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PostPosted: Sat Dec 13, 2008 11:54 pm 
Retro Guru
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Joined: Sun Apr 06, 2008 1:51 pm
Posts: 1299
ive no idea about tyre pressure :lol: :lol: :lol: not very helpful.... i just pump them up until they feel ok thats it. i do have the tyres on my dmr pumped up so theyre rock hard and on the gt theyre abit squishy :lol: :lol: :lol: i dont even know what tyres i have on :lol:


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PostPosted: Sun Dec 14, 2008 12:25 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Thu Aug 23, 2007 9:09 am
Posts: 4806
Location: Location: Location:
I think on a rigid i'd definitely run em a bit softer if only to get a bit more comfort :wink:

Chris.


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 Post subject: Tire pressure
PostPosted: Mon Dec 15, 2008 12:37 am 
The Killer
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Joined: Tue Dec 04, 2007 6:09 pm
Posts: 283
Location: Leicester
heathy wrote:
I use 38.239 in the front and 41.487 in the rear :wink:


This debate is raging on on many a bike forum. The theory of running 38.239 sounds plausible ....................... :lol:

I use 2.1 Conti Speed Kings supersonics tubeless at about 25 psi and they're perfect for me at 60kgs on a hardtail on any XC course, but for rough stuff I go for 2.2 mountain kings at the same pressure. I can't understand why anyone would be running more than 35 off road, thats crazy :shock:


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PostPosted: Mon Dec 15, 2008 12:59 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
It all depends on your weight. The tyre flattens and enlarges the contact area so that the weight supported by the wheel = the contact area x PSI.

So say at 30 psi, with a 30lb load it will give a 1 sq inch contact area.

So if you are heavy, you get a big contact patch and the tyre distorts more: more rolling resistance, and more likely to have a pinch flat.


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