Hub motors with 10mm axles

[Manbeer]

Looking to compile a list of hubs that have 10mm axles and can properly recess into most dropouts without filing. from what i gather from Justins extensive research and documentation, it seems the bafang g310 and the GMAC will properly fit into most bikes without filing. For those of us wanting to convert vintage or collectable frames and make the installation as reversible as possible, this is a big benefit

Does anyone else have any others to share?

 

[e-beach]

It is the frames that have 9.5mm dropouts that you need to be aware of. As for the Yescomusa motors I run, they have 10mm axles.

 

[Manbeer]

It is the frames that have 9.5mm dropouts that you need to be aware of. As for the Yescomusa motors I run, they have 10mm axles.

you know, thats what confused me. as someone who wrenches on bikes for a living, we always called them 9x100 or 9x135. I always took is as that the dropouts were slightly larger so wheels could be easily installed and removed And 10 mm was probably normal, but i hadn't thought of that
Are the yescom you are referring to the DD or geared hubs? EDIT: Just saw your rides in signature

 

[e-beach]

....
Are the yescom you are referring to the DD or geared hubs? ..

Yes my motors are indeed 10mm. The kits are inexpensive and durable.

I have attempted to file down the motor axles, but that steel is really hard. So, I have had to file my dropouts open, both front and back. This one of the reasons clamping torque arms are valuable. When we file, we all endeavor to make them perfect, but we are human. So if the dropout filing doesn't go perfectly, clamping torque arms are a good second measure.

I don't know why DD motors are made not to fit in most bike frames. But it also highlights the value of Justin's research on what motors fit more easily.

 

[MadRhino]

Almost every hub motor on the market are standard 10mm axle flats. Only very few big DD with a bigger axle have larger axle flats. Yet, filing the dropouts to fit a motor axle is not unusual, for frames typically have dropouts that are a tad narrower.

 

[Chalo]

Does anyone else have any others to share?

Heinzmann hub motors have round 10mm axle ends and torque arms.

 

[Manbeer]

The heinzmann catches my eye as i have a thing for german stuff, though im probably in for a bit of sticker shock

 

[amberwolf]

Looking to compile a list of hubs that have 10mm axles and can properly recess into most dropouts without filing. from what i gather from Justins extensive research and documentation, it seems the bafang g310 and the GMAC will properly fit into most bikes without filing.

Pretty much any hubmotor intended for bicycles has a 10mm axle, as far as the *flats* go, so they all fit in common 10mm bicycle dropouts. Larger stuff intended for scooters and motorcycles and the like may use wider spacing between the flats, or even ones that arent' parallel between axle ends, or something else entirely.

But none of them have 10mm *diameter* axles, becuase if they did, there would be nowhere for the flats to be, as it would be entirely round. So they will all be "taller" than the axle the dropouts were intended to fit--whether that means a problem requiring filing depends on several things--the first being whether the dropout is deep enough to accomodate the extra mm or two, and the second being whether the end of the dropout is rounded to a 10mm axle's circumference, or if it is a generic curve, etc.

The smaller / older motors used 12mm diameter axles, which would be 1mm "taller" than the 10mm dropout was designed to hold. Sometimes that's not a problem, sometimes it is.

Newer / larger motors use 14mm diameter axles, whcih is 2mm "taller", and is more likely to be a problem.


For motors that don't use axle flats to transmit torque, but instead use an integrated torque arm (Heinzmann, potentially the Grin All-axle motor, perhaps other customized motors from Grin), they probably have 10mm *diameter* round axles to better fit traditional bike dropouts. (or in the case of the AAM, such an axle can be created and installed).

Even newer motors (from Grin at least) use thru-axle type axle mounts with integrated torque arms.

There's also ones like the TDCM w/IGH that Grin sells that I think also use an integrated torque arm but *also* use axle flats. But I couldn't find an axle size listed on their info page for that motor.

One thing the Grin site could use is the ability to sort motors by axle OLD / length, as well as by axle diameter.

 

[Chalo]

GMAC has a round 10mm axle and a torque arm.

 

[Manbeer]

Good point, i suppose the integrated torque arm would be the giveaway as you're right...if it was a 10mm axle, it would have to be round or the flat would have to be even less