Speed Racer Posted November 7, 2011 Share Being a roadie, I don't get to ride my MTB much. Doing the 94.7 MTB event on Sunday. What pressure should I run my tyres at? Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/ Share on other sites More sharing options...
NotSoBigBen Posted November 7, 2011 Share You could get a few different answers here but I guess the first question you will be asked is 'how much do you weigh'? Tubed or tubeless .... Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1525971 Share on other sites More sharing options...
Speed Racer Posted November 7, 2011 Share You could get a few different answers here but I guess the first question you will be asked is 'how much do you weigh'? Tubed or tubeless ....Thanks, BB. 100kg. Tubed. Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1525975 Share on other sites More sharing options...
NotSoBigBen Posted November 7, 2011 Share I weigh anything between 95 and 100kg's (maybe not important) and can only comment on tjoopless 35PSI back /30PSI front Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1525979 Share on other sites More sharing options...
Speed Racer Posted November 7, 2011 Share I weigh anything between 95 and 100kg's (maybe not important) and can only comment on tjoopless 35PSI back /30PSI frontCool. Thanks. Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1525984 Share on other sites More sharing options...
funjunkie Posted November 7, 2011 Share Why dont you use the the maximum pressure allowed for your particular tyre. Ie as per the info on the side wall.More pressure means lower rolling resistance. Edited November 7, 2011 by funjunkie Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526089 Share on other sites More sharing options...
Pusher Posted November 7, 2011 Share Lower pressure give you better resistance and handling.http://www.mtbonline.co.za/info/mtb-tyre-rolling-resistance.htm Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526099 Share on other sites More sharing options...
Speed Racer Posted November 7, 2011 Share Why dont you use the the maximum pressure allowed for your particular tyre. Ie as per the info on the side wall.More pressure means lower rolling resistance.Thanks. This is what I do on my roadbike. The higher the pressure the less the traction for more technical stuff. This is the idea for tubeless, that you can run the tyres at lower pressures without risk of snakebites. I also find that at max pressure it's a pretty hard ride. Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526164 Share on other sites More sharing options...
tombeej Posted November 7, 2011 Share Why dont you use the the maximum pressure allowed for your particular tyre. Ie as per the info on the side wall.More pressure means lower rolling resistance. If you're talking about a road tyre, then fine. But mtb is a different story. Higher tyre pressure does not mean less rolling resistance. Why do you think people have moved to tubeless and go as low as possible on tyre pressure (and even go with wider tyres, not thinner). Because it's a faster setup, that's why. Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526173 Share on other sites More sharing options...
Speed Racer Posted November 7, 2011 Share Lower pressure give you better resistance and handling.http://www.mtbonline.co.za/info/mtb-tyre-rolling-resistance.htmGreat article. Thanks. Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526204 Share on other sites More sharing options...
dre Posted November 7, 2011 Share Lower pressure give you better resistance and handling.http://www.mtbonline.co.za/info/mtb-tyre-rolling-resistance.htm Very interesting Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526214 Share on other sites More sharing options...
Speed Racer Posted November 7, 2011 Share Very interesting [/quote Yip. Thanks, Pusher, for the definitive answer. Herewith the conclusion: Anyone who wants to ride really fast off-road needs to decrease tyre pressure. The rougher the ground, the more pronounced the effect. In addition traction and comfort increase, too. Due to their thin and flexible structure, semi-slicks offer the best start-up values for minimizing rolling resistance off-road. With a reduction in pressure, however, the risk of a flat increases. And traction with the semi-slick is limited. So the answer to the question of which width is best off-road clearly reads 'fat tyre' both for superior traction and snake bite prevention. For cross-country-races and marathons involving only a small percentage of tarmac a wide tyre with low pressure is recommended. The most overestimated aspect here is the frequently criticized extra weight of the wider tyre. To accelerate a pair of tyres with an extra weight of 500 g from 0 to 25 kph in 4 seconds requires an additional 4.2 W power. On the other hand the wider tyre on a grassy surface saves you 15.5 W against a narrower specimen, and this at the low speed of 9.5 kph. Moreover the rolling resistance reduction has a continuous effect while lighter weight is only of relevance during acceleration. In short, put as little air as you can into the tyre without puncturing. Next upgrade: tubeless! Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526455 Share on other sites More sharing options...
Goodbadugly Posted November 7, 2011 Share Why dont you use the the maximum pressure allowed for your particular tyre. Ie as per the info on the side wall.More pressure means lower rolling resistance.Eina! Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526462 Share on other sites More sharing options...
funjunkie Posted November 7, 2011 Share Why dont you use the the maximum pressure allowed for your particular tyre. Ie as per the info on the side wall.More pressure means lower rolling resistance. My apologies, I did not read your post correctly. I thought you were planning to do the Road race on a MTB. I agree, maximum pressure for a MTB race will be eina. My bad. Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526483 Share on other sites More sharing options...
LazyTrailRider Posted November 7, 2011 Share In short, put as little air as you can into the tyre without puncturing. Next upgrade: tubeless! Yep, since moving to tubeless I've dropped pressure to 20psi front / 28psi rear (I weigh 69kg), it's amazing how much extra grip and control magically appeared. Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526515 Share on other sites More sharing options...
Iwan Kemp Posted November 7, 2011 Share I weigh 95k's and run 18 - 23 psi front and 20 -25psi rear depending on the trail. Road go as hard as the tyre will allow. Link to comment https://forum.bikehub.co.za/topic/109765-the-mtb-tyre-pressure-thread/#findComment-1526529 Share on other sites More sharing options...
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