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yes. The battery is standard 40 cell bottle. It's easy to change for 11.6AH 40 cell bottle, you can also fit 50 cell bottle (15AH) with the right mounting kit.

the Sundowner has Nexus 7-speed hub gear, fast rolling 700C narrow tyres and King Meter J-LCD. You can pedal quite fast with it. http://wooshbikes.co.uk/?sundowner

I tested my BBS01 at 48V instead of the normal 36V, I can tell you that the kit works but feels definitely iffy. The motor heats up more quickly, increased gear noise, speed gain is about 15% instead of predicted 33%. I did the same with the Woosh Big Bear, similar result. I gave up on the idea...

his bike is practically new, only 50 miles on the clock, d8veh. Overvolting the bike is going to be expensive: new battery costs at least £250 shipped from the UK to Ireland, he'll lose even more if it does not do what he wants. (he wants a 25 mph bike)

the 450W is from the load plot. That's the power required to push 150kgs (125kgs rider + 25kgs bike) up 10% gradient at 10mph for a bike shape object.

I don't care what you think of Woosh - if I have to make a comment, you are rather obsessed by them. There ought to be a rule here 'Thou shall not say ill of thou neighbours'. How often other traders comment about your bikes?

No, that's not what the line means. Firstly, I did not mention Woosh in the thread up to then. Secondly, if the cyclist inputs 10W, Bosch bikes would give 25W in assist while Chinese bikes can give a lot more assist than the Bosch bikes 'like nine times' 10W, like 90W. You omitted the word...

if you can't remember the exact words then use copy and paste. Why oh why do you have to misquote me again? 'Trex dismisses every bike other than Woosh,that is so disrespectful to some beautiful bikes' Where did I make such a statement? 'Trex claims that the Woosh with a throttle is so much...

I think you would be better off checking with Woosh if they can sell you a a Sirocco CD rear wheel. It's a drop in replacement for your rear wheel, but you can select a 7-speed cassette to suit, like this one...

denwyn has 3 in a year - so if this one lasts until the Spring then we've got a winner!

The point I tried to make in reply to the OP's question is that if you are unfit and live in a hilly area, Chinese bikes are a better choice because you don't have to pedal hard to go uphill, power delivery is dead easy with Chinese bikes. That's with the benefit of hindsight. Edit: provided...

point taken, to both of you. While it's easy to explain the proportionality of the Bosch assist ratios, how do you compare with Chinese bikes where these ratios don't exist? I wrote in my first reply 'Chinese bikes tend to have much higher assist, like 900%. If you're a bit unfit, get a bike...

I think Woosh use 7-speed screw on TZ21 freewheels on their bikes. http://www.halfords.com/cycling/cycling-parts/cassettes-freewheels/shimano-mf-tz21-7-speed-bike-freewheel-14-28-t

That's my own estimate. Most Chinese bikes do not have torque sensor, the amount of motor power you get depends on the assist level you set, the speed you are travelling at (faster = slightly less power) and the rotational speed of the cranks (faster = slightly more power). The throttle is much...

that's correct. The estimated assist ratios are based on my personal experience with the Woosh range of Chinese bikes.

the 900% assist ratio that I gave earlier is to keep to the Bosch way of specifying assist ratio. That means the motor will give 900% of the cyclist input. When you read the European bikes' brochure, you see specified 'Turbo: 250%' that means the motor output is 250% * the cyclist input...

No. With European made bikes, the harder you pedal, the faster you climb. There is a fixed ratio between the motor support and your own input. On Chinese bikes, it's more complicated but requires much less if no cyclist input. You need to use the e-bike emulator at ebike.ca to work out case by...

I can see the confusion now. The 'new bikes' should have been written as 'new models'. apologies to you both.

dave, the assist ratios given by Bosch is the multiplication factor. Motor output = assist ratio * cyclist input If the ratio is 900%, the motor will supply 90%, the cyclist supplies 10%. If the ratio is 250%, the motor will supply (250 * 100 /(250+100) % =) 71.42% the cyclist 28.58% 28.58% OK...

I am very pleased for you denwyn. It's a very good bike, light and fast, quite like mine in many ways, and you've got it at a very good price. Do let us know how you get on.