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Tyre pressure's and valves
| MentalPedalPusher | 16 Oct 06:52 |
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Joined: 15 Oct 2009 Posts: 8 Bike: | Hi all please help got mountain bike with schrader valves, when im on road like them up to 60psi, but finding that after leaving bike standing for few hours they drop(no not a puncture!!!) even bought new innertubes and still the same, guys in halfords say should be ok at the pressure but still "leak" should i just forget schrader and go for presta valves as belive can have more psi in, and will presta sit in rim ok??? please help sick of pumping up tyre's |
mattk 
| 16 Oct 08:42 |
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Joined: 07 Apr 2009 Posts: 116 Bike: My Profile | Schrader valves shouldn't be leaking air under high pressure... they're used on all car tyres too. Have you been using valve caps though? If you don't, the rubber seal can get contaminated with dirt and water and will eventually break up - it shouldn't happen on a new tube though....hmm. |
| My Latest Route: Feb 2010 National Cycle Network 15 NCN | |
| MentalPedalPusher | 16 Oct 08:52 |
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Joined: 15 Oct 2009 Posts: 8 Bike: | i must just be lucky but its driving me mad???? 60 psi should still be ok do you think |
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mattk
| 16 Oct 09:23 |
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Joined: 07 Apr 2009 Posts: 116 Bike: My Profile | I don't really know 100% because 45psi is quite high pressure on a car, I don't really pump a tyre on my bike to any particular pressure (just use hand pump). Have you tested them at a lower pressure to see what they ride like? 60psi sounds quite high. Maybe send an email to the tyre manufacturer and ask them what the max pressure is... |
| My Latest Route: Feb 2010 National Cycle Network 15 NCN | |
| MentalPedalPusher | 16 Oct 09:40 |
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Joined: 15 Oct 2009 Posts: 8 Bike: | the tyres are happy about the 40psi mark but just find that little bit more makes the ride so much more smoother and less tyre making contact the better, anyone know if presta holds more?? anyone know of good tyres fit for both road and off road, liked the dmr motos but found them heavy, also used the continental double fighter but ate though them so quick at the pressure and riding 150 miles a week plus kills them, |
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sonyfreak
| 20 Oct 19:23 |
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Joined: 30 Jul 2009 Posts: 17 Bike: My Profile | you shouldn't need to change valves, but I agree 60 psi is a little high. Check the pressure rating on the sidewall of the tyres and inflate (or should that be deflate) your tyres to that pressure. Do the tyres reach a certain pressure, or do they continue to leak until there is very little air in them? Strange whatever!! |
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globalfish
| 27 Nov 20:36 |
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Joined: 27 Nov 2009 Posts: 14 Bike: My Profile | Try tweaking the valve core a little tighter- or a drop of water over it to see if valve leaks. Neither Schrader, Presta or Woods should leak esp. in a few hours. |
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