Santa'sLittleHelper
100 W
Hello all. Pretty new to E-bikes here, but have played around with a BaFang 350W/37V mid-drive equipped hardtail eMTB for the last six months. I now ride a full suspension (FS) carbon MTB with the typical curved down tube near the bottom bracket (BB), that has a small triangle space below the rear shock that sits horizontal below the top tube. The only thing I miss about the eMTB is the climbing assistance it provided. Otherwise I like the feel of the FS MTB as is.
An ideal electric assist setup for me would be something like a geared front hub motor that free wheels, mounted in the small triangle space below the rear shock and above the BB, that is activated by a torque/cadence sensor and/or on-off boost push button throttle when climbing.
Limiting factors for my idea require the 100mm front fork motor selected to be only 5” maximum total diameter (or can have the spoke mounting lip cut off on a lathe to meet that diameter) with the wiring coming out of the motor itself, not the axle (so the axle can be cut down for a thin nut, keeping the overall width to a minimum) and has a disc brake mount. Power output must be California legal, so 350W-750W/37v-48V minimum-maximum. My initial thought for power to the crank is to mount a sprocket to the disc brake mount that goes to a right square crank arm mounted on the left side of the BB with a sprocket. This will also allow further geared reduction as needed.
Has anyone installed a geared front hub motor that freewheels within a bikes frame triangle? If so, please provide a link (I could not find such an application using the search engine).
Are there any geared front hub motors that meet the requirements stated? (Power, diameter, wiring, disc, etc...)
Do you see any problems with this approach? (I can't be the first one to think of this, so why don't I see them out there?)
Any chance there are rear hub single speed motors out there that are “narrow” like the typical 100mm front fork mount motor? (That would make the motor to crank chain setup easier)
Thank you for your thoughts and experience.
An ideal electric assist setup for me would be something like a geared front hub motor that free wheels, mounted in the small triangle space below the rear shock and above the BB, that is activated by a torque/cadence sensor and/or on-off boost push button throttle when climbing.
Limiting factors for my idea require the 100mm front fork motor selected to be only 5” maximum total diameter (or can have the spoke mounting lip cut off on a lathe to meet that diameter) with the wiring coming out of the motor itself, not the axle (so the axle can be cut down for a thin nut, keeping the overall width to a minimum) and has a disc brake mount. Power output must be California legal, so 350W-750W/37v-48V minimum-maximum. My initial thought for power to the crank is to mount a sprocket to the disc brake mount that goes to a right square crank arm mounted on the left side of the BB with a sprocket. This will also allow further geared reduction as needed.
Has anyone installed a geared front hub motor that freewheels within a bikes frame triangle? If so, please provide a link (I could not find such an application using the search engine).
Are there any geared front hub motors that meet the requirements stated? (Power, diameter, wiring, disc, etc...)
Do you see any problems with this approach? (I can't be the first one to think of this, so why don't I see them out there?)
Any chance there are rear hub single speed motors out there that are “narrow” like the typical 100mm front fork mount motor? (That would make the motor to crank chain setup easier)
Thank you for your thoughts and experience.