30psi..

The Northern Monkey

Feels very hard!!
Just put tyres and tubes on my new wheel and pumped it up to the recommended min of 30psi.
i've always run my tyres a bit low pressure but thought i'd go full wack and put it a 30psi...don't think i'd want to take it upto the max of 50psi, scared of it popping in my face

Whats the lowest pressure you'd use?

Milkie

I tried 60 psi once!

Just the once though! It was not nice, even on the road!

When fitting a new tyre, I'll pump it up nice n hard so the tyre seats correctly on the rim, then let it down to the pressure I want.

At the moment, with the weather the way it is, snow/ice.. I'm running 20psi on the front and 25 on the rear..

As many will say, it really depends on a lot of factors such as the way you ride, your weight, the tyres you have.. etc.

I can get away running these low pressures because I'm pretty light @ 56 kilo's. Also found my tyres feel better at lower pressures (maxxis ignitors 2.1).

.blitz

bigbenj_08 wrote:

Whats the lowest pressure you'd use?

25 psi just for a laugh.

Normally I run 35-40 psi, 80 on the BMX and 100psi+ on my road bike.

KonaMike

30PSI is the minimum I can run or I get continuos pinch flats !

The Northern Monkey

Interesting.
I've been down to 25 psi and never had pinch flats, however have noticed the tyre looking a little saggy. But the extra 5 psi has really filled the tyres up.
Gonna try a bit more pressure, but i think offroad I may drop it a bit for grip.

cheers for the advice about pumping high to ensure they're seated...gonna do that now

bannedbiker

If you like low pressure's, go tubeless.
I run Maxxis highrollers, with over the top big fat heavy tubes, i'd usually run around 25 rear and 22 front.
I've recently converted to tubeless, and i now happily run 22 rear and 18 front.
Like someone else said, it depends on a lot of factors: what tyres your running with what tubes, on what rims, on what bike, how much you weigh, how you ride over what terrain.

petercarm

Whatever pressure gauge you are looking at may be lying.

The minimum pressure depends a lot on rim width (not just tyre width). If you have a cross-country wheel set with ~23mm width, 30psi is pretty low. If you have big, fat rims you can go a lower.

The Northern Monkey

My rims are 4cm wide
I've put 2 different pumps on and had the same reading

Milkie

I think.. cos its wider, therefore more surface area, it requires more force to depress it the same distance as a thinner rim.

(eg tap your finger on a pin or knife edge and it hurts, do it on a desk and it doesn't hurt, cos the surface area is greater)

I think my physics is correct, but it is over 10 years since I did that!

Whatever pressure gauge you are looking at may be lying.

If a gauge reads 30psi on a wide rim and 30 psi on a thinner rim, they are both correct, cos its the volume of air that has changed, not the pressure. Unless you have a crappy gauge, in which case, it may be under reading/over reading, but it shouldnt matter, cos it's consistant.

My 20psi on the front is on a DT Swiss 5.1D rim, the 25 on the rear is a crappy xc rim.

KnightofCydonia

I used to run about 25psi on my old bike but that was cos I fannied around a lot on it and needed some give, but also probably why i screwed wheels up left right & centre. Now I'm weighing 6-7 stone more so i'll probably have a reasonably high psi to begin with. like 45-50? Will find out.

Dr Tinkle

I weigh 14 - 15 stone. My local routes are all roots rather than stone so pinch flats dont occur so much here. In this wet weather I'm running my panaracer cinders and trailrakers at 30 front 35 rear for traction. Any less at the rear and I swim around. Come summer, out come the continental mountain kings and 35 front 45 rear for speed.

fatblokefromwarwick

Been down to 18psi on the front & 24psi on the rear whilst using 2.4 Conti Montain Kings without a problem!

I am a slender 83kg with all me kit on though PMSL 8)

nicklouse

what rims and size tyres?

allthegearnoidea

i'm pretty much the same as Dr Tinkle for weight and psi in my cinders!
like to have mine a bit firmer so i know the tyres not overly flat and wallowy underneath my Fat 4rse! although the gauge on my tesco pump seems to have a mind of its own when it chooses to work!!! but i aim for 35psi in the rear and 30ish up front, run cinders all year round too,

supersonic

Some tyres have far stiffer carcasses than others.

dav1

i run my fire XCs between 35 and 45 depending on the conditions.

dave_hill

I put about that much air in mine (makes squeezing motion between thumb and forefinger).

Oh and I used to run about 120psi when I had a road bike!

MrChuck

I usually does pump them up till they feel right so don't really know, but I do know it's well under 40 and probably less than 30. Fire XC pros and I'm about 12 stone.