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  1. #1
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    27.5 +? not

    Is there any reason why we can't use 27.5 + wheelset on a 2014/15 Mukluk.

  2. #2
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    Why not? I'm planning to do it on my Bucksaw.

  3. #3
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    One concern is bb height. Look at the diameter of the tires you intend to use compared to the fatty tires. I think you'll be a little lower, until they come out with a wider range of tires and some slightly chubbier ones.

  4. #4
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    Quote Originally Posted by idinomac View Post
    Is there any reason why we can't use 27.5 + wheelset on a 2014/15 Mukluk.
    I guess no, but it might be easier when more tires are available in this size

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  5. #5
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    I kind of got the idea from the Bucksaw and the new Pivot fat bike. Pivot uses a rear dropouts that have an ark to it to bring the bike up as well as a thicker bottom headset cup. I have already contacted Salsa about how easy this could be done on the Mukluk a thicker bottom headset cup and a little longer alternator on the rear of the bike.. But then I got to thinking that I heard 27.5 + is about the same as 29er.

  6. #6
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    And yeah, the none availability of the 650B/27.5 + size tires is the killjoy to this idea. I live in northern MN. But I'm staying in Florida till the ice is off the lakes. I'm riding lots of single track on my Mukluk it beats the crap out of me hitting all the roots & I miss my Spearfish some but I sold it to help pay for my wifes Mukluk. The good in that is she loves her new bike and wants to ride more than ever.

    I have a few ideas rolling around in my head like get rid of my Mukluk frame and get a Bucksaw frame but that's a big bike that I would want for the dirt mostly and so I would want the 27.5 + wheels and tires 99% of the time or go with a Horsethief.

  7. #7
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    27.5 +? not

    I'm not sure about the 27.5+, but a lot of people are building 29+ wheels for their mukluks, if my income could keep up with my bike addiction Id build up a set of velocity dually 29er wheels for mine.

  8. #8
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    Overall Wheel Diameter

    Mukluk with 3.8" tires on stock rims = (approx) overall wheel diameter of a Mukluk with 3.0 27.5+ tires on ISO584 rims (27.5" rims).

    In other words, a fairly direct swap from your standard fatty wheels to 27.5+ with little to no geometry changes. It isn't an "exact swap in terms of the numbers, but it is very close. Both wheel sizes are approximately 29".

    29+ is approximately 31" in diameter, so when you swap to those wheels in a Mukluk, you are changing the geo significantly.

    A better candidate for a 29+ swap in a fat bike is any fat bike that was designed around 4.8" tires, like the Blackborow. 4.8" tires and Clown Shoes are approximately 31" in diameter, much like a 50mm wide rim/Knard 3.0 combo (29+)
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  9. #9
    since 4/10/2009
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    Quote Originally Posted by Guitar Ted View Post
    Mukluk with 3.8" tires on stock rims = (approx) overall wheel diameter of a Mukluk with 3.0 27.5+ tires on ISO584 rims (27.5" rims).

    In other words, a fairly direct swap from your standard fatty wheels to 27.5+ with little to no geometry changes. It isn't an "exact swap in terms of the numbers, but it is very close. Both wheel sizes are approximately 29".

    29+ is approximately 31" in diameter, so when you swap to those wheels in a Mukluk, you are changing the geo significantly.

    A better candidate for a 29+ swap in a fat bike is any fat bike that was designed around 4.8" tires, like the Blackborow. 4.8" tires and Clown Shoes are approximately 31" in diameter, much like a 50mm wide rim/Knard 3.0 combo (29+)
    I've got a friend who ran 29+ in his Muk last summer, and didn't like the change in handling on the bike. I agree that a b+ setup would be pretty close to a direct swap with a 26x3.8 setup, just a little bit lighter.

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  11. #11
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    A Saturday morning brain-dump for you all:

    In theory, 27.plus is a great option as an alternative wheel in a our Mukluk or other 170 fatbikes. What you want to watch our for is overall tire diameter. The Mukluk (& our other 170 fatbikes) is designed around a ~740mm wheel diameter. Both 26x3.8 and 29x2.25 tires measure 740mm (+/-5mm or so). A true 27.5-plus tire that provides a solid no-compromise 3rd wheel-size option in the Muk' would also in theory have a similar overall diameter.

    Most of the 27.5-plus tire options I have seen to this point are in the 68-72mm width range (2.75in) and ranging from as short as 715mm to as tall at 727mm. In my opinion these are not really "-plus" tires so much as biggish 27.5 tires. The drastically smaller overall diameter will definitely affect the BB height of a Mukluk (as well as most 29ers that in theory are also designed around 740mm). Now that doesn't meant these tires/wheels won't work, (they'll go around just fine) it just means you need accept and account for a lower bottom bracket and pedals that are closer to the ground and trail obstacles. Some people will adapt just fine, others might find a 5mm shorter crank helps to compensate.

    I suspect part of the diameter issue with the current options is related to the "narrow" overall tire width of just ~70mm (2.75in). A true "-plus" tire at a ~76mm (3.0in) width and a casing/volume like Surly's category-defining Knard should in theory come out closer to a diameter of 735mm give or take a few millimeters. This is much more on par with the 740mm diameter the frames are designed for, and is even on par with the lower knob'd 26 x 3.8 tires like the Knard, Larry, & HuDu, which most are familiar with on their Mukluk or other fatbike frames.

    So in summary - Yes, 27.5-plus is a great wheel/tire option for Mukluk or our other fatbikes. The current options are a little undersized in both the width and more importantly diameter department. Although not a functional problem, this discrepancy will affect BB height and pedal clearance, which the rider may or may not notice. I'm optimistic we will see some "true" plus size/volume tires (76 x ~735mm) in the future that will provide an even better alternative with fewer compromises to BB height and steering feel.

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    Last edited by Zarf; 03-14-2015 at 09:50 AM. Reason: spelling

  12. #12
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    A Bucksaw owner has built a set of Nextie 27.5 x 40mm wheels with Vee Trax Fatty 27.5 x 3.25 tires he measured at 746mm dia. This is a true + setup IMO. Panaracer has, or is close to releasing a 27.5 x 3.5 Fat-B-Nimble tire. Looks like more choices will be available in the future.

  13. #13
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    Given that my experience with fatties around here meant great riding until you hit fresh powder (then you need a 5" fatty), my guess would be that a 27.5 + option hardtail like the El Mar would be ideal.

  14. #14
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    Quote Originally Posted by AZMB'er View Post
    A Bucksaw owner has built a set of Nextie 27.5 x 40mm wheels with Vee Trax Fatty 27.5 x 3.25 tires he measured at 746mm dia. This is a true + setup IMO. Panaracer has, or is close to releasing a 27.5 x 3.5 Fat-B-Nimble tire. Looks like more choices will be available in the future.
    The Fat B Nimble measure 733 mm according to Dirt Rag. So your BB drops about 3 mm from a 740 mm tire.

    For most bikes and riders this should not be a problem.

    mike

  15. #15
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    Quote Originally Posted by senor_mikey View Post
    The Fat B Nimble measure 733 mm according to Dirt Rag. So your BB drops about 3 mm from a 740 mm tire.

    For most bikes and riders this should not be a problem.

    mike
    Yes, I saw that, kinda confusing as they measured the tire on a bare Scraper rim. Does that mean there was no air in the tire??
    Also odd that the Vee 3.25 measures 746mm dia and the FBN 3.50 (supposedly) measures 733.3mm.
    I get a headache trying to make sense of these tire specs vs whats real.

  16. #16
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    They fit fine. Salsa is updating the FAQ to add 275+. It will be slightly higher than stock depending on the hoops and wheels. 29+ sit even higher. It's probably the best option for summer wheels on fats right now.

  17. #17
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    Anyone know if 27.5 x 3.8 variety will fit out back on the 2014 mukluks?

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