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Old 05-16-07, 10:25 AM   #1
MattS07
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What psi do you run?

Yes, I'm a newb. What is a good recommended psi for on and off road use?
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Old 05-16-07, 10:27 AM   #2
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30-40 psi for me
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Old 05-16-07, 10:28 AM   #3
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140psi
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Old 05-16-07, 10:32 AM   #4
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Depends on the situation, but I commonly run 25 to 30 up front and 40 in the back
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Old 05-16-07, 10:38 AM   #5
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Quote:
Originally Posted by Maelstrom
Depends on the situation, but I commonly run 25 to 30 up front and 40 in the back
Carefull with that low psi...you could be replacing a lot of rims if you ride rough trails

usually something around 45 works best
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Old 05-16-07, 10:44 AM   #6
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Quote:
Originally Posted by jm01
Carefull with that low psi...you could be replacing a lot of rims if you ride rough trails
Are you telling Maelstrom to be careful with his pressure in the front...if so...HAHAHA!


Quote:
Originally Posted by jm01
usually something around 45 works best
Maybe for your trails/you/bike setup. The optimal pressure will depend on a lot of things...your bike setup, tire size, trails, your weight, riding style, etc...
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Old 05-16-07, 10:49 AM   #7
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I usually go a little high because i hate pinch flats and soft punctures. So around 37 or so.
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Old 05-16-07, 10:52 AM   #8
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Quote:
Originally Posted by never
Are you telling Maelstrom to be careful with his pressure in the front...if so...HAHAHA!




Maybe for your trails/you/bike setup. The optimal pressure will depend on a lot of things...your bike setup, tire size, trails, your weight, riding style, etc...
not really...take a hit at 25 on your front and you will crease your rim...I've adjusted by running a 2.1 on the front for "float" and a 1.95 rear fro "drive" on one of my bikes

And yes...tire pressure depends on a lot of things, but unless you want to work harder getting a soft tire to roll on the trails, more pressure is better than less. At 25 you will sacrifice speed and safety with that softer sidewall
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Old 05-16-07, 10:56 AM   #9
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Quote:
Originally Posted by jm01
not really...take a hit at 25 on your front and you will crease your rim...I've adjusted by running a 2.1 on the front for "float" and a 1.95 rear fro "drive" on one of my bikes

And yes...tire pressure depends on a lot of things, but unless you want to work harder getting a soft tire to roll on the trails, more pressure is better than less. At 25 you will sacrifice speed and safety with that softer sidewall
You're making a lot of assumptions here. You have no idea what kind of riding he does, so why are you suggesting what his tire pressure should be.

The same goes for the OP, optimum tire pressure depends on the rider, bike and terrain.
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Old 05-16-07, 10:57 AM   #10
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Quote:
Originally Posted by jm01
Carefull with that low psi...you could be replacing a lot of rims if you ride rough trails

usually something around 45 works best
Not with fat tires and DH tubes. I run 25-28 front and rear and haven't pinch-flatted in a year.
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Old 05-16-07, 10:58 AM   #11
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Quote:
Originally Posted by jm01
not really...take a hit at 25 on your front and you will crease your rim...I've adjusted by running a 2.1 on the front for "float" and a 1.95 rear fro "drive" on one of my bikes

And yes...tire pressure depends on a lot of things, but unless you want to work harder getting a soft tire to roll on the trails, more pressure is better than less. At 25 you will sacrifice speed and safety with that softer sidewall
You're assuming everyone rides cross country on smoother trails.

With one of my bikes, if I ran 45 psi up front I would be sacrificing speed and safety.
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Old 05-16-07, 11:15 AM   #12
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Quote:
Originally Posted by never
You're assuming everyone rides cross country on smoother trails.

With one of my bikes, if I ran 45 psi up front I would be sacrificing speed and safety.
maybe, my home trails are hardpacked forest...mostly sand, hence the 2.1 @45 front

However, i do ride the trails on Blue Mountan, our local 800' "hill...mostly limestone, clay, with rock gardens and roots

here I use a bike with 1.95 Nevegals on Mavic 717's, but also @ 45 psi...I find that a stiffer sidewall works best in the rocks. My wife rides DH DDY rims with Kenda Megas at about 40...those wide tires offer more cushion, but I can only fit up to 2.3 in the fork and chain stays on this bike

I guess this is what makes life interesting
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Old 05-16-07, 12:04 PM   #13
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So I'd be good running about 40 front and back until I get a feel for the trails?
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Old 05-16-07, 12:15 PM   #14
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Quote:
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So I'd be good running about 40 front and back until I get a feel for the trails?
40 works well
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Old 05-16-07, 12:19 PM   #15
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I"m strictly a XC rider on singletrack. I run tubes with Slime. PSI front and rear is 37 for all conditions.
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Old 05-16-07, 12:27 PM   #16
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Quote:
Originally Posted by Pete Fagerlin
For on road use the tire is hard when I pinch it between my thumb and index finger.

For off-road use the tire is squishy when I pinch it between my thumb and index finger.
Actually thats pretty much what I do. I haven't actually checked the exact pressure of any of my bike tires in a long time.

On the mountain bike my front is a little squishier than the rear.
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Old 05-16-07, 01:04 PM   #17
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As much as possible to lower rolling resistance but still keep traction. You will need to experiment to find the "sweet spot".

Tire pressure is one of the biggest factors that will affect the way your bike handles and rides.
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Old 05-16-07, 01:14 PM   #18
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Thanks for the advice JM01, I will take that into account next time I am pumping up my tires for whistler mountain (little taller and rougher than blue)...

Let me clarify...since "ranges" make people upset

Xc - 35 up front and 45 rear. I like a soft front for those nice rainy days when a square tire gets better traction on roots and rock faces than a round pointy 50psi. If I was riding the shore, I drop the psi a little more, head north to Kamloops, I increase by 5 to 10 psi. Different terrain, different weather, different needs. Most of the time, I am a set and forget, 30psi up front suits everything for me.

Dh - 25 to 30psi depending on the tire I am using, 40 in the rear max, usually closer to 35. On the muddy days I usually drop the pressure a little more. I know there are two lines of thinking on that. Narrow and high pressure cuts the mud, wide and low pressure sits on top. Since I weight enough to make any tire "cut" through mud, I figure I need any traction advantage I can take.

In all those setups, I have never pinch flatted. I am a very large rider with the skill of a ryno running through the woods. If I don't pinch flat I am either lucky or I am doing something right.
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Old 05-16-07, 01:18 PM   #19
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Quote:
Originally Posted by jm01
not really...take a hit at 25 on your front and you will crease your rim...I've adjusted by running a 2.1 on the front for "float" and a 1.95 rear fro "drive" on one of my bikes

And yes...tire pressure depends on a lot of things, but unless you want to work harder getting a soft tire to roll on the trails, more pressure is better than less. At 25 you will sacrifice speed and safety with that softer sidewall
Likely the difference, I don't/can't ride tires that small. My "xc" tire is 2.3. 1.95 is for my commuter tires.
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Old 05-16-07, 01:19 PM   #20
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Quote:
Originally Posted by santiago
140psi
4*35?
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Old 05-16-07, 01:27 PM   #21
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Quote:
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I am a very large rider with the skill of a ryno running through the woods.
LOL! A nimble rhino maybe.
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Old 05-16-07, 01:28 PM   #22
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LOL! A nimble rhino maybe.
You didn't see me in my tootoo did ya?...
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Old 05-16-07, 01:32 PM   #23
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No but thanks for the visual <fiercely gouges minds eye with coathanger>
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Old 05-16-07, 01:46 PM   #24
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Ouch! Ouch! Turn it off! Turn it offffffffff!!!!
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Old 05-16-07, 02:10 PM   #25
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27 to 29 front and 2 lbs more in the rear.

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