Can I fit a 150mm hub motor on a 135mm dropout?

[rg12]

Hey Dudes,

Is there a tested way to grind some of the chassis or the motor axle in order to fit a 150mm hub on a 135mm dropout?
If so, will the disc brake work?

 

[Chalo]

Short answer: No.

Longer answer: if you are using a non-suspended steel frame with unfashionably long chainstays, it might be possible. The fact that you're considering an overly wide hub motor suggests that a sensible, comfortable, robust, fashion-proof, proven bicycle is probably not your jam.

 

[dogman dan]

To do it, you have to bend the frame out to 150mm. This is not a good idea, if even possible if the frame is not steel.

Bend a steel frame out far enough, then the frame angles change, and the disk may be crooked till you re bend the frame at the point the dropouts meet the stays.

So no,,, it's not going to be a simple process to make the brakes work right.

Flex a frame out 5 mm no problem. but 15mm is a lot of bend out. Doable with steel, not advised with alloy.

 

[rg12]

Thanks guys, idea dropped!

 

[dogman dan]

For others that might be reading,, you can cram a 150mm motor into 135, by using a single speed freewheel, and a lot of dish on the wheel. the other side unchanged, the disc sill lines up same.

I misunderstood the original question. The motor itself might have to have a new axle shoulder machined onto it, or maybe just a spacer shortened. The threads likely will stop too short, so a big stack of washers or thick torque arm will be needed on the outside of the dropout, so you can still get the nut to put pressure on the dropout.

I was thinking, cram 150 into 135mm,, and still have 7 gears. Sorry about the brain fart. I'm old and dumber now.

 

[rg12]

For others that might be reading,, you can cram a 150mm motor into 135, by using a single speed freewheel, and a lot of dish on the wheel. the other side unchanged, the disc sill lines up same.

I misunderstood the original question. The motor itself might have to have a new axle shoulder machined onto it, or maybe just a spacer shortened. The threads likely will stop too short, so a big stack of washers or thick torque arm will be needed on the outside of the dropout, so you can still get the nut to put pressure on the dropout.

I was thinking, cram 150 into 135mm,, and still have 7 gears. Sorry about the brain fart. I'm old and dumber now.

What do you mean alot of dish on the wheel?
The axle of the motor is much bigger than the dropout slot where the axle meets the frame.
The thinner flat parts of the hub's axle (with the threads) is outside of the frame and the middle part is like an inch thick on one side, so it mean that I need to butcher alot of frame material, and that's also where the cable comes out of so it a problem...I can try to move the motor to the right but then it wouldn't be centered in the frame.