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What?! A Fatbike 29er?!

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What?! A Fatbike 29er?!

Old 08-13-15, 08:39 AM
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mdilthey
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What?! A Fatbike 29er?!

So, I was arrogantly laughing at Salsa's Pony Rustler. A 27.5 wheel size with a 3-inch tire? It's the rise of the in-betweeners on the quest for more money!!!


Then I realized, they're going to get my money, too. Sort of.

The 27.5 wheel size with a 3-inch tire has about the same overall diameter as a 700c tire with a 2.2-inch tire. So, most frames can take a 27.5+ tire and wheel! Whoa! A revelation!



Here, you can see a 27.5+ 2.8-inch tire from WTB vs a traditional 29er wheel.

So, over the next month I'm going to get a 27.5+ wheelset built and start testing tires for off-road touring on my Surly Karate Monkey. I think I'm gonna go 2.8 in the back and then get something really meaty up front, like a 3.25, to keep my BB height up. Anyone else do something like this, or plan to?
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Old 08-14-15, 08:40 AM
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Been thinking about it for my specialized enduro, but that's not for touring. Hubs and rims? Both have been blowing up with changes. The new plus sized setups have 110 front and 148mm rear hubs. Currently running velocity p35 rims on my KM, with geax tattoo tires at 2.3" wide, sort of like a hookworm in tread. Toying with the idea of bike packing with my Farley 6. Running some smooth 3.5" v rubber speedsters. Maybe. Need to work out the rack/bag setup for it though. The new rims for the 27.5 + are wide, like 35-50 mm, what are you planning on running?
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Old 08-14-15, 10:04 AM
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I've been touring on a 29+ bike with 3" tires for 3 years now and love it. It rolls fine for 100kms+ pavement days, loves dirt roads and rocks techy singletrack very well due to the large diameter wheel. I can't see myself going back to "skinny" tires for the kind of touring I do.

I haven't tried B+ tires/wheels and probably won't unless I get a FS bike to tour on. However, I don't see any reason not to stuff a set into your KM if you get a BB height you are happy with and there is lots of clearance in the rear for it.



My buddy rode a B+ Rocky Mountain Sherpa on our last tour and he liked it a lot.
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Old 08-14-15, 10:53 AM
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I should add that a 3" tire has far more in common with a normal width MTB tire than it does a fatbike tire. So you get a much more nimble fast rolling wheel, but you lose most of the float that fatbikes have to conquer soft conditions.

For a wide variety of conditions a 3" tire is an amazing compromise between skinny and fat tires that I think makes a great choice, but if you need to ride deep sand/snow there is no comparison to a 4" or 5" fatbike tire.
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Old 08-14-15, 12:09 PM
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RM sure changed the Sherpa in the last few years.
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Old 08-14-15, 08:28 PM
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2.8 in the rear of a KM? Man that would be sweet. I hope it works out.
Front - if you have the clearance in the fork - or get a new fork with the clearance - just rebuild your front wheel with s 45 or 35 inside dimension rim - something like the WTB Scraper or Velocity Dually (or whatever it's called now). Then you can just swap tires. Although a wheel swap is even easier.

Plus is pretty fun. Really happy with my Krampus. SS riding it now. The rohloff wheel will go back on in the fall for some trips.
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