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They are probably the in-house brand of a factory that either produces bikes or e-bike systems for other brands. They likely show at Eurobike or Taipei bikes show and sell / market directly to bike share schemes or bang them straight on Aliexpress. I'm sure similar bikes will appear at consumer electronics shows and sell to shopping channels as well.
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Zoomo has a shop by us in Streatham and another in fulham I go past on the way to work.
They rent to delivery folk but also have options for the regular commuter. If you were only going to use an ebike for a few months in the summer, or just want to get an idea of what they are like before splashing out on buying one I think that's a pretty sensible option. All maintenance included in the hire term. -
Those two varients of whatever falls off Aliexpress aren't too bad. At least they aren't total death traps.
Most of the rest of the fat tyre ebikes the deliveroo guys get now ARE deathtraps. Recent failures noted in person (LOTS of them)....
Disc brake rotors worn down to a knife edge in as little as 400 km (1 week)
Disc brake pistons making a break for it due to wrong size caliper adapters installed so only 20-50% of pad is touching rotor
Fork failure, lots at the crown and internally
Steerer failure above the headset
And then all the usual, bad hubs, bad tyres, bad BB, headsets etc all disintegrating within a few weeks/months of use leaving uber/deliveroo rider stranded with no income and a big bill from any bike shop that would take on the work, but most including us now (had way way too many of these guys have full blown man tantrums when we tell them it'll take 8-10 weeks to get a replacement fork from china for them, when most shops turn them away at the door, so we now also turn them away at the door).
And then the usual battery failures, not fires, just failing to take a charge or work.
Bafang and tongsheng? Main eBikes I see round here are conversion jobs. Other factor is probably E-scooters which outnumber ebikes by comfortably 4 to 1 round this way. Guess when vanmoof started they were less of a factor.