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Fat bike on dirt - tire PSI?

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  • Fat bike on dirt - tire PSI?

    I just got a fat bike. I can't wait for winter, but I am using it in the dirt as well. I got the Motobecane FB-4, which was an amazing deal, even after putting $200 worth of upgrades into it (I instantly feel like I have to justify buying a Motobecane :-D).

    It came with 72 TPI Vee Tire Mission tires which are close to Surly Larry tires in tread pattern. I started off at 10PSI and have worked my way down from there. I ended up at 5.5PSI (I measured after my ride) which was too low, I felt the tire hit the rim a few times and made me ride timidly. Just wondering what any fatbikers who are riding in the dirt are running your tires at. I was at 8.5PSI for last night's ride and it was pretty harsh, going for 7.5 for the next ride.

    A little eye candy:




    Big Strings, Big Wheels, The Jisch Blog

  • #2
    I have a Moonlander with 120 tpi BFL's. I set it up tubeless. These tires are very supple. My tire pressure on dirt,single track
    Is 4.5 lbs set with a low pressure gauge. I've never bottomed out the tire.

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    • #3
      I've got some On-One Floaters on order, as soon as they get here I'm going to set them up tubeless. Thanks for the info.
      Big Strings, Big Wheels, The Jisch Blog

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      • #4
        By the way, I set mine up ghetto tubeless. Was a piece of cake. Inflated with a floor pump.
        Where do you ride? I'm mostly at the Landlocked forest, Great Brook,Callahan and my favorite, Trail of Tears.

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        • #5
          Love the single track on a fattie

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          • #6
            That Motobecane is an incredible bargain. A friend just got one, and he let me ride it. Sighhhhhh. Now I'm in the market too.
            Depending on your body weight, 4-9 pounds would probably work.

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            • #7
              I don't have an accurate pump, but inflate until I can just barely not hit the rim as I roll over an edgewise 2x4. Guessing it's in the 5 psi range. Banged the Holey Darryls a couple times on rocks and stuff, but have only pinch flatted once in nearly 3 years. Using the On-One floaters currently.
              PVNEMBA - Riding at its BEST
              http://www.facebook.com/CharlemontTrails

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              • #8
                I got a small digital gauge that reads in .5 PSI increments, my regular pump doesn't read down that low (its not even close).

                The Motobecane is an incredible deal. There are some stinker parts in there (headset, QRs), I swapped some right away, but I'll swap the rest as they break. So far I am VERY pleased with it. After swapping tubes and cassette I'm under 35 pounds, which is downright svelte for a fat bike.
                Big Strings, Big Wheels, The Jisch Blog

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                • #9
                  Pinch flat at 7.5PSI, damnit. Luckily it happened 20 yards from the parking lot. I'll have to go to 8psi.

                  Oh and TheCanoe - I live in Northeast CT. Ride many places around here, Snip, Case, Crandalls, etc, etc. I am lucky that I have a dozen places within a half hour drive from here.
                  Last edited by Jisch; November 11th, 2013, 05:24 PM.
                  Big Strings, Big Wheels, The Jisch Blog

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                  • #10
                    Nice looking bike.
                    How long ago did you order it? Web site says shipping to start Feb 2014 is that accurate?

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                    • #11
                      Thanks, I got lucky (apparently). I was considering buying a fat bike this year and I was cruising the MTBR Fat bike forum randomly back in October and saw mention that bikesdirect was putting out a fat bike. The details on the website were a bit sketchy, and they had some stupid "like us on facebook, post this picture to your timeline and give us your email address" thing you had to do to get in line. In three weeks or so I got an email saying I was next in line and I had to pay in full within 24 hours to get a bike. I had to quickly get approval from the finance department (had to escalate to get a decision that fast) and about 6 weeks later they delivered my bike.

                      I paid $899 for it and added about $250 of parts to it, including some new lighter tires. It rides great. Love the bike! Sorry I didn't give money to a LBS, but sometimes you have to work within a budget. I know bikesdirect has a lot of detractors, but if you know what you are getting, their bikes are usually a good deal. there's a long thread over at MTBR that describes where this bike came from (its actually designed by a company in Norway and the design was kind of stolen by the China factory where its built).

                      I understand their next shipments will come in February/March.

                      There's another low cost option here: http://framedbikes.com/v2/bikes.html#fat, but I haven't seen ship dates for them yet.

                      John
                      Big Strings, Big Wheels, The Jisch Blog

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                      • #12
                        Thanks for the info, I actually like the looks of the Moto's. Enjoyed your blog as well.

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                        • #13
                          Just to follow up as I get more experience with this bike - I bought some On One Floater tires for it, drastic improvement. If you're planning on riding a fatty on dirt, I would plan on upgrading those right away, its that much better. And just about every lower priced fat bike has those same Vee Mission tires on it.
                          Big Strings, Big Wheels, The Jisch Blog

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