Under Pressure

[Cyclist33]

hi

just curious to know what sort of psi goes in your tyres? ive just returned to having a mtb and im just running on what the shop bloke put into the tyres, but curious what the current paradigmatic range of pressures looks like.

thanks

stu

 

[Turbo Rider]

Check the sides of your tires. My road bike tires vary between 80PSI and 115PSI and I keep them at 110PSI to allow for post inflation pssssssssst...also because I prefer the solid feel to the spongy feel, but that's a personal thing

 

[T.M.H.N.E.T]

Check the sides of your tires. My road bike tires vary between 80PSI and 115PSI and I keep them at 110PSI to allow for post inflation pssssssssst...also because I prefer the solid feel to the spongy feel, but that's a personal thing

Maximum pressures on sidewalls have little to do with actual pressures used. I run around 18 FR and 22-25 R on a FS and HT, both 650B

 

[Cyclist33]

yeah i mean i used to run my old ht at higher pressures eg 50 odd psi just wondering if this is awful practice or is it entirely up to me? also is it lower pressure at the front like you would on a road bike?

ta

 

[Turbo Rider]

Maximum pressures on sidewalls have little to do with actual pressures used. I run around 18 FR and 22-25 R on a FS and HT, both 650B

I don't know what those bits you said mean All I know is they expressed a range so I went for it. Have I made a booboo?

 

[T.M.H.N.E.T]

Where are you riding it? That dictates pressure more than anything

 

[Cyclist33]

Where are you riding it? That dictates pressure more than anything

oh just light trail at the mo.

 

[T.M.H.N.E.T]

I don't know what those bits you said mean All I know is they expressed a range so I went for it. Have I made a booboo?

Not really.

FR - Front
R - Rear
650B or 27.5inch is one of 3 tyre sizes in MTBing. 26inch 27.5inch and 29inch
HT - Hard tail
FS - Full suspension

oh just light trail at the mo.

If you're not launching it into rock gardens or anything running 30-35 if not slightly higher wouldn't be absurd.

 

[Turbo Rider]

Not really.

FR - Front
R - Rear
650B or 27.5inch is one of 3 tyre sizes in MTBing. 26inch 27.5inch and 29inch
HT - Hard tail
FS - Full suspension


If you're not launching it into rock gardens or anything running 30-35 if not slightly higher wouldn't be absurd.

A, phew - learned something new as well - cheers for that

 

[Racing roadkill]

60 odd psi (4 to 5 bar) in the Cross trail pneumatics, 110 psi (7 or 8 bar) in the Roady pneumatics.

 

[Pale Rider]

I'm a biggish lad, so 55-60psi in the back of the new Cannondale MTB and about 10psi less in the front.

The shop sent it out lower than that, but I detected some squirm from the back on hard surfaces.

 

[Slioch]

I've got two sets of wheels/tyres for my MTB which I swap about depending on what I'm doing.

90% of the time I'm on road and/or gentle tracks, and I've got a non-knobbly (smooth rolling) set of tyres which I run at 60psi

I've then got a set of full knobblies which I use for serious offroad stuff/trail riding/snow etc. I generally run these between 30 - 50 psi depending on conditions.

 

[razer17]

I run mine at 40psi, but I'll probably do some experimenting when I get a new bike to see what the best pressure is.

I run my road tyres as close to the max psi as possible, about 120 I think, since I'm a heavier rider.

 

[Cubist]

25 fr 30 rear on both bikes, HT and FS. HT is 26x2.25, FS is 26x2.4. Both bikes have tubeless Nobby Nic Snakeskins. I'm 16 stone plus.

 

[Cubist]

I'm a biggish lad, so 55-60psi in the back of the new Cannondale MTB and about 10psi less in the front.

The shop sent it out lower than that, but I detected some squirm from the back on hard surfaces.

You'll be skipping about on hard surfaces, and losing grip on hardpack stuff...... you may detect a bit of squirm, but the tyres won't be working with your suspension at those sort of pressures. Unless you're permanently on tarmac fully loaded, try dropping a few psi at a time and see how much your grip improves. The tyre knobs need to be able to conform to the trail, and much more than 40 psi won't let them do that.