Yose Power Rear Hub...Torque Arm Needed or Not?

[Sheffield_Tiger]

I'm aware the Yose Power rear hub kit is a basic affair with a low end controller, and its a bit unmodulated, but im happy enough with it as a cheap conversion. Hopefully I'll use it less and less and move back to a normal bike more but that's by the by.

Im just wondering if i should be adding a torque arm? And if so, any recommendations?

I put on a couple of stones during COVID (and there's only so long that excuse lasts!) and if im using a bike, I use it, load up the panniers etc, so ive been technically a bit naughty and plumped for the 350W kit, to give me that extra push uphill with the extra weight and load without going mad speed-wise. I figure uphill, 350 is doing for me and my load, what a 250 does for a featherweight rider...

But as the motor is generating more torque, is it likely to chew up my rear dropouts without a torque arm?

 

[raleighnut]

I'm aware the Yose Power rear hub kit is a basic affair with a low end controller, and its a bit unmodulated, but im happy enough with it as a cheap conversion. Hopefully I'll use it less and less and move back to a normal bike more but that's by the by.

Im just wondering if i should be adding a torque arm? And if so, any recommendations?

I put on a couple of stones during COVID (and there's only so long that excuse lasts!) and if im using a bike, I use it, load up the panniers etc, so ive been technically a bit naughty and plumped for the 350W kit, to give me that extra push uphill with the extra weight and load without going mad speed-wise. I figure uphill, 350 is doing for me and my load, what a 250 does for a featherweight rider...

But as the motor is generating more torque, is it likely to chew up my rear dropouts without a torque arm?

What frame material ?

 

[Sheffield_Tiger]

Aluminium though hefty enough (a 17 year old Giant CRS 3)

 

[Dadam]

What's the torque? It's peak torque not max continuous power that would rip the axle out of the dropouts. Also how deep in the dropouts does it fit? I put a torque arm on my 250w Woosh kit as the axle was quite shallow in the dropouts (2019 Giant hybrid).

On balance for the 10-15 quid they cost I'd fit one.

 

[Jameshow]

If your not precious, and you have a solid axle with enough thread you could put some large washers possibly roughened up to grip the drop outs?

 

[bonzobanana]

It can be a pain dealing with punctures and many commercially sold ebikes have motor hubs that fit into aluminium dropouts. It's difficult without seeing the dropouts. 350W is not hugely powerful, that is in theory less than 10A (36x10=360W). 350W is still a low power kit. My instincts says you probably don't need one but again it has to be well seated in the dropouts and you may want to try it beforehand before choosing whether to get a torque arm. Direct drive hub motors are notorious for destroying aluminium dropouts but those are often run at un-restricted speed and if they have re-gen they will try to go back and forth in the dropouts causing problems. Sometimes an easy steel metal plate can be used and secured on one of the rack/mudguard threads like below. It's still an effective torque arm but easier to remove with a puncture especially if something with a nut head is used which you have on your multitool.