Trek 3700 conversion

bww129

100 mW
Joined
Apr 14, 2020
Messages
41
Location
Lancaster PA, USA
There's nothing special about this conversion; just wanted to give this "hobby" a try and see how the old bike would handle it. The Crystalyte H3525 in a 26 inch rim, C7240-GR controller, CA V3, half twist throttle, and V4 torque arms are from Grin Tech. The Wolf V2 pack is obviously from Luna Cycle. The bike's all up weight is now 61 lbs. Add a 200 lb rider and this combination of components can reach 28-30 mph on a flat road with no wind. The current draw maxes out around 40A with judicious use of the throttle, but it gets up and goes better than I had expected.

The only thing I'd like to add is regenerative braking, but the trigger shifters do not allow the use of the typical brake levers with integrated switches. Does anyone have any suggestions on the best way to add a switch to a trigger shifter? I was thinking of drilling a small hole in the brake lever, dropping in a neodymium magnet, and attaching a hall effect sensor underneath the lever since the CA V3 could work with a hall effect sensor. While that would be reasonably clean looking, there might be a better solution I haven't been able to find.

With the addition of regenerative braking, I've read many posts that warn about the axle nuts eventually working loose. I had hoped to mitigate this by using one TA on the top and one TA on the bottom, but the rear dropouts and frame only allow the Grin V4 torque arms to be positioned on the underside of the frame on both sides. Will this be an issue with regen or should I not be so worried about it?
 

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