Wrong seatpost in my Mukluk all along!- Mtbr.com
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  1. #1
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    Wrong seatpost in my Mukluk all along!

    I know seatposts aren't fatbike specific but it is on a Muk and this forum gets a lot of traffic, all the shops are closed and its about to snow so I need to know now!

    Anyway, 2 years ago I picked up a floor model Mukluk 2 with some random bits (non holy daryls, full X9, etc). In preparing to order a dropper I was checking the seatpost and realized the shop put in a 30.9 diameter post. The Salsa site says the diameter is 31.6! I've been riding this way for 2 years now!

    I haven't had any issues to speak of but will I? I don't have any 31.6 seatposts and am eyeing up some aluminum cans to make a shim. Has anyone been using shims long term? I'd rather get a $10 shim and be able to swap posts with my other bikes if necessary.

    Thoughts?

  2. #2
    All fat, all the time.
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    There's no way a 30.9 would stay put in a 31.6 frame......

    Did they change the frame sizes over the years?

  3. #3
    RAKC
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    Are you sure the site isn't posting seat tube diameter instead of seat post diameter? No way a 2mm smaller seat post would stay put for 2yrs no issues without shims.

    I know the 2011 version runs a basic 27.2 post.

    And unless shop was trying to run off with the seat post they can't put the wrong on in, the bikes come with all the parts in the box, assemble and go

  4. #4
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    From 2014 Mukluk 2 | Bikes | Salsa Cycles

    Seatpost 31.6
    Seatcollar 35

    I realize now much play the seatpost has compared to my other bikes when the collar is off. Calipers tell me the seatpost is indeed 30.9 and the ID of the top of the seatpost is an oval at 31 front to back and 31.4 left to right despite using a torque wrench to tighten it.

    And to clear it up a bit, it wasn't a stock Muk 2. I'm guessing someone ordered a frame and didn't want it so they built up the bike with takeoffs. I guess the post would slide down a bit every now and then.

    Anyway, are people good with using seatpost shims these days?

  5. #5
    aka bOb
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    Problem Solvers 0.7mm Shim, 30.9 Seatpost to 31.6 in Tree Fort Bikes Seatpost Shims (cat1500)

    It will work fine just but another place for a creek to develop.

  6. #6
    dying hurts.
    Reputation: johnny the boy's Avatar
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    just buy the right size seatpost....

  7. #7
    All fat, all the time.
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    Grease the shim, shouldn't be an issue.

  8. #8
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    Quote Originally Posted by bdundee View Post
    Problem Solvers 0.7mm Shim, 30.9 Seatpost to 31.6 in Tree Fort Bikes Seatpost Shims (cat1500)

    It will work fine just but another place for a creek to develop.
    What Bob said.
    Veni vidi velo!

  9. #9
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    Probably be fine with that shim, but the longer length the better. I cracked an aluminum frame using a shimmed 27.2 in a 31.6, so would not recommend it. I'm surprised it hasn't cracked already. I got an incorrect spec'd bike with a 30.9 post in a 31.6 frame. Didn't last long.

    I just use the right size stuff now. No gambling.

  10. #10
    beer thief
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    Quote Originally Posted by bdundee View Post
    Problem Solvers 0.7mm Shim, 30.9 Seatpost to 31.6 in Tree Fort Bikes Seatpost Shims (cat1500)

    It will work fine just but another place for a creek to develop.
    I shimmed my Thomson post with one of these Problem Solvers to fit my Bucksaw and it works fine. If a creak develops, pull them out and grease them. Has not been an issue for me.

    Quote Originally Posted by johnny the boy View Post
    just buy the right size seatpost....
    Agree. If you're buying a new dropper just get the right size. You may have to gently expand the top of your seat tube if it's been over-clamped for a couple of years.

  11. #11
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    Thanks for the info everyone. My shop came through - inspected the frame and found no cracks, made a note in case of future problems and traded me for the correct size post which fit just fine after the "gentle expansion".

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