Serial 1 Mosh City Electric Bike £1650 @ Leisure Lakes Bikes

Gates carbon belts aren't that common because they only work with hub gears not derailleurs but they're great. No oil, no cleaning unless you bathe them in mud and a lifespan of 10k miles or more.

I rode a simalar one testing out cycle to work scheme bikes and it does kinda make sense for a city bike. It has one gear, a very hard one meaning if you didnt have a motor, you would need some muscle. But the motor makes it all easy, whilst still allowing you to reach fast speeds because of the hard gear. Only time it was an issue was when I went up a very steep bit of hill & the motor didnt support very well

That's what I'm thinking. With my bosch mid drive in turbo I find 14 gears is too many, I jump from 3rd to 7th to 9th. I'd like to know the sprocket size for gearing, if this is set so you spin out at about 20mph it's probably great. (edited)

That's good logic but in fact mid-drive motors seem to be unfairly allowed to use much more power. Bosch motors have been shown to be using around 800W when climbing hills for the more powerful models that still claim to be 250W. The certification has references to how the motor should be tested for duty cycles but this part of the legislation is completely ignored it seems to give European/German manufacturers an unfair advantage. No one with electrical knowledge believes these motors are 250W it is all a farce.

ebikeschool.com/myt…ge/

It would be so much easier to rate ebikes by their controller sustained and peak wattage which I think is how e-motorcycles are rated. A 250W ebike should have a 7A controller (7x36V) is about 250W but something like the Bosch mid-drive will draw up to 22A at 36V when climbing hills which is over 700W.

If a Bosch mid-drive was limited to 7A at 36V it's torque output would likely be less than a typical hub motor because you would lose some power with their internal gearing and in the chain and cogs of the drivetrain. So in order to give European high cost ebike motor manufacturers an advantage they seem to allow them to bypass the 250W rating.

Cyrusher is a selling a 750W ebike as 250W in the UK. They are copying the fraudulent way mid-drives are sold so you can now get a 80Nm hub motor ebike pretending to be 250W too and I guess it's near impossible to prosecute them due to the illegality of most mid-drive motors. If they start crushing Cyrushers they will have to crush all these mid-drive ebikes too.

cyrusher.co.uk/pro…ike

It's a very complex situation for the police to prosecute ebike riders as the law is a complete mess.

Good spot, the rush has a bigger battery and mudguards also. Tempted

probably because it looks pretty ugly!

To be fair the description states it's the 2021 model. What do you expect for almost 60% off RRP?

A powerful mid-drive motor like that would soon destroy hub gears like the Nexus 8. Bosch do a mid-drive motor designed for weaker hub gears and its only 40Nm output and still typical lifespan of the hub gears goes from about 20,000km to 8,000km with a lot more early failures. Those hub gears are designed for human riders but this could be 5x that altogether when climbing hills. Human maintained torque is about 20-50Nm depending on age and fitness. So 50Nm+90Nm is 140Nm which is actually 7x that of weaker humans on their own. Hub gears are best combined with a front hub motor as the hub motor takes a huge load of the hub gears when climbing hills and can massively increase their lifespan. That 20,000Km expected lifespan can go on to 60,000Km or beyond. We simply don't know because they typically aren't failing when you combine a front hub motor with rear hub gears. The best hub gears for a mid-drive are the simple 3 speed hubs, they are much more reliable and strong and surely enough anyway with a mid-drive motor.

Just don't buy it

Most products are great when you receive them but its how they perform over the years. It would be interesting to know how much you have ridden the bike 3 years from now and what problems you have faced. Some people are using their ebikes 200 miles a week (15 miles each way of their commute over 5 days plus other riding). 200x50 is 10,000 miles although many wouldn't ride in the winter so much. Others just use their ebikes as a novelty that they ride occasionally and maybe only clock up 200-300 miles before selling.

You ought to try to use it more often at the beginning just to reveal any problems. Some people have bought high end bikes, £6k approx and used them very infrequently and after only a few hundred miles but 2 years into ownership the ebike has failed out of warranty. One common issue is summer only cyclists who forget to regularly charge the battery so the battery bricks itself due to low charge and needs a replacement. That was Bosch based bikes not Brose though. The other big issue is motor failure typically after a lot of hill climbing especially if a rider is at the higher end of weight limits. I think a lot of Brose motors fail in the first few hundred miles, typically belts slipping and other issues. Some people with Specializeds have gone through 4 or more motors within the warranty period although those are likely used off-road. I would definitely want to use it a lot at the beginning and give it a few hill tests to make sure its a good example while you have a warranty. They can be uneconomic to repair out of warranty especially if you have paid £1650 for a £3000 bike. A £1000 motor replacement bill would likely be unacceptable to you.