks right' date=' or not ? [/quote'] And other factors like, the sharpness of the rock edge, speed and the steepness of the decline..... Link to comment Share on other sites More sharing options...
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