tubeless psi query

lucifuge
Posts: 67
Joined: Mon Apr 25, 2011 7:43 pm

tubeless psi query

Postby lucifuge » Sun Dec 18, 2011 8:47 pm

I'm running Panaracer Fire XC 2.1's on my 26" dually in a tubeless setup. The sidewall rating has a minimum of 35psi. Now I note by searching the web that people are running pressure as low as 20 psi on their 2.1's (not necessarily Panaracers). My question is, can I run lower than 35's or is that asking for trouble?? At 68kg, I thought maybe I could go lower? thoughts?

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skull
Posts: 1968
Joined: Thu Oct 11, 2007 9:48 pm

Re: tubeless psi query

Postby skull » Sun Dec 18, 2011 8:57 pm

I have dropped down below 35 on mine, I am a 85kg rider. I haven't had any issues when going so low, the only drama is the ride to and from the trails to my place is roughly 10kms. So at the end of a ride I usually cannot be bothered pumping them up and ride home on the road with low pressure

btothec
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Re: tubeless psi query

Postby btothec » Sun Dec 18, 2011 10:03 pm

Weigh around 85 kg and run mine between 30-35 psi with no issues at all.

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toolonglegs
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Joined: Fri Jun 29, 2007 7:49 pm
Location: Somewhere with padded walls and really big hills!

Re: tubeless psi query

Postby toolonglegs » Sun Dec 18, 2011 10:17 pm

Run about 28psi at 110kgs including bike weight...no issues.
Can't do the same with cyclocross tyres though :oops: .

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trailgumby
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Location: Northern Beaches, Sydney

Re: tubeless psi query

Postby trailgumby » Mon Dec 19, 2011 9:19 pm

I run my Nobby Nic UST 26x2.25 front tyre on the dually at 24-25psi. Any more pressure than that and it's downright sketchy. The rear is a 2.1 Racing Ralph which I run at between 28-32psi depending on terrain. I'm normally about 82kg with full 3L Camelbak, shoes, helmet and kitchen sink.

The digital gauge was showing the Michelin XCR Dry2 26x2.1 on the front of the hardtail at 17.1psi on the weekend... but I think it was lying. It certainly didn't feel that soft when I squeezed it by hand, but then it's not as thin and pliable a tyre as the Schwalbes... so I dunno.

Prior to switching the dually to Schwalbe rubber I used to run a Maxxis Ignitor 26x2.35 on the front at about 30psi and a Larsen 26x2.0 on the rear at 32.

Bear in mind these are UST tyres, which are normally very tight to get on UST rims. They have to be to seal, which they do without sealant. If trying this with non-UST kevlar beaded tyres you run the risk of burping your tyre off the rim if you run it too soft. I wouldn't want that to happen on the front at speed.
When all else fails, persistence prevails -- Lew Hollander

lucifuge
Posts: 67
Joined: Mon Apr 25, 2011 7:43 pm

Re: tubeless psi query

Postby lucifuge » Fri Dec 23, 2011 7:27 pm

tried 26psi on my dually (AT) Stromlo the other day, felt really good!

....... will try it (AT) Kowen/Sparrows on both my bikes and see differences there.

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trailgumby
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Location: Northern Beaches, Sydney

Re: tubeless psi query

Postby trailgumby » Mon Dec 26, 2011 1:04 pm

Ooh, Kowen.... jealous. I'm just starting my training program to get ready for The Mont. Really enjoyed myself there last year.
When all else fails, persistence prevails -- Lew Hollander

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