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Hi,
I have recently converted to tubeless, I am using on one chucnky monkey up front and smorgasboard on rear. I weigh about 16.5 stone. What kind of pressures are heavier riders running. I keep hearing of people my size running mid 20's but im only running a few psi less than what I ran tubed. I realise that it can be different for everyone but just trying to get a rough idea from other 16 st plus riders
A few psi around twice your weight in stone is a pretty good range for typical tyre sizes and levels of shredding. So 33 psi wouldn’t be at all strange for you - lower with heavier carcasses, wider tyres, wider rims, foam inserts, not minding squirm or rarely pulling big G in berms (and vice versa).
Where are you riding?
On what bike?
How hard / aggressive / dufus a rider are you?
I'm 14st, on HT, on rocky trails mainly in Scotland, I'm pretty ok with staying smooth, but I can batter into things at speed. BPW in the summer I was top 1/3 on Strava, on the HT, as a speed indicator.
I'm usually mid 20's plus to stop feeling the rim on big bumps.
Yeah. I find that trying to go under 30 is really mushy. But I keep hearing of 16 stone plus guys using it. I woas running 33 f 36r more or less with tubes. Tubeless now 30 33... Maybe im just not used to being able to do it
some folk seem to have a thing about running low pressures. Ok my bike is old fashoined and thus has narrow rims which need higher pressures but at 12 stone I run 28/32 roughly. ~anything below that feels horrid as it squirms around
I don’t like the feeling of really low pressures, I lose confidence in being able to push the bike hard into corners etc. Don’t be afraid to try lower and see if you get used to it. Also, if you’re going by the psi on your pump, it could be MILES out - mechanical gauges are often rubbish at MTB pressure.
Mid 20s in dry, low 20s in the wet, sometimes lower. 14st and 2.5/2.4 on 30 mm IW rims.
I'm 102kg and run 18/19 in the front and 20/22 in the rear. Maxxis minions 27.5, 2.5/2.4wt exo carcass on my full suss.
30/32 about right at that weight IME - you can easy go lower but depends where you're riding. Any sustained rockiness will start to ding the rim / risk a flat.
Also depends on why you're riding - low pressures are often to do with squeezing maximum grip out of the tyre in a race or other competitive situation. This isn't that relevant for most folk so running pressures that are going to be reliable over mixed terrain on a 3 or 4 hour MTB ride is a better bet.
I'm 17 stone and was told by the folk a mojo rising that I really should be running dh casing on my bike if I wanted to run under 30 psi as I was having issues with tyre squirm. So I changed my rear tyre to a DH casing and it made a heck of a difference I know run about 28psi and have no squirm. Rear is much more stable.
I ran 20 psi max on rear 2.8” crappy NNs at 18st here
Now running 35 front psi and 40 rear psi at same weight on 2.35” Forekasters
Thing is I measured the plus pressure on digi gauge but floorpump only reads my 2.35” tyres so :/ if that accurate tbh
Then there’s a small fact of my rear tyre rubbing my frame if less than 40psi as only 1mm clearance if that lol
24fr 30/32rear on on 2.4 hr2s exo, 26". I'm 18st+. thats with tubes.
It does depend on terrain you are riding / tyres / rim size / weight / style.
I’m 12.5 stone ish and have 30mm I’d rimsmom there fs with a 2.5dhf at / 2.3
Aggressor most of the time. Tend to run low 20’s up front and around 25 at the back - but only according to the gauge on my Lezyne pump so probably not accurate. Any lower can get squirmy.
On the hardtail I run broadly the same pressure and they are 25mm I’d rims with a 2.4 chunky monkey front and a 2.25 Smogasbord on the back.
If I’m going anywhere rocky I sometimes put a few psi extra in at
Both ends - and for Antur Stiniog I put a thicker casing tyre on the back. No inserts tried so far as I haven’t felt I need them as I think I’m quite light on mtb wheels.
The generic formulae are just a starting point. I wouldn't worry about the actual value, just what feels right for the riding that you do.
Basically if the tyres feel squirmy then put some air in, if you are pinging off everything let some out. Hopefully there's a range between the two that you can use.
16st here... I ride with 25PSI in my Maxxis DHF and DHR II's (2.35") on my full-sus, and 30PSI in my Onza Canis (2.25") on my hardtail.
Any less in the Onza's and they feel squidgy, I've ridden with 20 PSI in the Maxxis's (when I forget or don't have time to pump them up before a ride) and they feel fine.
"Basically if the tyres feel squirmy then put some air in, if you are pinging off everything let some out. Hopefully there’s a range between the two that you can use."
And if there isn't, then heavier casings and/or foam inserts will help.
It depends, but somewhere between 20 and 30, I'm 80-85kg, fairly light on my feet but do smash through things from time to time. Run procore on the rear if I'm planning on anything really rocky, especially on the HT.
I don't find it gets squirmy, but I do wonder about friends who use procore to allow them to run ~15psi.
100kg here - used to run 25/27 front/rear. I recently got some Rimpact foam inserts, and I'm now able to run 17/22. I'm now getting frankly ridiculous levels of grip, but with plenty of carcass support from the foam so very little (if any) squirm.
I’m 110kgs and ride Around 25ish in the front and rear. Maxxis DHR 27.5, 2.5/2.4wt exo+ carcass on the F/S trail bike.
I sometimes run a bit less on the Maxxis shorties in the winter, as I’m never smashing as much as when the trails are dry.
In 5 years of tubeless, I’ve not yet dinged a rim.
Like others have said, it totally depends on the tyre size, casing and rim. I have a history of destroying rims and this is based on pressures that were said in magazines to be the 'ideal' at the time. However, I have learned for my style and the terrain I ride I just cannot run the low pressures being quoted in some posts.
80-85kg, Park Tools track pump gauge
FS:
Rear - Stans Flow Mk3 (30mm), 26x2.35 Nobby Nic Snakeskin, 30-32 PSI
Front - Stans Flow (25mm), 26x2.35 Magic Mary Snakeskin, 22-24 PSI
HT:
Rear - Hope Tech Enduro, 29x2.35 Nobby Nic Snakeskin, 32-34 PSI
Font - Hope Tech Enduro, 29x2.35 Magic Mary Snakeskin, 20-22 PSI
Anything less and I ding a rim.
I've just aquired a Nukeproof ARD insert which i'm going to try in the HT rear and see how much air I can let out as an experiment over the winter.