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Air pressure. Weigh 160lbs and ride on 23mm tires
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 2008-08-29 3:31 PM |
Regular 408 |  Subject: Air pressure. Weigh 160lbs and ride on 23mm tiresI have a HED3 up front with a GP4000s tire. Curious what people recommend for air pressure. I have it at 110psi right now. On the back I have a Shimano R10 with a Vitoria Diamonte Pro Slick. I have this at 120 psi. Both tires are 23mm. I have a short, 12 mile, race tomorrow. Relatively good surface. What do people think of the pressure? I am considering taking both down 10psi.
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| 2008-08-29 4:29 PM in reply to: #1638516 |
| 9 | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires I don't know how much good this will do you, but I weigh 165, and have 700x25C tires, and run them at 125 psi. |
| 2008-08-29 4:34 PM in reply to: #1638516 |
 Lafayette, CO | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires Why do you think you need to take it down? Higher psi means less resistance. |
| 2008-08-29 4:54 PM in reply to: #1638516 |
Elite 2527   Armpit of Ontario | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires 160 lbs running 23mm tires, ideally should be around 109psi: I can't get my Mac to post the graph, so if the image doesn't appear, go to the above link.
Edited by sty 2008-08-29 5:18 PM |
| 2008-08-29 6:15 PM in reply to: #1638516 |
Extreme Veteran 1030 West Windsor, NJ | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires Temperature? air/road? starting vs. race? Keep that in mind. I blew out a tube or two screwing that up. |
| 2008-08-29 7:16 PM in reply to: #1638516 |
Champion 10668 Tacoma, Washington | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires I have 23mm Kendas that I keep at 120psi training or racing. I wouldn't take them DOWN 10psi. |
| 2008-08-29 7:34 PM in reply to: #1638516 |
Expert 717 Washington Court House, Ohio | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires I always run with the max stated on my tires. If I were smaller I might investigate how much over max I could run and then do that. The higher the better considering resistance (which is all I care about). Reduced pressure should help reduce flats, and is I something I only do in the rain (hard tires and wet roads lead to crashes). Edited by DieuEtMonDroit 2008-08-29 7:35 PM |
| 2008-08-29 8:42 PM in reply to: #1638869 |
Champion 10668 Tacoma, Washington | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires "Reduced pressure should help reduce flats" Um... no. The "more flats in the rain" deal is because water acts like an adhesive to keep small things (like glass shards) on the tire long enough to get driven in. Doesn't matter what pressure you're running. But when you lower the pressure, your risk of pinch flats increases. But reducing your pressure (a little) when the road is wet can increase traction. |
| 2008-08-29 9:52 PM in reply to: #1638846 |
Elite 2527 Armpit of Ontario | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires briderdt - 2008-08-29 8:16 PM I have 23mm Kendas that I keep at 120psi training or racing. I wouldn't take them DOWN 10psi. And I personally agree; the chart I linked was for general reference. FWIW I've been riding my Michelin P2Rs at 115-120 to train and up to 140 to race (20psi over) with no problems, and I'm weighing in around 178lbs these days. However I wouldn't recommend to anyone to exceed the max psi. |
| 2008-08-30 5:20 AM in reply to: #1638516 |
Champion 9407 Montague Gold Mines, Nova Scotia | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires According to Tom A. over on ST, the sweet spot for tire pressure seems to be between 110-120psi. Above this, your tires may actuall be slower (due to imperfections in the road). Shane |
| 2008-08-30 1:49 PM in reply to: #1639142 |
| Extreme Veteran 1030 West Windsor, NJ | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires gsmacleod - 2008-08-30 6:20 AM According to Tom A. over on ST, the sweet spot for tire pressure seems to be between 110-120psi. Above this, your tires may actuall be slower (due to imperfections in the road). Shane I agree with this. But isnt this HOT pressure not COLD pressue? big difference. You may only have 105 in your tires when you start, but on a hot day, that could easily become 120 or more with hot pavement. I used run cars on a track..and the trick wasnt to find the right pressure to run your tires ...everyone knew that..it was what COLD pressure to start with in order to hit the optimum pressure when at speed. |
| 2008-08-30 7:47 PM in reply to: #1638869 |
| Master 1728 portland, or | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires DieuEtMonDroit - 2008-08-29 4:34 PM I always run with the max stated on my tires. If I were smaller I might investigate how much over max I could run and then do that. The higher the better considering resistance (which is all I care about). Reduced pressure should help reduce flats, and is I something I only do in the rain (hard tires and wet roads lead to crashes). These are myths. In reality running your tires at a high pressure will cause the tire to bounce and INCREASE rolling resistance. Optimum tire pressure is based on body weight. The lighter the rider, the less pressure. Reducing tire pressure won't reduce flats, unless of course your reducing it from being over inflated. In fact too low a pressure will increase the chance of flats. But that's going below the recommended tire pressure. I would suggest the OP ride at 110 - 115. scott |
| 2008-08-31 7:03 PM in reply to: #1638516 |
| Extreme Veteran 1030 West Windsor, NJ | Subject: RE: Air pressure. Weigh 160lbs and ride on 23mm tires too low pressure = pinch flat, correct? |
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