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Thread: wat psi?

  1. #1
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    wat psi?

    wat psi should i put my mtb @? i hear its like 50 but isn't the too much?

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    Footballus vita est iamlucky13's Avatar
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    i wud sa n e were between 35 and 50

    Sorry, just wanted to point out that typing in "AOL'ese" makes it harder for us to read and therefore, harder to help you. Taking an extra second to spell words out helps everyone.

    35-50 psi is typically a good range. It depends mostly on the type of riding. If you ride mostly roads, run it closer to 50 psi. If you're riding in soft or sandy dirt, you'll want the lower pressures to give you better traction.
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    Giggity giggity! Dirtbike's Avatar
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    It depends on how much you weigh, and what type of riding you do.

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    We drive on the left. Dutchy's Avatar
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    I like a hard ride so I put 50psi in the rear and 60psi in the front using 26x2.0 tyres. I figure the front tyre can have more air as the suspension takes out the harshness. I ride mainly on fire tracks which aren't that bumpy. The type of terrain can be the deciding factor. But it's also personal preference.


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    I drink your MILKSHAKE Raiyn's Avatar
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    Quote Originally Posted by iamlucky13
    i wud sa n e were between 35 and 50

    Sorry, just wanted to point out that typing in "AOL'ese" makes it harder for us to read and therefore, harder to help you. Taking an extra second to spell words out helps everyone.
    Kid should be happy you got to him first. I'm in a mood to chew on an AOL'er tonight

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    Senior Member matheprat's Avatar
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    In my mountain bike, I have around 50 PSI, and use it for jumping, freeride, light dh etc, most things really
    Trials bike anything between about 15 and 30 PSI, depending on terrain/moves etc
    BMX about 80 or 90
    Road bikes 110
    For my other bikes, and generally at work, I pump tyres up to around 40 (depending on the particular bike and pressure guidelines on the tyre sidewall)
    50 PSI sounds about right to be honest, but check your tyre first.

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    Throw the stick!!!! LowCel's Avatar
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    It depends on what tires you are running and what terrain you are riding. Tubes or tubeless?

    On mine I generally run between 36 - 40 in the front and 38 - 42 in the rear. This is with continental explorer / escape tires using Stan's no tubes. This is for rocky, rooty singletrack where traction is very important.
    I may be fat but I'm slow enough to make up for it.

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    i ride both dirt but mainly road w/ fat tires. i put it at like 40. good?

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    Senior Member arboc!'s Avatar
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    usually it says on the side wall the ideal psi

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    Footballus vita est iamlucky13's Avatar
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    Quote Originally Posted by Raiyn
    Kid should be happy you got to him first. I'm in a mood to chew on an AOL'er tonight
    I saw the clouds gathering and felt it was my duty to do a good deed.
    "The internet is a place where absolutely nothing happens. You need to take advantage of that." ~ Strong Bad

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    I drink your MILKSHAKE Raiyn's Avatar
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    Quote Originally Posted by iamlucky13
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    Throw the stick!!!! LowCel's Avatar
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    Quote Originally Posted by BlkHawkDown
    i ride both dirt but mainly road w/ fat tires. i put it at like 40. good?
    40 psi sounds pretty low if you are not running tubeless. You are just asking for a pinch flat. If you are riding the road then you should go with a lot higher pressure to lower the rolling resistance.
    I may be fat but I'm slow enough to make up for it.

  13. #13
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    Quote Originally Posted by dirtjumpP.1
    usually it says on the side wall the ideal psi

    Uh....no - it usually gives you the acceptable range of pressure (ie. 35PSI - 60PSI.)
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    Quote Originally Posted by LowCel
    40 psi sounds pretty low if you are not running tubeless. You are just asking for a pinch flat. If you are riding the road then you should go with a lot higher pressure to lower the rolling resistance.
    i do both 50/5.0 40 is low?

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    The Rabbi seely's Avatar
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    I run 38 on my XC bike and singlespeed, 32 on my freeride bike. Low pressure = better ride. Unless you are using really small tires, or a lot heavier than my 155lbs, I wouldn't worry about pinch flats. I have NEVER had one.
    commuter turned bike mechanic turned commuter (also a Velocity USA employee, but this is my personal account)

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    la vache fantôme phantomcow2's Avatar
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    40 for dirt and road? Sounds low to me. If your using knobbies on road i would look at the 60's. If you wnat the most efficient machine use slicks for road .
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    To each their own, and terrain and tire choice has everything to do with it. But my impression is many I ride with pump their tires up too high.

    On my 26" bike (2.4" Mutanoraptor/2.1" Traction Pro) I ride 30 psi front and 40 psi rear.

    On my 29" bike (2.1" Nanoraptors) I ride 28 psi front and 38 psi rear.

    FWIW, I weight 200 pounds.

    This is a nice balance where I don't get killed on rocks but can maintain traction up most climbs.

    It's important not to go too low or you'll be in danger of snake bites and bent rims.

    An easy way to adjust it to start with 45 or 50 psi, but leave your valve caps of and your stems open. Every mile or so reach down a release a quick pfffttt of air. Pay attention to how the rear hooks up on climbs, and how the front tracks on the downhills. You'll know when you go to low because the bike will feel squishy and have some side-to-side "flex". Plug a tire guage in and read what pressures you ended up at. Continue to play with your pressures in small increments. Higher for tacky and smooth rolling trails. Lower for loose, steep and dry.

  18. #18
    I drink your MILKSHAKE Raiyn's Avatar
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    Confused yet?

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    la vache fantôme phantomcow2's Avatar
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    If im goingg offroad i like it around 40-45 for the rear and 35-40 for the front. BUt if its at all wet im looking at 40 at the max for the rear and front usually at low 30's
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  20. #20
    Throw the stick!!!! LowCel's Avatar
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    Quote Originally Posted by BlkHawkDown
    i do both 50/5.0 40 is low?
    If riding the bike on the road then yup, forty psi is very low for that. As for on the trails if you are running 40 psi with tubes then you are increasing the risk of snake bites. Of course all tires and trails are different so it is always a judgement call.
    I may be fat but I'm slow enough to make up for it.

  21. #21
    Gravity Is Yer Friend dirtbikedude's Avatar
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    WOW!!! must feel like ya'll are riding on steel tires.

    In sandy conditions I run between 18 and 22 psi, hard packed, and rocks I run 25 to 30 depending how big the drops are (2.5 NBX tires). As for snake bites, I have had 3 in 10yrs of riding/racing and I use tubes and I weigh in at 265lbs.

    What it comes down to is how the bike feels to you. I would suggest trying different psi and decide which feels wright for your style/type of riding. Higher psi will give you less rolling resistance but less traction, lower psi will give better traction but higher rolling resistance.


  22. #22
    Throw the stick!!!! LowCel's Avatar
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    Quote Originally Posted by dirtbikedude
    WOW!!! must feel like ya'll are riding on steel tires.
    Nope, tires feel great with low rolling resistance. I generally run 38 - 42 pounds in standard Continental Escape and Explorer tires with Stan's no tubes. Tires feel great, great traction and very fast. Corner great as well. Keep in mind this is for xc racing not downhill. Around here people running less than 30 psi with tubes flat constantly. I've had the privilidge of watching plenty of people change tubes. WV isn't exactly equipment friendly.
    I may be fat but I'm slow enough to make up for it.

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    Okay, I put it at 50, both tires.

  24. #24
    Gravity Is Yer Friend dirtbikedude's Avatar
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    Quote Originally Posted by LowCel
    Keep in mind this is for xc racing not downhill. Around here people running less than 30 psi with tubes flat constantly. I've had the privilidge of watching plenty of people change tubes. WV isn't exactly equipment friendly.
    I realize that but even when I used to race xc I never had a need for more then 38psi. Just don't like how the bike feels. As for equipment friendly trails, I/we stay away from those 'cause they are not as fun and a lot of riders pinch flat as well.


  25. #25
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    Quote Originally Posted by LowCel
    40 psi sounds pretty low if you are not running tubeless. You are just asking for a pinch flat. If you are riding the road then you should go with a lot higher pressure to lower the rolling resistance.
    I only run 25 psi in the front tire of my Kona and 35 psi in the rear tire. But then I use DH tubes and tires that are 2ply.
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