strongest torque hub for Fox 40 forks

[john61ct]

using Fox 40 forks as an example only because they get raves

feel free to suggest others that may withstand a hub motor's torquing even better

ideally made of steel.

Main question - what is the torquey-est hub motor you would pair with it? If we're talking geared maybe GMAC as a minimum starting point.

Use case is tandem / cargo, long tail, carrying hundreds of pounds,

longitudinal CoG forward as possible, heavy rider and big batteries foremost of all so front weighted even without the cargo - so assume front wheel doesn't spin going up hill, unless ice on the road

Regen / drag braking handled at the rear, panic-stop front brakes are mechanical only, not electronic.

Semi-fat maybe 3"

mostly rough roads and gravel / dirt tracks, yes sometimes off road but no "fun", pure utility A-B transport of supplies at slow speeds.

And yes, front hubs can kill you, we know.

 

[neptronix]

A grin all axle hub is the largest i'd run. It would also fit whatever axle interface such a fork has.

 

[Chalo]

A front hub in a suspension fork doesn't have to break the fork to constitute a problem. All that torque you seek will cause the fork to lock out, or at least dramatically increase stiction, whenever you're using it. And it will rapidly accelerate bushing wear and slop.

I use high torque front hubs on both my e-bikes. I think putting one in a telescopic fork is a foolish move.

The kind of bike you describe rides really nicely without mechanical suspension, due to the rider's placement in the middle of a long wheelbase.

 

[neptronix]

Ya, i would bet that even if you had a mondo strong fork, the twisting forces would constantly be beating up the bushings and other sensitive bits. On top of the funky effects on the front wheel, ie some torque steer, less traction on that wheel vs the rear, and the heaviness of the hub.

Just not worth it unless you have no other options and a very special bike.

 

[2old]

Also, doubt you'll locate a Fox, Rock Shox or other premium fork with steel lowers (I've seen only aluminum and magnesium), so the forces will challenge the dropouts. ebikesca's GMAC seems to resolve these problems.

 

[neptronix]

Also, doubt you'll locate a Fox, Rock Shox or other premium fork with steel lowers (I've seen only aluminum and magnesium), so the forces will challenge the dropouts. ebikesca's GMAC seems to resolve these problems.

The GMAC puts all the torque force on one side of the fork instead of the dropout.. the all axle motor does this too.
It can also output more low end torque than the all axle motor if programmed to do so.

I don't think there is a free lunch.. the GMAC/All Axle puts the torque in a more solid location on the fork and probably spreads the force out better too.. but for high power endeavors.. i dunno how solid it is.