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Tire pressure
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 2012-07-12 7:35 AM |
Elite  3515    Romeoville, Il |  Subject: Tire pressureI'm curious if any of you guys that have a lot of experience on race tires have any suggestions/comments on this....... My usually tire of choice for racing/training is Conti GP4000s with Michelin latex tubes. For my HIM this weekend I decided to try Vittoria Open Corsa CX tires and Vittoria latex tubes. First off, I have to say the removable valve core and extension system is waaaaaaaaaaaaaaay better on the Vittoria tubes than the original extension I got with my HED wheels on the Michelin tubes. However, the ride is much much rougher on this combo of open corsa and vittoria latex. On the Conti's I always ran 120psi. On the new race combo I tried 135psi rear, 130psi front. The combo and air pressure definitely "feels" faster (I have no hard data to proove this). The Vittoria tire has a max psi of 140 while the old conti's had a 120 max. I'm only a couple days from race time, I don't have a lot of time to mess with the air pressure Willy Nilly. Is the ride just supposed to be a little rougher on race tires like this, or should I play with the air pressure?
thanks |
| 2012-07-12 7:41 AM in reply to: #4307360 |
Champion 9407  Montague Gold Mines, Nova Scotia | Subject: RE: Tire pressure If you have time you can test Crr to find what pressure is going to work best for you. Since you seem time limited, then I would go with a pressure similar to what you were using in your old tires. Just because it feels faster doesn't actually mean that it is; road testing that I have seen seems to put the sweet spot for Crr somewhere around 100-120psi depending on the rider. FWIW I usually train at 100psi and race at 110psi which is what tested the fastest for me. Shane |
| 2012-07-12 7:46 AM in reply to: #4307360 |
Elite 3515 Romeoville, Il | Subject: RE: Tire pressure I have no idea how to begin testing Crr!
So....you're saying it doesn't really matter that the open corsa's max psi is higher than the GP4000s's? I guess I just assumed the Open Corsa's were designed to run at a higher psi. Am I completely off base there? |
| 2012-07-12 7:48 AM in reply to: #4307360 |
| Subject: RE: Tire pressure This is used as a general rule for pressure no matter what's printed on the side of the tire.  |
| 2012-07-12 7:55 AM in reply to: #4307388 |
| Extreme Veteran 406 | Subject: RE: Tire pressure DanielG - 2012-07-12 8:48 AM This is used as a general rule for pressure no matter what's printed on the side of the tire. |
| 2012-07-12 7:55 AM in reply to: #4307388 |
| Extreme Veteran 406 | Subject: RE: Tire pressure Good stuff!
DanielG - 2012-07-12 8:48 AM This is used as a general rule for pressure no matter what's printed on the side of the tire. Edited by Bodaggit 2012-07-12 7:55 AM |
| 2012-07-12 7:56 AM in reply to: #4307388 |
Elite 3515 Romeoville, Il | Subject: RE: Tire pressure DanielG - 2012-07-12 7:48 AM This is used as a general rule for pressure no matter what's printed on the side of the tire. WOW!!! I should drop more than 20psi!!! Yikes!!! Thanks Daniel! |
| 2012-07-12 7:58 AM in reply to: #4307360 |
Pro 5892 , New Hampshire | Subject: RE: Tire pressure Max tire pressure means nothing... (unless you're on a perfectly smooth track...). Look at the chart that DanielG posted... there's very few people that should be anywhere near 120 psi. Higher pressure doesn't mean better, but rather, many times slower... on a perfectly smooth track, the wheels won't bounce with the imperfections in the surface (since there are none), but on the road, you will actually diminish your power transfer with a higher pressure (smaller contact surface to transmit the power) I switched over to tubeless and I'm now running 95psi.. much better comfort and rolling resistance. |
| 2012-07-12 8:09 AM in reply to: #4307360 |
Master 2725 Washington, DC Metro | Subject: RE: Tire pressure What they said...
The "rough" ride is mostly likely because you are running your pressure waaaay too high. I run at about 110 rear and 100 front. |
| 2012-07-12 8:16 AM in reply to: #4307360 |
Elite 3515 Romeoville, Il | Subject: RE: Tire pressure Thanks BT!! I'm at 165-170lbs so I'll try running about 110-115 and take it for a ride before I head up to Racine. |
| 2012-07-12 9:20 AM in reply to: #4307360 |
| over a barrier | Subject: RE: Tire pressure I run 100 psi at 150, I can't imagine running 130psi..I would be bouncing down the round. I would highly recommend dropping for racine, those roads are rough. |
| 2012-07-12 9:20 AM in reply to: #4307360 |
Master 1517 Grand Prairie | Subject: RE: Tire pressure I am 220lbs, so I always go with max pressure. Funny though that the max on the tire-sidewall does not match the max as per manufacturere website (Tires: Schwalbe Lugano). Hece I go with ~120psi... |
| 2012-07-12 9:25 AM in reply to: #4307599 |
Elite 3515 Romeoville, Il | Subject: RE: Tire pressure running2far - 2012-07-12 9:20 AM I run 100 psi at 150, I can't imagine running 130psi..I would be bouncing down the round. I would highly recommend dropping for racine, those roads are rough.
that was a big concern of mine. Those first and last few miles just about chattered my teeth out last year! |
| 2012-07-12 9:44 AM in reply to: #4307600 |
Master 2327 Columbia, TN | Subject: RE: Tire pressure timf79 - 2012-07-12 9:20 AM I am 220lbs, so I always go with max pressure. Funny though that the max on the tire-sidewall does not match the max as per manufacturere website (Tires: Schwalbe Lugano). Hece I go with ~120psi... At your weight, max pressure is the best choice.
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| 2012-07-12 9:46 AM in reply to: #4307440 |
Master 2327 Columbia, TN | Subject: RE: Tire pressure Meulen - 2012-07-12 8:16 AM Thanks BT!! I'm at 165-170lbs so I'll try running about 110-115 and take it for a ride before I head up to Racine. That pressure chart is from Michelin. You should try to find a manufacturer's recommendation before taking another manufacturer's recommendation. Since the ideal pressure varies based on tire width and casing TPI... However, it looks like Vittoria's pressure chart matches in this case... http://www.vittoria.com/tech/recom-tyre-pressure/
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| 2012-07-12 10:08 AM in reply to: #4307360 |
Master 3205 ann arbor, michigan | Subject: RE: Tire pressure I run my Vittoria Open Corsas at 105 PSI and they feel awesome and roll so smooth. I am not surprised that they are really rough at 130 PSI. They are probably as hard as hockey pucks. It doesn't mean it is the wrong pressure but more does not always mean better when it comes to tire inflation. I only weigh about 145 lbs so I don't need 130 PSI of pressure. Somewhere here on the internet is a chart/graph of what the ideal tire pressure is for a given rider's weight. I don't have time to find it right now but will try later. It may be produced by Michelin if you want to try to find it via google. I have seen it reproduced several times in ST forums/threads. Never mind. I should have read further. I see that others have gotten the graph for you  Edited by wannabefaster 2012-07-12 10:09 AM |
| 2012-07-12 12:22 PM in reply to: #4307388 |
Extreme Veteran 467 | Subject: RE: Tire pressure Nice, being over 180 (and will probably never be below it) I don't have to worry about this. Just go to max. |
| 2012-07-12 12:25 PM in reply to: #4307360 |
| Member 11 | Subject: RE: Tire pressure Regarding Tubulars. My thinking has been they'd be run @ higher psi since rating on tire is higher than clinchers, for example my Continental Sprinter tubulars rate max at 170psi. Would all this info in thread apply to tubular as well? I use them only for races and an occasional test ride and typically inflate to 130psi. (me 175 lbs). Now I'm wondering if this is too much. |
| 2012-07-12 12:37 PM in reply to: #4308064 |
Not a Coach 11473 Media, PA | Subject: RE: Tire pressure TriMDC - 2012-07-12 1:22 PM Nice, being over 180 (and will probably never be below it) I don't have to worry about this. Just go to max. No. Those charts are for Michelins with a 116psi max. If you ride tires with a higher max, odds are you will still want to stay well below it. |
| 2012-07-12 12:38 PM in reply to: #4308066 |
Not a Coach 11473 Media, PA | Subject: RE: Tire pressure AsSeenOnTV - 2012-07-12 1:25 PM Regarding Tubulars. My thinking has been they'd be run @ higher psi since rating on tire is higher than clinchers, for example my Continental Sprinter tubulars rate max at 170psi. Would all this info in thread apply to tubular as well? I use them only for races and an occasional test ride and typically inflate to 130psi. (me 175 lbs). Now I'm wondering if this is too much. Yes, too much. Same rules for optimal inflation apply. The reason is that the tire becomes 'slower' at higher pressures unless you are running them on a very smooth surface (like, e.g., a velodrome track). |
| 2012-07-12 6:49 PM in reply to: #4307360 |
| Veteran 597 | Subject: RE: Tire pressure More info to base an opinion onhttp://www.adventurecycling.org/resources/200903_PSIRX_Heine.pdf |
| 2012-07-12 7:11 PM in reply to: #4307360 |
| Member 796 Malvern, PA | Subject: RE: Tire pressure Agree with tire pressure chart on page 1. You might want to even put in 5 PSI less in front. Very common newbie mistake is pumping up to "max" psi listed on tire sidewall. That's just dumb but very common. |
| 2012-07-12 9:51 PM in reply to: #4307360 |
Veteran 130 | Subject: RE: Tire pressure So I'm about 142lbs. and have Zipp404's w/Michelin pro tires... What PSI (front & rear) advice would you give for Racine to me? |
| 2012-07-12 10:54 PM in reply to: #4307360 |
Master 1439 Calgary, AB Silver member | Subject: RE: Tire pressure Get a bathroom scale and a wall, put one wheel on the scale, get in aero, note weight, do same with other wheel. We tend to put more weight on the front wheel than roadies. http://www.adventurecycling.org/resources/200903_PSIRX_Heine.pdf Then check the graph top right corner and adjust for tire size and weight. Ie for me at 155, I was 110 front, 105 rear with a 20mm tire in front and 23 rear. Worked great.
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| 2012-07-13 3:35 AM in reply to: #4307360 |
Regular 1893 Las Vegas, NV | Subject: RE: Tire pressure Wow I weigh 121 and I run it at 120. How much should I lower it to? I have GatorSkins. |
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