Plus size tire pressure....- Mtbr.com
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  1. #1
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    Plus size tire pressure....

    Buddy of mine bought the Pivot 429 Trail and just got a set of plus size wheels & tires. We're heading on a trip to Gooseberry Mesa tomorrow and he wants to try out the new tires. Any idea on what PSI he should be starting at? We're headed out to Guacamole tomorrow How about PSI on the JEM Trail or other "faster" rides like Barrel Roll?

    He is 220 lbs and an intermediate rider.

    Sorry, I forgot to ask which brand/model of tires he bought.
    Carpe Diem!!

  2. #2
    Thin Man on a Fat bike
    Reputation: SAM313's Avatar
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    There is no hard and fast rule and rider weight, type of tires and altitude can all create variables. I weigh about 170 with gear and on a mountain bike with 2.4 tires I run 20 pounds or less in Moab. Essentially you want just enough pressure to avoid getting rim strikes but low enough pressure to take advantage of your full tread width, and maximize traction with lower pressure. If your riding all hardpack it's not as much an issue other than climbs but if your climbing steep rock or loose stuff you want a low pressure.
    I never check my pressure. I squeeze my tires at the trailhead and frequently let air out as my ride progresses, seldom have I needed to add air.
    I would start with enough air to allow the tread surface to flatten when the bike is weighted but not so little to allow the sidewall to deform and work from there.

    It's really rider preference.

  3. #3
    Frame Building Moderator
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    Bring a pump (and a gauge if you have one) with you and see what he likes. Not so hard.

    -Walt

  4. #4
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    Quote Originally Posted by Walt View Post
    Bring a pump (and a gauge if you have one) with you and see what he likes. Not so hard.

    -Walt
    Well, that's the plan. I guess from what I've read elsewhere that we'll start at 20 and go down from there.
    Carpe Diem!!

  5. #5
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    I created a table of starting pressures ... I put some fat tire sizes in there... might help:

    Interdependent Science: Bicycle Tire Pressure

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