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Thread: Tubeless tire pressure

  1. #1
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    Tubeless tire pressure

    I was looking at the Stans website. Noticed his formula for tire pressure.

    Rider weight in pounds divided by 7 = x
    x-1 = Front tire pressure in PSI
    x+2 = Rear tire pressure in PSI
    This is a starting point.

    That would put me at 21.5 in the front and 24.5 in the rear. Ive never tried it that low. The Schwalbe RR I have on are TL ready say don't go below 30pis. I'm not trying to over think it. I'm just wondering what y'all are running? Heck I'll try just about anything once.
    "I find that the harder I work, The more luck I seem to have."
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    I run about 25 in a racing ralph and weigh 165. YMMV

    I would assume that stan wants you to beat the **** out of your rims so that you'll buy more. I don't understand how some people, and i'm not talking just skinny racers, get away with running tires so low. I don't jump around, but I still bottom out when pressure gets that low. At 25 lbs my RR's have the obligatory sidewall stripes/damage from railing a corner and almost ripping the tire off the rim. having said that since i've been using stans rims i've only burped air on a couple of occasions even at low pressure.

    I think he might be talking about using a tire with a tubeless bead like a crow or raven. i'm assuming.

    Adam

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    After reading it closer he is talking about his tires with ztr rims. Still crazy low.
    "I find that the harder I work, The more luck I seem to have."
    Cysco Cycles Ti SS 19lbs of fun
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    I run between 28-30 on my SS and 30-32 on my Stumpjumper. Only my SS uses Stans rim though.
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    I weigh 150 and run 24 in the rear and 20 in the front on training rides. When racing or riding faster I add 2 pounds of pressure to my rear and front tires. I have run as low as 18 in the front and not rolled the bead. I do agree with Adam. You cannot ride faster with lower pressure without dinging your rims.

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    Wonder how (body weight / 7) + 1% body weight for the front
    + 1.5% body for the rear, works?

    Gary

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    2.0 Specialized tires 140 lbs rider weight
    22 Front and 22 rear.

    I have gone lower when riding trails I know really well. Never burped a tire...knock on wood. I have gone higher and slightly lower but 22 lbs. is usually were I end up.

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    Gary, going to have to try that ratio. I usually ride 26-32 depending on where I'm riding as I'm 175.
    Thank you sir may I have another?!

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    28-30 here and I have been around 185 with out pack
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    Looks like it might be workin'...roughly.

    What about for Clydesdales? 225lbs. - 35.5 psi rear?
    Last edited by homer; 02-28-2011 at 05:07 PM.

    Gary

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    Reminder......For those reading this thread and may have an interest in ramping their pressure up while on the pavement, please note to never exceed 40 psi on a tubeless set up. Lots of good info above and this conversion from tubes is very worthwhile. You will indeed tweak your pressure based on riding conditions, style and body weight.

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  14. #12
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    Quote Originally Posted by homer View Post
    Looks like it might be workin'...roughly.

    What about for Clydesdales? 225lbs. - 35.5 psi rear?
    I guess that's me and I never run pressure that high. I run the ghetto-est of tubeless (electrical tape and a valve from a tube) on non-ust tires. I run 27-30 up front and 28-32 out back depending on the trail. Flow rims.

    I haven't burped a tire in the longest time (5+ years).

  15. #13
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    Quote Originally Posted by SafetyBreak View Post
    I haven't burped a tire in the longest time (5+ years).
    Guess what is going to happen this weekend.....
    Bloggy

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    In riding shape I'm 150 lbs and run 20-21 in the front and 22-24 in the rear. With a stans flow rim up front and stans arch in the rear. 29er too, smaller tires (meaning 26er's or smaller 29 inch tires) require more pressure. Bigger the tire lower the pressure I run.
    Lynskey Pro 29 SS

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    Quote Originally Posted by jbarber View Post
    In riding shape I'm 150 lbs and run 20-21 in the front and 22-24 in the rear. With a stans flow rim up front and stans arch in the rear. 29er too, smaller tires (meaning 26er's or smaller 29 inch tires) require more pressure. Bigger the tire lower the pressure I run.

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    Rode at 25 PSI tonight and everything was fine until I let my buddy ride the bike. He ran over something and cut the Racing Ralph pretty good. About a 1/4" all the way through. Two rides on the tire. Wont seal so any suggestions? Tube again is my guess. Also I saw on the Stans website that they don't use rim strips with TL ready tires. Whats the deal with that. If you don't have tubeless rims wont you need it?
    "I find that the harder I work, The more luck I seem to have."
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    Stan's has rim strips but you don't need them with their rims. they use a yellow tape to cover and seal the spoke holes and they hold air great. tubless, tubless ready or clincher, which is what I use. works great.

    try a tire patch on the inside of the tire then try to stans it up again. might work or you might waste a bunch of tire sealant.

    Adam

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    oops i reread your post. you may need rim strips with other than notubes rims. not sure.

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    When racing or riding faster I add 2 pounds of pressure to my rear and front tires. I have run as low as 18 in the front and not rolled the bead.

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    Quote Originally Posted by hnoor0044 View Post
    When racing or riding faster I add 2 pounds of pressure to my rear and front tires. I have run as low as 18 in the front and not rolled the bead.
    How wide are your rims? At race pace, I agree with the added pressure but I have run as low as 14 psi in the front and not rolled the bead.
    I am Facebook challenged.

  23. #21
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    Quote Originally Posted by Robert View Post
    How wide are your rims? At race pace, I agree with the added pressure but I have run as low as 14 psi in the front and not rolled the bead.
    he's spam man... he actually copied your post from above.
    http://tennesseemountainbike.com/boa...561#post106561
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    oh well. ;)
    I am Facebook challenged.

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    thanks , i read all reply. I think i should use kenda tubeless tire

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