Building new bike

[Dias]

Hello everyone! Thanks for all the previous posts that Ive already read before registering myself

I am no technician (besides IT) and I'm kinda...lost in building my bike hehe. Got a couple of parts including a full suspension enduro frame for a good price. So i have a few questions about going e- and about servicing the bike.

I would probably prefer a 200-300 € quality 48V/1kW+ rear drive that would get me to my work every day without pedalling (and ofc I would ride for fun in my free time, grip throttle compatible drive would be nice). I've read that Armstrong is able to reach 1,1 kW power in his peak and I want that guy in my bike . Take into account I'm a 100kg guy. Any idea which drive to get? I thought about getting Crystalyte or MagicPie. Trip distance / height profile:

I am from EU, don't mind regulations but I can probably only get EU/Chinese things since US shipping is too expensive. I don't mind charging the bike every day and no trips longer than 30km expected - so I think getting one of these Li-Ion batteries would be good enough for me. Any advice about it's capacity? I thought something like 12 Ah would be good enough.

Well that's it. Now it's time to mention I'm no mechanic either - so there are couple more problems...

This is what I got, so...anyone recognizes this fork? One pipe is probably air and the second one is nitrogen. Plus there is that plastic thing . Anyone could tell me if this fork would work and which pipe belongs to which side? Or should i go get a new fork?

Another problem is that the rear axle (185mm or something) is weld-extended or something and I don't trust it. Would a 1.4140 steel axle work? The rear wheel is crooked so it would require a replacement or fixing - I thought about getting a "motorbike like rear wheel" with proper axle, but I don't know is ebike drives are compatible with them.

Thanks for answers and have a nice day/night :wink:

 

[Drunkskunk]

Welcome to the forum.

Just about any >500w hub motor will work. I'm a Crystalite fanboy, but honestly, a generic ebay motor should work if that elevation chart shows your route. The Crystalyte HS3540 is nice, though. As for a reliable vendor, I don't know of any in Europe, but I do know one in china. Paul is well respected around here. this is his shop: http://www.em3ev.com/store/

A 30KM round trip at 32KPH needs a battery size of 720 watt hours. Generally you need 36 watt hours capacity per mile at 20mph, which works out to 22.5watt hours capacity per KM at 32KPH. So that would be a 36 volt 20 Ah battery. or if you prefer more speed from time to time, a 48V 15Ah.
(Volts times Amp hours gives Watt hours, which is the actual measure of a battery's capacity).
You'll use less power on most trips, but that sizing will get you a battery that can handle sudden headwinds, unexpected low tires, sudden needs to outrun angry dogs/cars/jealous husbands, etc, and still make it home.

That fork looks a bit like a Foxx, but it's hard to say. What it looks like even more is a nightmare for you. You can't just put it back together, and if you don't know how to properly set up and tune a fork, it's going to go very badly for you. Best to take that to a specialist and get them to rebuild it for you.

The back axle sounds like more trouble. Pics would help, but if it's not standard, and not a 135mm spaced frame, you will have a much easier time starting with a new frame.

 

[Dias]

Thanks for reply Drunkskunk. I will take your advice about batteries seriously and will take a look at EM3ev. The fork has "Suntour" on one of those pipes and the whole pack of stuff I bought was more like a scavenged bike (except the rear Epicon suspension). My frame looks like "vector" or stealth fighter a little, the rear fork is just wider. This is the one

I've already seen 200mm axle for 20 €, i guess it will do - I've found out they sell these for cargo bikes.

Good night

 

[dogman dan]

Ok looks like your bike frame is one designed for the higher powered motors out there, which are wider. Like the clyte 5400 series, or the cromotor.

You could get one of those more expensive motors, and run it on lower power, at least till you have the cash for more battery. Or, it might work ok to hunt down a lower power motor with longer axles, designed for a fat bike. I'm not sure how that would turn out.

Regular bike motors are designed for 135 mm wide frames. 135 is measured inside to inside, at the axle. It might be possible to modify your frame, but I can't tell from that picture.

 

[Dias]

To be honest I would like a mid drive kit like Cyclone but I am afraid that it would probably require drilling holes in the frame to mount it. So rear drive is the choice. An extra reason is that the rear wheel I got is crooked (hope it's not the rear fork's fault) so by getting a rear drive I would kill two birds with one stone.

I don't think I would ride the bike faster than 40 km/h (around 30 would be real most of the time) so I would like to stay away from those 5kW+ beast . I will post photos of the rear fork with dimensions when I get home.

 

[Dias]

Ok, so i made the measurements with following results:

inner fork width: 150 mm
outer fork width: 170 mm (mean each blade has 10 mm)
blade spacing for axle: 10 mm

This probably means i need a 190 mm long axle. I got a regular bike axle that was weld-extended from the ex-owner and I don't trust it. He used nuts in blade spacings to extend the axle thickness too. Any tip for the exact rear drive that would fit nicely? I checked dimensions of EM3ev drives and one of his MACs should fit: http://em3ev.com/store/index.php?route=product/product&path=50_40&product_id=52 - dimensions here: http://sdrv.ms/19m6HAh. I am not sure about MAC drives quality. Would be nice if someone could give a recommendation about it. I've read about planetary gear and I don't feel like it's a good choice since it's all plastic.