My first chapter with CB and feedback on the 50mm motor after a few rides (cut short). I'm very happy with my new road bike flat bar commuter mk2, and the CB complements my goals for a great bike with/without electrics, and no real "battery range limits" using pedal power and infrequent bursts of the CB for faster climbing.
I loved the smaller size, ran it with default brain box settings 500W with a 5Ah 6S battery in a slightly modified water bottle tool container in 2nd water bottle holder, carrying identical spare battery in my rear bag to be swapped on at work for return commute in lieu of a 2nd charger kept at work.
The motor and controller have blown after two stuck throttle button incidents. The motor came loose shortly after the 2nd stuck throttle incident, so I didn't use it enough to kill it that day. Next use first hill climb caused total motor burnout and subsequently found a dead ESC also.
I am now looking to:
- upgrade to 8Ah 6S batteries
- new controllers (no stock at Hobby King again - any tips for alternatives?)
- new spare 50mm motor
- but will first try the 63mm motor I have. I had the 63mm set up last night replacing the dead 50mm, but no-load test found the controller was dead from the motor burn out
First full test of the 50mm was about 13 climbs (mostly freeway overpass elevations) over a 20km commute trip home which is the more uphill trip (more downhill or shorter climbs into work).
I engaged it on the flat early enough to get up to speed (instead of dropping down a gear and spinning legs up without motor), then could hold higher gear and pedal assist as it flew up in anger (I do like the noise in a "coming through!" warning aspect for regular cyclists climbing ahead). It was after dark, so it felt like a rocket, insanely quick with the typical faster feeling from reduced vision in the dark (unlit cycle paths). In daylight I had time to look at my cruise 32kph, that increased over 40kph with CB engaged and wound up to speed before hitting the hill.
I liked that it is noisy, in tandem with my single 5Ah battery, it kept me honest to only use it for bursts of climb assists and not the majority of the ride.
In the wet, any hint of damp road/path and I couldn't get traction. When it was nearly dry, it was easy to see dry patch to damp patch, and if running over a non-dry patch it would slip after running over any hint of moisture. The great thing was it didn't matter, without the assist it is still a fast road bike. I've been over 2 weeks back on road bike commuting again after 4 months with the A2B Metro.
The only setup catch I had was tMin at 1100 being too high for the ESC, so Adrian advised tMin 1000 and problem solved.
Congrats to Adrian on such a good kit already with still more potential, it's made my best road bike become my best (dry weather) e-bike now. I have cycle commuted every working day this year, and even when tinkering all night with only 2hrs sleep could still get to work taking it easy on the way in, with assist for the way home (it was dry that night).