Minion Posted March 2, 2012 Posted March 2, 2012 Doesn't anyone use PSI over here? Thought it just my mate being retarded when I was talking PSI and he was looking blankly.It's not our fault you're stuck adhering to an archaic unit system . I pump my tyres to 800 kPa.
'Dale Posted March 2, 2012 Posted March 2, 2012 I weigh in at 95Kg's and pump my Schwalbe Ultremo ZX's to 9 bar (max is 10 bar I think). Ride what you are used to. Changing spec makes handling minimally different but can take away confidence in cornering - well that is all in my opinion. Stick to what you know is all I can say. The roads are fairly bumpy around here too hey. I think the OP suggests that there are dongas there in Vrystaat...
Slowone Posted March 2, 2012 Posted March 2, 2012 Pump til they pop, then 1 pump less... works for me ..........
Prozac Posted March 2, 2012 Posted March 2, 2012 This makes for interesting reading on a friday morning . . . TGIF
Big H* Posted March 2, 2012 Posted March 2, 2012 Also try some Nitrogen from Tiger wheel Try Hydrogen...... it will make the bike lighter..... and the exploding fireball as you cross the finishing line will make headlines all over the world!!!!!
flymango Posted March 2, 2012 Posted March 2, 2012 Another good laugh on a Friday morning. And there I was thinking that Argus pressure wasn't only related to tires, tyres, helium, nitrogen, testosterone and the like ...
T-Bob Posted March 2, 2012 Posted March 2, 2012 It's not our fault you're stuck adhering to an archaic unit system . I pump my tyres to 800 kPa. I'm blaming the queen for that one, she's not even our monarch. No Idea why Aus' runs in KM on one hand and an PSI on the other. Odd. Any thing over 120 and my rims will explode according to American Classic. Will keep them at 110psi and leave the seriously pumped up values to chuck norris and the bone rattling brigade!
Li Mu Bai Posted March 2, 2012 Posted March 2, 2012 Seriously: Depending on your weight, adjust the recommended pressure. 85 kg plus a lil less65kg minus a lil more *loose formula* It has nothing to do with your weight or time you expect to achieve. look at your rims and read the warning label/disclaimer, which usually says what the maximum pressure that your rim with withstand. its no good putting on Schwalbe Ultremo's rated to 10-11bar, and your rims are specified to handle 8 bar max. what happens is you end up cracking your rim sidewalls with the added pressure, been there.match your equipment closely and pump to the max your rim can handle. hard tires = faster rolling but a 'harder' more bumpy ride.
Li Mu Bai Posted March 2, 2012 Posted March 2, 2012 The heavier you are the more additional pressure you add to the pressure inside the wheel. The overall pressure is dictated by the maximum allowable pressure of the tyre. If you exceed that pressure you could be looking for trouble. This argument holds true for road bike tyres as the tyre deforms relatively little at the pressures we pump the tyres 8-10 bar. However for a MTB it is different, where you ride with low pressure and your weight makes a considerable change in the shape of the tyre. On a MTB you do not want the tyre to deform too much as you could damage the rim, snakebites, etc. Therefore you need to increase the pressure for the heavier guy. Keeping in mind that on a MTB lower pressure increases traction. wrong, its dictated by what your wheel rim is designed to withstand.
'Dale Posted March 2, 2012 Posted March 2, 2012 It has nothing to do with your weight or time you expect to achieve. look at your rims and read the warning label/disclaimer, which usually says what the maximum pressure that your rim with withstand. its no good putting on Schwalbe Ultremo's rated to 10-11bar, and your rims are specified to handle 8 bar max. what happens is you end up cracking your rim sidewalls with the added pressure, been there.match your equipment closely and pump to the max your rim can handle. hard tires = faster rolling but a 'harder' more bumpy ride. Good points.That is why I wrote "a lil more" not laaik 11 instead of 8. Technically, there are some margins to play with.
D-Mike Posted March 7, 2012 Posted March 7, 2012 wrong, its dictated by what your wheel rim is designed to withstand. Say your rim is designed to withstand 20 bar and the tyre is designed to withstand 10 bar. Which one dictates? I think it would be the tyre.If your comfort level is best at 8 bar, then your comfort level dictates the tyre pressure.The rim's designed pressure is but one consideration, even though a very important consideration.
LeTurbo Posted March 7, 2012 Posted March 7, 2012 My tyres say 120 psi, so I go to 130psi (or, if you're finicky, 8.96318448 bar) 'cos I only wear 60kg. Should I go harder, as a last minute adjustment to make the night before when I also index the gears, clean out the bearings, and adjust the brakes?
Big H* Posted March 7, 2012 Posted March 7, 2012 My tyres say 120 psi, so I go to 130psi (or, if you're finicky, 8.96318448 bar) 'cos I only wear 60kg. Should I go harder, as a last minute adjustment to make the night before when I also index the gears, clean out the bearings, and adjust the brakes? No, yes, yes and yes. The last three and many others are all part of good practice when you have a bike. Preferrably not done the nite before because the tik tik tik tik noise as the bearing bounced away and out of sight will mean you cannot race the next day.
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