Tire pressure
- Thread starter markd
- Start date
Blair
Well-Known Member
You running tubes or tubeless? I use less pressure, more traction for wet, loose, higher pressure for faster dry terrain. I don't measure actual numbers, just squeeze the sidewalls and wing it. I used to get a lot of pinch flats with tubes and would do a minimum of 30 for the rear with a tube.
GSTim
Formerly M3Tim
Mark,
Go as low as possible without pinch flatting. Use these numbers as a guideline, it will be tough to use pressures this low if you are not running tubeless, but this is close to where you want to be:
http://www.notubes.com/help_center_tire_pressure.aspx
Tim
Go as low as possible without pinch flatting. Use these numbers as a guideline, it will be tough to use pressures this low if you are not running tubeless, but this is close to where you want to be:
http://www.notubes.com/help_center_tire_pressure.aspx
Tim
ellenserruto
New Member
at 105lbs I'm at 16psi front 18 rear
Try it! one ride you'll be hooked.
Try it! one ride you'll be hooked.
WTF is 115-130 cmHg?
tommyjay
Not-So-Venerable Asshat
Me being a smartass and using a different unit of pressure. Meteorologists would understand.
1.7 atmospheres should do it :hmmm: bike would be too heavy if you fill the tires with Hg......😀
Here is a nice converter...
at 180lbs running 32-35psi w/tubes...no flats yet
who wants to stop by and help with the tubeless kit? can now blame tire pressure for failing to climb those ups....
Wow.. You can't just disappear for 10 years and come back and be a smart-ass.
Chris(NJ)
Well-Known Member
YOu need to play with the tire pressure and figure out what works best for you. If tubeless, the link above is a good starting point.
Fwiw, I thought running super low pressure was right based on what others have used. Played with the numbers and settled on 30lbs and yes, that's tubeless. (I weigh 170 if it matters) Having said that, it's not just rider weight that should determine pressure but riding style as well.
Similar to you, if it's really wet out I might drop that number to help with traction.
Fwiw, I thought running super low pressure was right based on what others have used. Played with the numbers and settled on 30lbs and yes, that's tubeless. (I weigh 170 if it matters) Having said that, it's not just rider weight that should determine pressure but riding style as well.
Similar to you, if it's really wet out I might drop that number to help with traction.
Blk06CompIRL
Active Member
6ft 179lbs, 26 HT, bontrager xr4 2.3 frt/ 2.2 rear, running WITH tubes frt and rear 24 - 26 psi never had a pinch flat. used to run a little higher psi but tire is to ggressive for hard pack so i would skid out and feel sloppy and would bounce to much on rocks/roots. so lower psi softer/smoother ride better grip on all terrain to fit my riding.
Last edited:
HeavyMetaLance
Well-Known Member
There are lots of factors involved such as rider weight, type of tire, tire volume (bigger tiers can run lower pressure), conditions (wet, dry, rocky, muddy, etc.)
Asking other people will help you get a within a reasonable range, but to really get it perfect, you just gotta keep testing it out.
Having said that, I weigh 190. I ride Geax tubeless on my 29er mtb. I usually run around 25psi. Sometimes I'll run 23 if it's muddy.
Asking other people will help you get a within a reasonable range, but to really get it perfect, you just gotta keep testing it out.
Having said that, I weigh 190. I ride Geax tubeless on my 29er mtb. I usually run around 25psi. Sometimes I'll run 23 if it's muddy.
pxs231
Active Member
Just a word of caution, once you start riding some of the places you want to ride as mentioned in your signature, unless you walk all of the rocky sections, you WILL get pinch flats with your current setup.
HeavyMetaLance has good insite. There are too many factors to just have a weight based number. I'd just keep going lower until you starting hitting the rim or pinch flatting. see what feels good. You also need to be leary of going too low, especially on the front. if your pressure is too low you can roll the tire off the rim in a hard corner or rocky downhill. I've done this and crashed hard.
just to throw numbers out. I run tubless as follows:
29 x 2.0 captains: 20-22lbs front and rear.
29 x 1.95 renegades: 22-24lbs front and rear.
I'm ~190lbs and would consider myself a XC rider.
just to throw numbers out. I run tubless as follows:
29 x 2.0 captains: 20-22lbs front and rear.
29 x 1.95 renegades: 22-24lbs front and rear.
I'm ~190lbs and would consider myself a XC rider.
Blk06CompIRL
Active Member
haha yeah i have considered that so will use the method of use it till it fails lol. I always have tubes on me and patch kits and a pump just in case. thanks for the heads up im sure i have been pushing the limits of pinch flatting but knock on wood 300 miles logged with the XR4 and good to go haha
this is a good baseline:
http://www.notubes.com/help_center_tire_pressure.aspx
Tech Tip - Tire pressure
To determine a starting tire pressure when running NoTubes tires with our ZTR rim use this simple formula.
Rider Weight in pounds divided by 7 = x
x - 1 = Front tire pressure in PSI
x + 2 = Rear tire pressure in PSI
Example: 185lb rider
185/7 = 26.4
Front tire pressure: 26 - 1 = 25 PSI
Rear tire pressure: 26 + 2 = 28 PSI
http://www.notubes.com/help_center_tire_pressure.aspx
Tech Tip - Tire pressure
To determine a starting tire pressure when running NoTubes tires with our ZTR rim use this simple formula.
Rider Weight in pounds divided by 7 = x
x - 1 = Front tire pressure in PSI
x + 2 = Rear tire pressure in PSI
Example: 185lb rider
185/7 = 26.4
Front tire pressure: 26 - 1 = 25 PSI
Rear tire pressure: 26 + 2 = 28 PSI
