Building new ebike need suggestions on a kit & bike

[ALTrooperUK]

Hi all,

First of all let me apologize, i made a thread a while back but due to life events i had to come away and sadly i think a lot of people tried to help me so inthat case it was never intentional to leave sorry.

Basically im trying to find the strongest possible bike to fit a 250w motor. In the future i will be adding a 1000w to the same exact model so ther bike must be able to carry the weight.

Any suggestions ?.

Only bike super store near me is halfords.

 

[amigafan2003]

Strongest would be a rear motor fitted into a steel framed bike with thick torque arms, but to be honest, even an alloy frame with two good torque arms either side should be able to cope with a measly 1000 watts.

I ran 750 watts on carbon fibre front forks with two properly fitted torque arms and 2500 watts on a steel front for with the same torque arms. Proper fitting (with correct c washers, torque arms etc) is more important than frame quality tbh.

Alternatively, got for a crank drive kit - then frame strength is irrelevant.

 

[ALTrooperUK]

Strongest would be a rear motor fitted into a steel framed bike with thick torque arms, but to be honest, even an alloy frame with two good torque arms either side should be able to cope with a measly 1000 watts.

I ran 750 watts on carbon fibre front forks with two properly fitted torque arms and 2500 watts on a steel front for with the same torque arms. Proper fitting (with correct c washers, torque arms etc) is more important than frame quality tbh.

Alternatively, got for a crank drive kit - then frame strength is irrelevant.

Ok cheers.

Was wondering if i should buy a mid drive brushless motor instead they seem to be easier to install on a bike ?. I saw one on ebay but im unsure if it would be ok for my height and weight. I'm 5 foot 9 1/2 and 120kg -_-.

 

[amigafan2003]

Have a look at the Bafang BBS02 in either 48v500w or 48v750w flavour. They'll be able to cope fine - in fact the 36v350w BBS01 will easily haul 120kg as well, it's just the other two will have a bit more grunt.

Just make sure the bike you're fitting it to has a 68mm bottom bracket and ideally cable operated brake (hydraulics are possible but you'll need to get inventive with the brake switches).

 

[Deleted member 4366]

Get a cheap bike with a steel frame and disc brakes. Search your local Facebook ads, Gumtree, Ebay, etc. Another good source is those guys who come round every day looking for scrap. If you tell them what you want, they'll get you one foe about £10. Don't worry if its knackered as long as the price is low, because you'll need to upgrade the brakes, gears, tires and bottom bracket anyway so that you'll get a good, strong, reliable bike. The only bit you need to start with is the frame with the disc mount on the back.

This one is perfect, but this version with the rear disc brake mounting point is not very common.:

 

[ALTrooperUK]

Thank you both amiga & d8veh.

I have another question. Say me and my father wanted to build an unbranded ebike in the future... how would we go about that ?. I mean, i know thiers plenty of bikes, but could we build our own bike... and if anyone asks say its our own make?. We have been wanting to tackle this for months but im currently doing all the research at the moment.

I would like to start the project this summer we have around £2000 - £3000 to put towards it... and we would like to build the best possible ebike for our personal use(unbranded).

 

[trex]

your budget is enough for two of these:
£650 Boardman from Halfords + xiongda XD rear wheel kit and a bottle battery for about £500.

http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_991946_langId_-1_categoryId_165499

 

[Deleted member 4366]

You need to do a lot of research, and then build something that's unique and desirable. There's many obstacles you need to overcome. The main one would be to find a way of installing the battery that's neat, practical and balanced. Are you aware of the EN15194 requirements?

 

[ALTrooperUK]

You need to do a lot of research, and then build something that's unique and desirable. There's many obstacles you need to overcome. The main one would be to find a way of installing the battery that's neat, practical and balanced. Are you aware of the EN15194 requirements?

I'm aware of the EN15194 yes.

As for the look of the bike, thats currently being designed and a prototype of the ebike will surface eventually... but it wont look anywhere near what we want, and thats because all the things to make it look like that have to be designed.

We have been eager to build an ebike of our own since 2012 my father is an engineer... over 30 years experience.

I myself have been the researcher and the person who is bascially making sure we are in the right seat to make our own ebike according to EN15194 standard of course. I will be also designing the ebike at a later time but thats not important until we find a suitable bike to build upon first.

Our biggest problem is finding a bike we can build upon... its proving to be tricky we dont want to build on something unless we have permission first and as i previously said very tircky.

Cheers!.

 

[D8ve]

If it is a limited production and you want a clear field.
May I suggest a velomobile or recumbent design.
They have premium prices and potential performance to match.

 

[ALTrooperUK]

If it is a limited production and you want a clear field.
May I suggest a velomobile or recumbent design.
They have premium prices and potential performance to match.

You sir just won the internet. velo is indeed a beauty but not what im after at all. The recumbent design bikes are nice also but not what we are after.

I think what me and my father are trying to capture is an ebike thats stealthy looking, cables hidden overall professional finish. But first as said previously we need a bike to build upon we really like the Boardman MX Comp 2014 thats the exact type of bike we need but we are certainly put off by the lightweight alloy frame!.

 

[fishingpaul]

Well done d8ve,what prize did you get.

 

[ALTrooperUK]

Well done d8ve,what prize did you get.

Aha a like and a thumbs up from me ;p.

 

[ALTrooperUK]

Ok just a little update.

Found cheap bike for £210 steel frame suitable for my bafang kit. Have also bought a 16ah 36v battery pack. The bike does not have any suspension but personally i find suspension bikes or full suspension bikes are a waste of time and costs are worthless when it comes to ebike kits.

I bought an unrestricted kit so its a 350w 22mph . I will also be buying another bafang kit 750w v2 and that will go on a super build bike project in the future when laws adapt to allow greater kits.

Cheers all.

 

[Deleted member 4366]

Is it a Bafang mid-drive you're using? If so, you don't need a steel frame. An aluminium frame with suspension forks would be better.
http://www.ebay.co.uk/itm/Diamondback-outlook-DBR-Blackrun-Mountain-Bike-Shimano-21-Speed-Alloy-disc-new-/271509220935?pt=UK_Bikes_GL&var=&hash=item3f3735ee47

 

[ALTrooperUK]

Is it a Bafang mid-drive you're using? If so, you don't need a steel frame. An aluminium frame with suspension forks would be better.
http://www.ebay.co.uk/itm/Diamondback-outlook-DBR-Blackrun-Mountain-Bike-Shimano-21-Speed-Alloy-disc-new-/271509220935?pt=UK_Bikes_GL&var=&hash=item3f3735ee47

It's a steel frame will that hampen the speed ?. The bike is a commuter mudguards and comfy seat etc but the frame is steel although i asked the guy and he says its a strong aluminium frame by ridgeback.

It's the bafang bss01 350w mid drive kit.

 

[trex]

No, I am willing to bet that the performance of the BBS01 350W will outdo the Bafang BPM

 

[Deleted member 4366]

It's a steel frame will that hampen the speed ?. The bike is a commuter mudguards and comfy seat etc but the frame is steel although i asked the guy and he says its a strong aluminium frame by ridgeback.

It's the bafang bss01 350w mid drive kit.

It'll be OK with a steel frame. The main advantage of a BBS01 is that it keeps the weight out of the wheels so that if you have a bike with suspension, the suspension can work properly. If you have a steel frame and forks, you have the opportunity to fit a strong hub-motor with serious torque, so you get convenience that no crank-drive can match.

The 350w BPM kits normally come with 22 amp controllers , which can be tweaked to 30 amps compared with the 18 amps of the difficult to tweak BBS01, so you can get nearly double the power with the BPM. You can climb any hill with 30 amps.