Figured I'd post up some pics since I had trouble finding much about terratrike conversions, especially hub motors. Selected the ezee from Grin (great service and support!) because the main goal here is hill climbing assist and it's geared and has a reasonable weight and output. Also the sportster is an aluminum frame and the hub motor out on the boom would probably be fine but my wife wants to minimize the impact to the trike and potential hard shifts etc didn't seem like the best solution. It turned out to be perfect for this application, at about eight pounds we can remove the battery and use human power only without too much weight penalty. Picked up an em3ev battery which also is working out great, I was tempted to go the diy route but I have way too many open projects right now so I'm happy and the em3ev pack is well built and makes me less nervous about hazards etc.
The trike is still getting final tweaks and I have it adjusted for me so the blue tape is to mark my wife's boom setting and the old location of the front derailer which we are probably going to just ditch. Right now the front is a 50/34 compact setup and I am thinking about going single 42 tooth. Also the prodecotech sensor may get swapped for a Sempu that I am waiting for a replacement for, but so far this setup is working really well. Got lucky and a fairly local ebike shop had the Beam TS that they weren't planning to use due to safety (he cited the fact that pedal pressure would activate the motor, valid point but the cadence sensor/CA combo solves the concern). The Beam is prone to pulsing assist due to immediate feedback from pedal strokes but the CA averages it using the cadence input so that whole issue is completely solved by this arrangement.
There was no good way to mount the torque arm in the correct orientation so I did a little bending and welding
Made a tray for the battery so it can be removed easily, there is a bungee and a bent washer that slips into a slot on one side. The rack is the TT low rider, could have attached the tray without it but sooner or later we will want a bigger bag or something that can hang off the side of the rack. Pricey but nice rack.
The beam ts/prodecotech sensor, the stock bracket works fine as long as you don't want to shift, derailer is 86'd.
The other side, cables from the Grin 24 pole cadence sensor and the Beam bundled and shrink wrapped
The cadence sensor, this is a nice unit, very slim and mounts easily.
The wiring on the CA is pretty unsightly especially in the trike application, particularly the throttle/aux/everything pigtail. I removed it by taking the CA apart and wired the ebrake and d.aux directly in and soldered to the CA board. Had to add a throttle input which required drilling another hole very carefully, to lead out the throttle cable. All in all highly successful as the wiring is much cleaner now.
Previously I made this accessory arm for the trike from some handlebar end extensions, added a tab to mount the CA so it would be as clean as possible, and angled to the rider. Needs some paint and a better welder
Still have some cleaning up to do. Tonight I removed the front derailer and shift levers completely and added some split loom for the sensor wire and just buttoned up and cleaned up in general. Thinking about a 42 tooth front chainring as a good in between to the 34/50 setup. Pretty excited to get on a trail when we get some free time.
The trike is still getting final tweaks and I have it adjusted for me so the blue tape is to mark my wife's boom setting and the old location of the front derailer which we are probably going to just ditch. Right now the front is a 50/34 compact setup and I am thinking about going single 42 tooth. Also the prodecotech sensor may get swapped for a Sempu that I am waiting for a replacement for, but so far this setup is working really well. Got lucky and a fairly local ebike shop had the Beam TS that they weren't planning to use due to safety (he cited the fact that pedal pressure would activate the motor, valid point but the cadence sensor/CA combo solves the concern). The Beam is prone to pulsing assist due to immediate feedback from pedal strokes but the CA averages it using the cadence input so that whole issue is completely solved by this arrangement.
There was no good way to mount the torque arm in the correct orientation so I did a little bending and welding
Made a tray for the battery so it can be removed easily, there is a bungee and a bent washer that slips into a slot on one side. The rack is the TT low rider, could have attached the tray without it but sooner or later we will want a bigger bag or something that can hang off the side of the rack. Pricey but nice rack.
The beam ts/prodecotech sensor, the stock bracket works fine as long as you don't want to shift, derailer is 86'd.
The other side, cables from the Grin 24 pole cadence sensor and the Beam bundled and shrink wrapped
The cadence sensor, this is a nice unit, very slim and mounts easily.
The wiring on the CA is pretty unsightly especially in the trike application, particularly the throttle/aux/everything pigtail. I removed it by taking the CA apart and wired the ebrake and d.aux directly in and soldered to the CA board. Had to add a throttle input which required drilling another hole very carefully, to lead out the throttle cable. All in all highly successful as the wiring is much cleaner now.
Previously I made this accessory arm for the trike from some handlebar end extensions, added a tab to mount the CA so it would be as clean as possible, and angled to the rider. Needs some paint and a better welder
Still have some cleaning up to do. Tonight I removed the front derailer and shift levers completely and added some split loom for the sensor wire and just buttoned up and cleaned up in general. Thinking about a 42 tooth front chainring as a good in between to the 34/50 setup. Pretty excited to get on a trail when we get some free time.
