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  1. #1
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    What PSI do in need to run tubeless

    I am 230lbs., runnung a 2.35 in the front and 2.1 rear ; single speed , what psi do you recomend to run. there are quite a few rocks and roots where i ride.

  2. #2
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    The Stan's formula works well to start with. Weight (in pounds) / 7. Take the result and add 2 for the pressure in back, -1 for the front.

    I can actually go a little lower than this in front, I am 6'4" and 240 lbs
    Mind your own religion.

  3. #3
    Fat boy Mod Moderator
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    will vary based on the volume of your tires (narrower will need more pressure)... and if you are on a 29er or 26er...

    I would start at the stans baseline and go from there... i'd imagine its much like tuning for tubes... bottom out = add psi... if it rolls to much add air...
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  4. #4
    Swimming thru the Smog
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    Im 230 and run 33 in the front on a 2.3, and 38 in the back on a small 2.2.

    But defenitaly start with the stans formula, gives u a good starting point.

  5. #5
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    225 lbs on a rigid 29 SS and start with 28 front/30 rear on Flows with Raven 2.2's. I usually wind up airing down a little bit during the first mile or so if it's rocky/rooty.

  6. #6
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    I'm 277lbs running Flow's & Maxxis Aspen tires. I run 30 front and rear, maybe i should air up a tad... My local trail has lots of roots, no rocks, and a little sand.
    Chris, 6'1" 275lb clyde, Giant Anthem x 29er w/FULL 2012 XT group, Giant Defy Composite Ultegra. Team Truly Spokin!

  7. #7
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    Oh and my bike is a Giant Anthem 29er.
    Chris, 6'1" 275lb clyde, Giant Anthem x 29er w/FULL 2012 XT group, Giant Defy Composite Ultegra. Team Truly Spokin!

  8. #8
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    30 front, 32 rear

    Schwalbe RoRos.
    My EBB so loud
    I'm mashing...

  9. #9
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    250
    28-30

  10. #10
    Underskilled
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    I am 220-240 ride all kinds of terrain.

    The rims blow off at 40-50PSI, I run everything from 8 to 40 depending on terrain.

    Just make it stiff enough that the tyre does not roll over too much on a corner.
    Why would I care about 150g of bike weight, I just ate 400g of cookies while reading this?

  11. #11
    rock crusher
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    230-235# nekkid

    Easton Havens: Ignitor 32psi fr, Crossmark 34psi rear
    Stan's Arches: Ardent/Purgatory 26psi fr, Ignitor 34psi rear
    Halo Freedom: Purgatory 24 psi fr, Saguaro/AKA 32 psi rear

    All 29ers, plenty of rocks here. Wheels run on FS and HT's, all tubeless

    Larger volume tires and wider rims generally require less pressure (compare road to mountain tires for example).

  12. #12
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    220lb on stans flows, ht, 28-30 front and 30-32 rear...just depends on terrain

  13. #13
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    I'm tubeless on my rigid 26" and normally run 35/35. If I run any less in the front, the tire gets really squirmy on the rim (2.25 tire on a skinny V-brake rim).

  14. #14
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    geax sugarro/ringle black flag pro 29er-210 18-25 both ends based on terrain

  15. #15
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    I'm 225 and run 24 psi up front with 2.4 tire on flows and 28 psi in a 2.2 tire on the rear. Rides fantastic!
    "Some Dudes are built for comfort, others for speed"
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    Spesh Rockhopper 29er

  16. #16
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    I am 6'2" @ 245lb

    Bucket nekked and run Geax Saguaros w/Stans 32F, 34R. A little lower than Stans recommends but the Saguaros have stiff sidewalls so no issues.
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  17. #17
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    Wow... I learned something here today and it validated the "Tech Tuesday" on pinkbike.com that I watched the other day.

    You guys are gonna laugh (and that's ok), I've been running 40 - 45psi for years and always wondered why I wasn't getting the performance out of my tires that others so frequently rejoiced about. Not to mention a very jarring ride... even with full suspension. (I'm 226.)

    The bikes are in dry-dock right now undergoing annual maintenance but you can be sure this is one of the first things I'm gonna play with as soon as everything is back together!!

  18. #18
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    285lbs. I run 30F/35R on my 29er. Maxxis ignitors on Stans Crest Wheelset.

  19. #19
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    I'm 6’-3” and 225# and run 28 front, 30 rear on 26” Mavic Crosstrail and Kenda Nevegal 2.1 F&R with 1-1/2 scoops of Stan’s per tire. No problems yet.

  20. #20
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    I've finally had a few rides on my new 29er since ditching the tubes.

    I've been pretty successful running 25psi in the front and 30psi in the back. 29x2.4 Ardent EXO up front and Ikon EXO in the back. No burps at all and I've done a few 1-2ft drops easing into to it.

    Ghetto tubeless setup on WTB Speeddisc AM 29er rims.

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