planning a 700c commuter

Feb 12, 2019
4
0
#1
Hi all, I've been hoovering up information in the hope to get a project together to adapt a standard 700c steel framed, road/touring bike into a commuter with some assistance.

I'd just like to share thoughts and see if anyone had ideas or opinions before I fully decide on kit/components.

I've got an old electric bike, a heavy, 36v 250W giant, which is alright but it was designed as a town runnaround/cycleshare bike and I'd like something much more agile/ nimble.
I can't justify spending the money a new off the shelf bike would cost
I'd be happy with anything technical a diy ebike kit would entail. wiring/mechanics/welding/machining are all fine. I probably won't want to respoke a wheel though as, for one thing, I don't have a decent donor rim to lace.

Prefect a rear hub motor

commuting distance is ~10miles each way. mostly downhill on the way, uphill on the way back. It's for my partner, she should be able to charge it up at work. She does it occaisionally now with a non electric bike and still wants to pedal - just get home a bit faster! I'd like to keep weight lower down so aiming for frame mount battery

So lots of people here seem to use the BMSBattery site. I'm considering the Q100 complete kit:
https://bmsbattery.com/ebike-kit/61...-ebike-kit.html#/213-rpm-201/380-display-lcd3
-10Ah Battery?
-I cant seem to find much info regarding the screen/LCD/LED though. There are a few different options that seem to be priced differently but I've no idea what you get for the price difference
-assume 201rpm recommended for a 700C wheel and help up hills rather than all out flat speed.

I could just about put together a bunch of components from that site now but the kit appeals as it seems relatively good value. Interested to hear if anyone had other suggestions though...?
-Also, I take it the "tax" the site keeps referring to is UK import duty @20%??
If that's the case, it looks like ~£435 inc tax&delivery

Alternatively I have been looking at;
https://www.cyclotricity.com/uk/custom/mix-match-your-own-conversion-kit-93.html
-250/500W
-9AH Battery (??)
-LCD/PAS
-+ freewheel

Comes in at ~£515.
I like the idea of buying from the UK with all known taxes paid but struggle to justify it unless the stuff is considerably better.

sorry for the rambling first post, any thoughts/opinions/alternatives very welcome!

Thanks,
Gareth
 

wheeliepete

Esteemed Pedelecer
Feb 28, 2016
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#2
I don't consider BMS battery to be quite as popular as they were a few years ago, as there is now more choice available. I have bought bare hub motors from them in the past, but I think if you are looking for a complete kit, there are better options.
I would rule out Cyclotricity simply because it's a heavy direct drive motor which offers no advantage over a much lighter geared hub, esp. on hills.
Take a look at the kits that Woosh offer, a bit more money, but UK company with excellent CS and trade members on this forum.

http://wooshbikes.co.uk/?hubkits

The Yose Power kits are also good value and shipped from the EU, so no tax to pay at the moment. Quite a few on here have these and they are proving reliable.

https://www.yosepower.com/en/category/rear-motor-60.html
 
Feb 12, 2019
4
0
#3
Hi,
Thanks for the quick and informative reply.

I don't necessarily have to buy a complete kit but as I need all the constituent parts anyway, I figured buying it in kit form was likely to be more cost effective?

Like the look of both of those kits and the Yose Power one seems very competitively priced.
I'm not finding it easy to make a sensible comparison between them (or indeed various others) though.
I understand enough about physics, electricity and the like to know that the woosh kits for example aren't going to be putting out 250W if the controller is hosing through 17A at 48V.

So, any tips on how to get my head around how the different ratings of different components are likely to relate to real world performance so I can try to make a sensible decision on what's appropriate?
Maybe there's a resource I should be reading somewhere...

Thanks again,
Gareth
 

Nealh

Esteemed Pedelecer
Aug 7, 2014
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#4
48v will have more torque then 36v given a similar ( within 2- 3a) amp rated controller and more speed if you were to be naughty. Acceleration from a stop will be better.
The main difference is in PAS 5 the torque/power for inclines is mighty at 48v, though the other PAS levels will be a bit stronger. PAS 5 has 50% more power then PAS level 4.
 
Feb 12, 2019
4
0
#5
Thanks, that makes sense.

I'm probably leaning towards the Yose kit though, it's hard to justify the £150+ step up. Is the controller in that 36v Yose kit rater the weak link in the setup? rated 7A (max 15) sounds a little weedy. Or maybe there's just confusion with how different companies determine their continuous/max ratings.

Thanks again,
Still interested if there aree any other vaguely sensible options.
 

wheeliepete

Esteemed Pedelecer
Feb 28, 2016
1,121
132
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Devon/Dorset
#6
It's tricky comparing kits from different suppliers, there are always parts you would prefer from all of them. The alternative is to cherry pick parts from different suppliers and build your own kit, but this does take a considerable amount of time if your knowledge is limited. What I would say if you are trying to see the price difference between Woosh and Yose is 1, Woosh kit a little more refined, less excess cable to hide, 2, branded cells in the battery, not generic Chinese ones, 3. Branded motor for which parts are available, bit of an unknown on Yose kits, and of course Woosh are UK based, so any problems you have will be quickly and easily solved, although Yose do seem to respond well with regards to replacing items that fail or arrive damaged. This being your first build, I wouldn't worry too much about the 15 amp controller, if you get bitten by the ebike bug you will soon discover there are ways to MORE POWER!!:p
 

Nealh

Esteemed Pedelecer
Aug 7, 2014
6,609
271
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West Sx RH
#7
The Yose is 15a max power output so @36v so about 430w max output at the wheel, the 36v is very capable. At 48v and 17-20a it is the business if you want it to be.

Comparing price to the likes of Woosh is unfair as Woosh give great CS and backup here in Blighty and this is factored into the pricing. Also Woosh hubs are Bafang a proven brand with a good reliability track record. As yet the Yose has been reliable but needs a longer track record of say 5+ years to say it is equal or a sgood reliability wise.
 

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