Low UST pressure = rim knock

[Domin8tr]

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?

[Little-Ben]

shave some weight off mate ;-)

[Iwan Kemp]

Are those UST tyres though? I weigh 95k's and run my Nevegals 20psi front, 25rear and have never had an issue.

[Johan Bornman]

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.

[Mudsimus]

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.

[Weight Weenie]

But this would also depend on if your're sitting on the bike or unweighting it over the rocks right, or not ?

[Headshot]

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.....