Ideal tyre pressure?

[Lone_Ranger]

I also try to check before a ride by pressing down on the tyre with heal of my hand where it meets your wrist and with all your weight and if i can feel the rim then I know they are to soft.

 

I find this to be quite a good indication of tire pressure. My gauge is that I should be able to compress the tire about half way in for the front tire and a bit less for the rear. Any more and the front gets all squishy around tight corners and the back feels "heavy" over hard gravel sections.

[camelman]

Hi

 

We mountain bike for fun, we do not race or go extreme , we cruise along at 12kph around NF, Van Gaalen, Modders and Hero..

 

What would the ideal pressure be for our tubed tyres

 

I am 85kg and my friend is 70kg

 

Why does the wall of the tyre say 2.5 to 4 and all the members are way under that ?

 

Liability, that is the only reason. If you run lower it's on you. Thank our lawsuit happy friends in the USA for that info.

[TheNewGuy]

i ride 1.8 fr and 2.2 rr. luckily Ive got the aerodynamics of a brick. imagine how much i weigh

[camelman]

I weigh 95kg and on a 29r 2.25/2.3 front Tire I run aound 17-19PSI and on the back around 22PSI (Yes I use PSI cause it gives me a bigger scale to work with. There is a big difference between 1.31bar and 1.39 bar)

[Sniffie]

Ideal MTB tyre pressure depends on a few factors. Most important your weight. Other factors being front or back wheel, 29 or 26, tubed or tubeless, type of riding, experience level. Here is a cool calculator that takes every thing into consideration:

http://mtb.ubiqyou.com/

[Spoke101]

 

and then they want to tell me how important a tapered headtube and through axle is WTF.

Tapered Headtube I think does make a small difference on long travel or 29er's but as for QR vs 15mm TA as long as you are using proper skewers I don't find a difference for XC riding.

[Spoke101]

Ideal MTB tyre pressure depends on a few factors. Most important your weight. Other factors being front or back wheel, 29 or 26, tubed or tubeless, type of riding, experience level. Here is a cool calculator that takes every thing into consideration:

http://mtb.ubiqyou.com/

 

According to this I need to run 1.3 and 1.5 bar Front and Rear.

Now this gives huge grip but I have tried this and it is only suitable for extremely smooth single track with NO rocks or roots. The front tyre also tends to roll when cornering hard and then there is the risk of burping the tyre, depending on the makeup of the tyre sidewall and weather it's a UST or TLR tyre. This could also affect what pressures you run and the amount of role experienced (ie, the new Conti protection series seem to have a very ridged sidewall). If just out for a ride then these pressures might suffice but it you planning on riding through any sort of rock garden or "rootie"? section with any vigor or speed you will be smashing in particular your rear rim on everything. Now when you are running carbon rims I prefer to avoid this. But this a good indication and I think it works better if your weight is more normal if there is such a thing.

Finally I think having an accurate pump or gauge is critical.

Edited March 7, 2014 by Spoke101

[TheNewGuy]

I weigh 95kg and on a 29r 2.25/2.3 front Tire I run aound 17-19PSI and on the back around 22PSI (Yes I use PSI cause it gives me a bigger scale to work with. There is a big difference between 1.31bar and 1.39 bar)

 

The weekend warrior dont really care about the .06 like the snakes do.

[rudi-h]

Take your weight, divide by 3.181818.

 

Take the answer to the above. Add 2 for back and subtract 1 for front.

 

Pump your rear tyre to the back number in psi, pump your front tyre to front number in psi.

 

Always respect the tyre manufacturers minimum and maximum.

 

never trust a person that measures pressure in psi

[Bodhi]

I am 105kg's and run my back ar 2 bar and front at 1.8 bar which works well for me.

 

Maybe use the formula provided by carbon29er and while on a ride let your tyres down a bit at a time until you find the sweet spot for your tyre and type of riding.

 

Good grief. I'm 100kgs...and, um...I guess 4 bar front and back is a little too high?

[Vetseun]

Ideal MTB tyre pressure depends on a few factors. Most important your weight. Other factors being front or back wheel, 29 or 26, tubed or tubeless, type of riding, experience level. Here is a cool calculator that takes every thing into consideration:

http://mtb.ubiqyou.com/

Cool!

[deanbean]

.. but isn't the flatter your tyre the more energy is used to move forward.

 

As in a car the flattert the types the more petrol is used ?

It's counter-intuative, but I read some research done a while back, that lower pressures result in lower rolling resistance on dirt, but not on tar, up to a point.

[carbon29er]

never trust a person that measures pressure in psi

I'd like to know how you can base an aspersion on my character based on the fact that you are probably too stupid to understand why psi is used in this calculation.

[camelman]

The weekend warrior dont really care about the .06 like the snakes do.

At 95kg I don't qualify as a snake. More like a fat anaconda

[Joeboy69]

Ideal MTB tyre pressure depends on a few factors. Most important your weight. Other factors being front or back wheel, 29 or 26, tubed or tubeless, type of riding, experience level. Here is a cool calculator that takes every thing into consideration:

http://mtb.ubiqyou.com/

 

My tyres indicate 1,9 - 3,7 bar so I usually go halfway; around 2,8 bar. Using this tool it suggests 1,8 and 2,0 bar, but that is very close to the minimum so can't be good for the tyre?

 

I have 29" 2,25 tubeless and weigh 85kg

[deanbean]

 

 

My tyres indicate 1,9 - 3,7 bar so I usually go halfway; around 2,8 bar. Using this tool it suggests 1,8 and 2,0 bar, but that is very close to the minimum so can't be good for the tyre?

 

I have 29" 2,25 tubeless and weigh 85kg

I run between 1.4 and 1.8 bar depending on conditions, and have for many years, and don't notice any adverse affects on my tyres. The limits are there to protect the tyre co's from litigation happy mericans.

It's far more comfortable, and traction is better at lower pressures.