Front hub direct drive suitable for fatbikes?

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ziebike   1 µW

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Front hub direct drive suitable for fatbikes?

Post by ziebike » Feb 16 2018 3:16am

Wanted to know whether there were any front hubs that would fit 135mm dropouts.
Have tried some google-ing but not having much luck.

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amberwolf   100 GW

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Re: Front hub direct drive suitable for fatbikes?

Post by amberwolf » Feb 16 2018 3:24am

Why not just use a rear hub up front?

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Johne-bike   10 W

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Re: Front hub direct drive suitable for fatbikes?

Post by Johne-bike » Feb 16 2018 3:34am

There are quite a few. Check it out on Aliexpress for instance. Mxus, Bafang, Mac and many others all make Hubmotors that will fit into 135mm dropouts. Just remember, they will work better with a non suspension front fork, and also fit some good Torque Arms.
Personally, I think you would be better advised to fit a rear Hubmotor. I believe you will find the bike's handling and balance much nicer with a rear hub, and then it will be much easier to use a front suspension fork if you choose later.

ziebike   1 µW

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Re: Front hub direct drive suitable for fatbikes?

Post by ziebike » Feb 16 2018 5:05am

This may sound really dumb, but I wanted to do a BBSHD in the middle and then a hub on the front for some 2WD action. I also plan to put this on a fully rigid bike so no worries about front suspension

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Re: Front hub direct drive suitable for fatbikes?

Post by nifty150 » Feb 16 2018 10:11am

amberwolf wrote:
Feb 16 2018 3:24am
Why not just use a rear hub up front?
Rear hubs allow space for cassettes so I don't think that would work well.

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Re: Front hub direct drive suitable for fatbikes?

Post by docw009 » Feb 16 2018 1:49pm

Sure, a 135mm rear motor w/o freewheel can be centered in a 4" rim. That was my first spoking project and it came out OK. I did a 500W geared motor, and the whole combo, tire/rim/motor, was 16.0 pounds. Your DD motor might weigh 20 pounds. That's heavy.

2WD did work nice in snow, but riding in snow is not nice in my opinion. I lost interest and plan to put that motor back into its original rim.

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Re: Front hub direct drive suitable for fatbikes?

Post by amberwolf » Feb 16 2018 3:58pm

nifty150 wrote:
Feb 16 2018 10:11am
Rear hubs allow space for cassettes so I don't think that would work well.
If you mean taht they're dished to one side, that's generally not the case with hubmotors (vs normal hubs).

Just make sure the axle shoulder to spoke flange distance is equal on both sides.

Or just lace the wheel as a dished wheel, it still works fine (just not quite as strong as otherwise).

Keep in mind that with a fatbike rim you're already likely to have to do some funky lacing tricks to make a strong wheel, if the nipple holes are spread wide across the rim rather than in a narrow line down the middle. Stuff like lacing from the left side spoke flange to the right side nipple holes, so you can get triangulation to laterally stiffen the wheel.

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