Looking for 24” front wheel geared hub

[azisme]

I currently own a Benno Boost E 10D pedal assist bike that I want to add a front motor to.

I don’t need much power as I already have the pedal assist, 250 watts would be best. I require it to have a top speed of 20mph to conform with Arizona law. I want it mounted to a 24” front rim. The tires will be 24x2.6. Don’t think there is anything out there rated for such a wide tire but I am confident the tires will fit on a much smaller rim. The only features I prefer to use is a throttle and possibly a display.

 

[E-HP]

Since your existing rims are 36H, you have the option of buying a motor and lacing it to you're existing rim to keep them matching. Assuming you're adding a controller for the motor too, you can get one that allows you to limit the speed to your legal limit.

 

[LewTwo]

https://electricbikereview.com/benno/boost-e-10d/

According to the specs the existing Bosh motor is rated at 350 watts (570 peak) with 63 Newton meters of torque.
How do you plan to sync a new front motor with the proprietary Bosh class 2 system ?

 

[azisme]

Not sure what 36H is but I have no desire to lace a motor to a rim. I also want to keep my existing front wheel as is. Not sure why, but I do.

 

[E-HP]

G310 might work.

https://ebikes.ca/tools/simulator.html?motor=MG310_STD&batt=B3614_PF&cont=cust_15_30_0.03_V&hp=0&axis=mph&frame=mountain&autothrot=false&throt=100&grade=0&wheel=24i&mass=110

 

[azisme]

https://electricbikereview.com/benno/boost-e-10d/

According to the specs the existing Bosh motor is rated at 350 watts (570 peak) with 63 Newton meters of torque.
How do you plan to sync a new front motor with the proprietary Bosh class 2 system ?

I don't plan on syncing or linking the two motors in any way. I want my mid drive pedal assist to work as is and ad a new motor to the front wheel with a throttle.

 

[azisme]

G310 might work.

https://ebikes.ca/tools/simulator.html?motor=MG310_STD&batt=B3614_PF&cont=cust_15_30_0.03_V&hp=0&axis=mph&frame=mountain&autothrot=false&throt=100&grade=0&wheel=24i&mass=110

I briefly looked at Grin website yesterday, but I had no idea of all the products a services they provide, especially motor lacing. The only info I can't find is the speed limiter. Is it the controller that regulates speed? I plan on pushing the limits of AZ law so I want to make sure it has a 20mph limiter. I got pulled over on a trail several years ago on a different bike.

 

[Chalo]

First, find a hub you want, that runs at the speed you want. Then lace it, or pay someone to lace it, to a good wide rim. Assuming your 2.6" tires measure 25" in diameter fully inflated, you need 270 RPM to go 20 mph. You can either use a faster motor and restrict it to 20 by programming the controller accordingly, or you can get a motor with an unloaded speed of about 325 RPM at the voltage you plan to use (and it will run out of legs by approximately 20mph).

If you can find a 24" BMX rim that features across-the-rim lacing, you can squeeze in some extra side bracing angle that will make your wheel stronger.

Do understand that the wheels that come laced to Chinese hub motors are super garbage and will tax your patience. DIY is better, locally built by a mechanic is better. If you absolutely must buy a ready-made wheel, get it from Grin Tech. That way it will be made from decent components by a competent wheel builder.

 

[azisme]

G310 might work.

https://ebikes.ca/tools/simulator.html?motor=MG310_STD&batt=B3614_PF&cont=cust_15_30_0.03_V&hp=0&axis=mph&frame=mountain&autothrot=false&throt=100&grade=0&wheel=24i&mass=110

Thanks for the link. I am confident they have just what I am looking for, just need to mill around for a while. I already found out that a Cycle Analyst will control the speed.

 

[E-HP]

Thanks for the link. I am confident they have just what I am looking for, just need to mill around for a while. I already found out that a Cycle Analyst will control the speed.

I can see using that setup for adding some extra boost starting out at an intersection, or when going up a hill. Since it's geared, it will coast when you're not giving it throttle. It will be interesting to see how it works combined with a torque sensing PAS. Might not matter in those situations.