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Yes its my local Cambridge store I saw them. I think these are display models they have had the last 12 months. I told them I would mention they have a UCR60 mountain bike on this sale too. A steal at £375 I think given it also has a high spec i.e. SHIMANO full Nexus 8 rear hub as well. They...

Seems Halfords are selling 2012 models off cheaply. I just put a deposit down on one for my daughter to try. She has M.E and I built her an ebike a few years ago which she uses daily, but its in need of replacing now. This one is going for £375 with a 12 month warranty ? These listed at £1499...

Here is one of my Keyde motors build into a 16" rim. Jerry

I have looked at those bikes. Certainly seem a nice alternative to a Brompton. The motor would go in those forks fairly easily I suspect with very little stretching, probably just by hand to slot the motor in. Could you measure the width of the dropouts please ? I doubt a Brompton fork set...

Excellent points Dave. These little motors are really optimised for light assist up to 15mph. If you want faster AND more power buy a bigger motor :) 6A up a hill would not give you a lot of assistance. At 8A they do ok but then you have to run them at 36V. As with all things ebikes its a...

Interestingly I have just been learning how to work this out. This is my method which I think is correct. At 48V it will turn a Brompton 1340mm circumference wheel (this is fitted with a stock Brompton Kevlar tyre) at over 17mph. In practice a 48V battery will be just over 57V hot off a...

When using the larger Tongxin I have peaked at 36V*11A amps i.e. 396W. So allowing for 48V and keeping the same power it would have to be restricted to smaller Tongxin to 396/48 = 8.25A. The smaller KeyDe Goldants would need to be run lower at around 6A at 48V. Regards Jerry

I am bumping this as I have had more interest recently. Jerry

Yes I was about to say I thought it was a woman lol Dave I am so envious of your visit. Did you just go there as an enthusiast to look round the shows ? Jerry

Yep it appears you can over volt them, but will certainly need to keep the current down below about 12A on the Tongxin and round 8A on the Goldant Jerry

CWAH, Not sure my contact at KeyDe is Sky. The Tongxin is more powerful in the winter when it is windy, but of course is larger and has a +0.6kg weight penalty over the lighter KeyDe Goldant. Jerry

Thanks Dave I am happy to leave it in your capable hands :) PS be sure to post some pics when your are done. Jerry

Dave you don't have any of these do you ? I would like to try one out on my Brompton ? Ps I guess I could order a few other bits from BMS to make it worth while. Regards Jerry

Yes I have moved to the KeyDe ones for my lighter folding bikes. I will be doing a write up shortly. I will probably continue to use the Tongxin on my original Brompton in the winter though. Jerry

I emailed you but it seems you have now measured them and confirmed that they are 75mm. For folding bikes where you want to retrofit a front motor, you should really use 80mm wide motors which makes things much easier. As Dave stated for more power a rear motor would be better. My view is...

UA17, Looking at the kit linked I assume its a front hub with a disk brake fitting ? If so things don't look promising :( Have a look at your front forks and if you can remove the wheel and/or try and measure the distance between the forks. I suspect it will be around 75mm wide. To spread...

Again that depends on the motor he has. Some of the cheaper batteries have a limited max current draw which will not cope and or voltage will sag with a larger motor. I think Kudos sell a decent battery for around £200 or did (prices may have gone up). As you say much simpler and can be safely...

Agreed Lipos really do require respect. On the balance charger you need to make sure you select the correct battery type/voltage and the number of cells to balance. As advised you should read up about them in terms of not over charging/discharging as the results can be quite dramatic! I...

My Battery selection, though I have a fourth option now as well. Regards Jerry

I have done quite a few folding bike conversions. The main challenge is that the front fork spacing are often narrower than standard bike front forks 100mm. Do you have details of your kit ? A bit far away (Cambridge) if you are prepared to post/bring the bike to me and depending on...