Mastodon and tire size- Mtbr.com
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  1. #1
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    Mastodon and tire size

    I have a Standard pro mastodon 100mm. Don't tell anyone, but I am running a bud on it. Per Manitou's chart I am a rule breaker. Chart can be found here...scroll a little bit. https://509cycles.com/2017/05/09/manitou-mastodon-fork/

    No issues so far...am I risking my life? Anyone else risking their life this way?

    So I am planning on building a summer wheelset for my fat bike. Was considering 29+ until I was told I couldn't do that. How much taller is a 29+ than my 26 with a Bud. My bud on 80mm rims is taller then my 29er hard tail's wheels.
    Last edited by urmb; 04-05-2019 at 11:09 PM.
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  2. #2
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    i have the same fork and am running 29+ with 2.8 tires. There will be ample room for 3" tires.

    There is a lengthy discussion in the Mastodon thread.

    https://forums.mtbr.com/fat-bikes/ma...n-1039416.html

  3. #3
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    I wish we could boil down that thread to the most relevant info. Too much bs and infighting.
    I have the pro-std 100 and run a Bud on it.
    29+ wheels set waiting on dry trails with no snow.

  4. #4
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    I've tested a 27.5 x 4.5 studded Gnarwhal(approx 1/4" larger in radius than Lou/Bud) at 15psi in a Mastodon 120 Pro Standard. Airing the fork down revealed that the studs literally just kissed the bottom of the crown. I run it without any issues...YMMV...

  5. #5
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    The standard Mastodon will fit a 29 x 3 Chupacabra ( now called XR2) fine.

    The only tires I've tried that don't fit is the VeeXXL and the 27.5 x 4.5 Gnarwhal
    Once you compress the bottom out bumper, the tire will hit the crown....trust me on that.
    Just letting the air out....they barely clear.
    You can easily put a bottom out spacer in to make them clear....or just have enough air in it that it won't bottom out.

  6. #6
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    Quote Originally Posted by BlueCheesehead View Post
    i have the same fork and am running 29+ with 2.8 tires. There will be ample room for 3" tires.

    There is a lengthy discussion in the Mastodon thread.

    https://forums.mtbr.com/fat-bikes/ma...n-1039416.html
    I actually have the 100 mm. I edited my original post. To confirm, you have the 120mm?
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  7. #7
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    Quote Originally Posted by urmb View Post
    I actually have the 100 mm. I edited my original post. To confirm, you have the 120mm?
    Yes, I have the 120.

  8. #8
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    "The mayor said:
    4 Days Ago
    The standard Mastodon will fit a 29 x 3 Chupacabra ( now called XR2) fine.

    The only tires I've tried that don't fit is the VeeXXL and the 27.5 x 4.5 Gnarwhal
    Once you compress the bottom out bumper, the tire will hit the crown....trust me on that.
    Just letting the air out....they barely clear.
    You can easily put a bottom out spacer in to make them clear....or just have enough air in it that it won't bottom out.". Mayor is your fork a 120mm or ? Urmb

  9. #9
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    I have both standard and EXT forks....and they are set at 120 or 130 ( depending on the bike). The travel doesn't matter ( unless you are removing spacers from under the bottomout bumpers)
    The 100 and up will have the same tire clearance.
    EXT will have 20mm more clearance.

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