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I am indebted to you for your support.

When you've sold 500,000 ebikes, none of the 499,997 who are delighted with their ebike go on forums to comment. The 3 who had a problem do. Same with cars, with mobile phones, with every other consumer good.

And many tens of thousands of people utterly delighted with the brilliant quality of Kalkhoff ebikes.

Kalkhoff Sahel Compact "Urban Impulse" electric bike. Literally mint, showroom condition, fitted with the extra cost Kalkhoff ultra long range (90 mile) 603 Watt battery, the bike has done just 39 miles. Every component is of the very highest German engineering quality: Impulse crank drive with...

Any news on that possible ex demo please David?

Hi David - thanks for that. Yes I'd be very happy to consider that option alongside the others that we are kicking around. The bike is for my wife. As it happens I already have a Wisper 806 Torque with 575watt battery. Would you prefer to email me with all the details on your ex demo bike...

If anyone is looking to sell a secondhand top brand 20 inch wheel folding ebike, with a long range battery, in the coming weeks, do please let me know. Just one example of the sort of thing we are after: Wisper 806se or 806 Torque, with the 575wh or 700wh battery. Cash waiting. Thank you.

Many thanks, that's a great offer and I really appreciate it, but I think that's really too far away from us. Google maps reckons 3.5 hours ish each way just for the driving, getting on for a 400 mile round trip. But just as a matter of interest, have you got any feel for a rough all-in...

Many thanks, so it is possible, which is great news. But as mentioned in my original post, I have no expertise in this area. I have no idea what I would need to order, or how to then assemble with the wheel, battery, controller etc.. That's why what I'm trying to locate is a company or skilled...

I have just gone and measured... yes, they are the narrow forks, dropout width is the 74mm that you mentioned. Could you recommend any specific options, based on slab battery in case bolted on top of existing rear rack? Is there a really simple power controller..perhaps just a 3 or 4 position...

As they both have the standard Dahon rear rack, I was thinking that maybe some conversion suppliers might offer a horizontal "slab battery" style battery, that would sit on top of the existing rack, possibly in a sort of cage thus providing another rack above its housing. Then a simple front...

Oops, sorry, my mistake! Have just been over to the car where they are sitting in the boot folded up. They are both Dahon VITESSE model 20minch wheel folders.

Yes, that is the other option we are considering, particularly given the rate of reduction in new ebike prices year on year, and advances in technology. It's just that we were thinking that if we could get brand new conversions including decent range batteries for (say) around 500 quid each...

We have a pair of Dahon "Vitesse" 20 inch wheel folding bikes, which we definitely want to have converted to electric assistance power. Doesn't need to be a Rolls Royce conversion, but does need to be powerful (36 volt 250nm?) and does need to have substantial battery range, so perhaps 12 amp...

Many thanks for your advice. The front wheels are I think the narrow ones... I've just looked and with the wheel clamped in place the distance between the inner faces of the fork where the wheel axle passes through is about 75mm, so they are I guess the "83mm dropout" width (?) I'd be very...

Both my wife and I have "normal" Dahon Vitesse 20 inch wheel folding bicycles which we use extensively when touring with our caravan around the UK and abroad. But the years are catching up with us... and we are looking for propulsion help! I'm trying to track down a supplier/installer in the...