Question about racing Fat Bike class- Mtbr.com
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  1. #1
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    Question about racing Fat Bike class

    I have a question for you guys. I have raced my Salsa Beargrease quite a few times over the 3 years I have had it. Most of the races say that they require 3.8" tires. I used to have wider rims/ tires and was never concerned. I now have 27.5x3.8 Hodag's on 45mm rims, and 26" Dillinger 4's on 65mm rims. I don't think either of them measure 3.8", but both say they are on the sidewall.

    Am I skirting the rules/ making a questionable choice to race "Fat Bike" category on these setups?

    I didn't put these wheelsets together with that purpose, but through trying different setups over the years, this is what I have found to be the most fun and capable in my area.Question about racing Fat Bike class-img_5561.jpg

  2. #2
    turtles make me hot
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    That's an interesting question. I'm subscribed. I would think whatever it says on the tires is what it is.
    I like turtles

  3. #3
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    Isn't a minimum 65mm rim and 3.8 tire?
    :thumbsup:It doesn't matter what I ride as long as I ride it Rubber Side Down●~●.

  4. #4
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    If the tire says 3.8 on it, you should be good; both legally and ethically.

  5. #5
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    Is there anyone measuring tires on the start line?
    I doubt it.
    I run Hodags on 50mm rims and never had an issue at a race....especially considering the fatbike class is for shitz and giggles.

  6. #6
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    There are several races in upstate NY that use the criteria laid out here...

    https://en.wikipedia.org/wiki/Fatbike

    This means 3.8" tires and 2.16"(55mm) wide rims.

    I have been wondering about this myself because I wanted a set of 50mm Durocs but they may be "illegal". I have a set of Jackalopes now but they're 80mm and not the lightest. Also, they're no good for riding rock strewn trails because there is no rim protection unless I ride with Barbegazis or Gnarwhals.

  7. #7
    turtles make me hot
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    I've built a few sets of wheels lately with Alex Blizzerks in 70mm. Very light and excellent tubeless. Might be good for some guys.
    I like turtles

  8. #8
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    Will they check your gear IF you are the overall winner?

  9. #9
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    Quote Originally Posted by Forest Rider View Post
    Will they check your gear IF you are the overall winner?
    That's how it works in most racing forms of any type.

  10. #10
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    I did ask one race locally about it. They said that the requirement states 3.8" on the tires, but that the race director could interpret that rule how he saw fit, including measurement.
    This made me ask the question to a wider audience.

  11. #11
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    A rim width spec would make sense. A good race organizer would advertise the requirement and not leave it open to at whim ruling.
    2018 Motobecane Sturgis NX
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  12. #12
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    I have never known it to be anything other than a listed tire size. The Fat Bike Birkie simply requires "at least 3.5" wide tires". It does not say labelled or installed width, but 3.5" probably has one running 3.8" tires covered either way.

  13. #13
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    Quote Originally Posted by timsmcm View Post
    That's how it works in most racing forms of any type.
    So in that case, OP would knowingly run a smaller than advertised tire (by measurement) and likely be disqualified if they were the overall winner.

    OP could say "i didn't know" but the director has to believe that then. I guess the point would be -if you think you will win it's probably best to run a tire that physically measure the minimum requirement and not take manufacturer tolerances into consideration.

  14. #14
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    Quote Originally Posted by ddoh View Post
    If the tire says 3.8 on it, you should be good; both legally and ethically.
    My tires say Snowshoe on the side but they told me last winter not to ride on the Ski/Snowshoe trail near here.

  15. #15
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    I have never seen anybody enforce anything other than what the tire says on the sidewall. With that said - some of the bikes that I have raced against had obviously smaller tires/wheel set up on than I did while I ran the typical 65mm wheel/3.8-4" tires. I just figured if it is that important for people to do well in the fat bike class, they can have it.

    Personally - if I wanted to race a 27.5+ set up, I would enter the regular mtb class with it...

  16. #16
    Professional Crastinator
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    Quote Originally Posted by spartan_msu View Post
    ...Click image for larger version. 

Name:	IMG_5561.jpg 
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    Totally OT...

    Awesome finish on that frame!

    Question about racing Fat Bike class-monitoring.jpg

    -F
    It's never easier - you just go faster.

  17. #17
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    That bike looks well put together

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