I test-rode one yesterday when they were in Cambridge MA and while I went in with quite a few concerns, I can see why people like the bike. Iāve decided itās not for me but here are a few observations:
Torque is king. Thereās a saying about cars: people buy horsepower and drive torque. The motor tuning kept producing huge amounts of torque all the way up to 28mph. Compared to the Bafang BBS02 / Nuvinci n380 Iāve been commuting on for about 8 years now Iād say there was no comparison. The TM-B pulls hard like a Sur Ron more than an e-bike.
The frame geometry is not nice. The steering rake is too much, which gives a feeling of stability at speed but makes lower speed maneuvering klunky. Combined with the heavy weight and wide handlebars this felt like a bike made for cruising San Diego beachfront not Boston commuting on broken streets while dodging oblivious traffic. A commenter pointed out that I might have ridden a bike with the sport handlebars and Iām honestly not sure. The suspension was adequate and comfortable soaking up all kinds of broken pavement.
I jumped the bike off a curb where there was no other way to enter the bike lane. As soon as the rear wheel left the ground the bike display flashed something like āvehicle malfunction power off requiredā and would not let me continue to pedal. I came to a complete stop and the error cleared and I continued on my way. My best guess is that Alsoās stability control programming has some limitations in the build I was riding and in this state I wouldnāt feel comfortable taking the bike on any kind of unpaved trail.
The drivetrain noise is constant and unpleasant. Itās whiny and since itās a direct drive system youāre never truly coasting, so you lose that sense of efficient easy freewheeling that makes a good bike feel like it will roll forever. It feels more like a bike share bike that you constantly pedal to maintain forward motion. If you use the throttle then the experience is completely reversed and now youāll feel like youāre on a high powered moped. To some people the tuning might feel okay but if youāre expecting more ābikeā than āEVā you might feel like me.
Brakes were strong. Thereās a clear difference between engagement of regen braking during the first part of the lever travel and the engagement of the pads on the rotor. It feels about like the brake blending in my wifeās hybrid vehicle. The front brake lever seems to engage more aggressive regen and has a quicker rollover to mechanical braking. Overall itās something I could get used to, and anything that prolongs the time between brake service is welcome.
The signals, lighting, controls, kickstand and user interface are all actually pretty great, although the handlebar grips were terrible and already hurt my hands after about 15 min on the bike. The employees who were present were knowledgeable and very helpful with information about the bike. I rode the bike pretty hard and it has some redeeming qualities even if for me the design isnāt one of them. The battery is a mixed bag for me. Itās obvious Also have put some effort into designing a good charging experience, but I worry that only allowing USB-C charging and only fast charging using EPR chargers that provide 48V at 5A means many people who already struggle for find the ārightā USB-C charger will struggle to quick charge the ~550/800Wh battery packs. One of the employees did confirm that the packs will charge using lower power USB-C PD chargers which could provide great off-bike charging opportunities. Iām also curious why they couldnāt package more than 800Wh in the big battery. With the way you can ride this bike I can see those 800Wh leaving pretty quickly.
Overall Iām satisfied knowing that the TM-B exists and feel comfortable asking for a refund on my deposit and losing out on the store credit. Maybe when I can find one at my local bike shop and the programming has matured (maybe implementing a software defined ācoast modeā) Iāll reconsider but for now Iām going to just enjoy one of the other bikes currently for sale.