Dropout spacing

[Jae]

The Mongoose Malus i just bought has a rear dropout spacing of 185mm,is it better to spacer the motor or spread the frame a little? I see 170 and 190mm 3000w hub motors on Aliexpress at 170 and 190mm. I would think spreading 5mm would be the most logical option.

 

[E-HP]

It will be 5mm plus a washer inside the dropout on each side, so more like 8-9mm. Tough call.

 

[Jae]

I Wasn't thinking about the washers on the inside,thinking now 170mm may be the better option

 

[E-HP]

For planning, depending on how many washers you use, expect that you may need spacer washers for your caliper or disc to maintain brake alignment.

 

[Jae]

Kinda bummed i think i messeed up.I was wanting to use the qs205 but aparently that only comes in 150mm. 35mm would be a lot to try and spread the frame i think Am i looking at this the right way? Or should i just spread the dropouts that 35mm?

 

[99t4]

Am i looking at this the right way?

Appears not. Apparently the motor is 35mm narrower than the dropout width?

Verify:
Motor OLD* = 150mm
Bike dropout spacing = 185mm
That leaves 35mm space between the axle locknuts and inner surfaces of the dropouts. Fill with washers as needed.

*OLD = Over Locknut Distance = Width of the motor essentially, measured to each of the outer surfaces where the bare axle emerges on each side.

From Bicycle Frame/Hub Spacing

 

[Jae]

Yes thak you i realize my mistake now.Not sure how i got that backwards i feel kinda dumb now haha.