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Mullet Fatbike

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flag ScJaGu
Posted: May 25, 2022 at 2:02 Quote
Any tried their fatty with mixed wheel sizes? Doing a 1000km+ in the pyrenees on my Surly ICT, and wondering if a 27+ or 29+ wheel in the back, would give fast rolling, with the control and cushioning of my 26x4.8 in the front. With some thought total diameter could be pretty similar so geometry would not be overly affected.
Any thoughts..?

ps. Also considering a full 27.5x4.0 setup if anyone is selling.
flag mark027
Posted: May 25, 2022 at 4:01 Quote
Never done anything that long myself, good for you. First question I’m thinking is what kit support you have? Personally I’d think keeping the same size tires would make it easier for flat tires. I mean if you had a 3.8 and a 4.5 if that’s your thing the tube would fit both. Or if you stick to both 29+. 27+ seems a waste to me.
I like 3.8 a lot and people seem to love 29+.
flag Jim-Lightcarbon
Posted: Jun 9, 2022 at 20:20 Quote
Generally speaking, people use mullet wheel with large wheel diameter at the front and small wheel diameter at the back, so that the front wheel has better ability to pass through obstacles and grip the ground, and the rear wheel has better rolling and flexible steering ability. However, this will cause two problems. The first is the change of the geometric angle of the frame. You need to adjust the seat, steam, handle, and even the posture when riding to adapt to the change of the center of gravity. The second is that imbalance may occur on level roads and uphill slopes.

If the front wheel has a small diameter and the rear wheel has a large diameter,
Sacrificing the balance of the geometric angle of the frame, what do you want to achieve? The level road or uphill may be unbalanced, and the downhill make the people with bike are easy to roll together ?
So far, the mullet wheel I have sold has not been the one with small wheel diameter in front and large wheel diameter behind. Maybe it is because the carbon fiber wheel set I have sold has not encountered this new requirement.
flag solarplex
O+
Posted: Jun 20, 2022 at 14:44 Quote
on the facebook trek farley fanpage a guy did a 27.5x26 mullet. just finished a week or so ago i seen? not sure how it works or reacts. I had a farley 6 and now a 9.6 and the 26x4 was for sure more playful and easier to wheelie.
flag Staktup
FL
Posted: Jul 26, 2022 at 8:59 Quote
If you run a 27.5 up front you may have to reduce the fork travel by 10-20mm to preserve the geometry. I bought a Manitou Mastodon Pro EXT to clear a 29" midfat or 27.5x4.6 front tire and wheel set up on my 2016 Salsa Bucksaw carbon (100mm fork travel). The gyroscopic forces created by the massive front wheel outweighed the monster-truck capable front end and traction benefits for me, even in steep and gnarly descents. It also made my seat tube angle even slacker so I think I'l push my fork travel up to 120mm and ditch the 27.5 wheel up front.

Good luck with the race!
flag cyclopsrevolution
O+
Posted: Dec 20, 2023 at 19:15 Quote
How did this work? Did you go Mullet on the Fat Bike?
flag Staktup
FL
Posted: Dec 21, 2023 at 11:29 Quote
I thought I explained it with the sentence:

"The gyroscopic forces created by the massive front wheel outweighed the monster-truck capable front end and traction benefits for me, even in steep and gnarly descents. It also made my seat tube angle even slacker so I think I'l push my fork travel up to 120mm and ditch the 27.5 wheel up front."

The bigger wheel was harder to control (wheel flop) and so it is not worth it for me but YMMV
flag mamitko
Posted: Mar 22, 2024 at 0:41 Quote
Having a small front wheel looks completely pointless.
A bigger wheel rolls better over the bumps and provides better traction.
The point of having small wheell at the rear is to have more room between the wheel and and your butt (for _really_ steep terrain) if you a are short legged. Some also finds it better tail-whipping, wich is definelaly true but imho does not worth the loss of traction and rolling.

Regarding the fats: i'd rided 26" fatbike and then moved to 27'5 with widest tires possible and I even found the bigger wheel (with almost the same width) even less "self-steering".
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