4motus / cromotor DH bike build
- Thread starter crea2k
- Start date
kudos
10 kW
crea2k said:
You're certainly racking up the sheets mate! You must be well over 3 grand by now already
but it'll be worth it.I wonder if any forks come with a long enough steerer as standard ??
Kudos
lol yes and the rest !, I don't want to have a load of decent parts fall apart because of one cheap one though, so gotta do it right !. Its not a standard steerer, its been cut as was off a brand new bike, resold, so probably would have been cheaper to just buy a retail one.
Ohbse
10 kW
This is very inspirational, I can't help but plan my own 4motus/cromotor build! I've been doing some sketchup modelling and you can fit a pretty staggering amount of 18650's inside even the smaller of the two battery case options. 3kwh+ of high power (HE2/25R or VTC5) is very possible and should support 150a peaks without being too stressed.
22s15p sounds good to me (other than the price)
Are you going to mount the controller internally?
22s15p sounds good to me (other than the price)
Are you going to mount the controller internally?
Yes, its just the price, anything other than lipo was going to cost such an astronomical amount of money it would have been like half the price of the whole project. Yes im mounting the controller internally, removing the case and mounting it directly to the box itself, so it acts as a big heatsink.
We have new stuff ! :
Brake disk the size of a dustbin lid for the front wheel :
View attachment 2
New lower crown / steerer assembly as the other was too short :
Brake disk the size of a dustbin lid for the front wheel :
View attachment 2New lower crown / steerer assembly as the other was too short :
kudos
10 kW
Looking good, what size is that front rotor ? Looks bigger than 203mm.....
Edit: Ah yes I see from your other post it is a 203mm.
Also, did you get your wheel trued at your LBS?
I was checking out the new raptor 140 battery volume but now that it's only 140mm wide you can't lay lipo horizontally which is a huge shame.
However it looks like the 4motus can take more lipo than the 140 and it's a lot cheaper - win win !
Kudos
Edit: Ah yes I see from your other post it is a 203mm.
Also, did you get your wheel trued at your LBS?
I was checking out the new raptor 140 battery volume but now that it's only 140mm wide you can't lay lipo horizontally which is a huge shame.
However it looks like the 4motus can take more lipo than the 140 and it's a lot cheaper - win win !
Kudos
Yes, 203mm and 160mm , I may upgrade the 160 to a 180 possibly, that's just the one that came in the set.
Iv not got the wheels trued yet, im going to drop the front off and get the shop to do it for £10 , as for the back I might do it myself once the controller arrives, as its a pain in the backside to spin without any power going through it, so im not sure if its possible to true it, but il have a look once iv got it bolted in properly.
Yes I looked at the Raptor before this, but its about double the price, plus I don't like the controller shield thing that's open to the elements, would rather strip it down and mount it inside.
Iv not got the wheels trued yet, im going to drop the front off and get the shop to do it for £10 , as for the back I might do it myself once the controller arrives, as its a pain in the backside to spin without any power going through it, so im not sure if its possible to true it, but il have a look once iv got it bolted in properly.
Yes I looked at the Raptor before this, but its about double the price, plus I don't like the controller shield thing that's open to the elements, would rather strip it down and mount it inside.
sigimem
100 W
Awesome build very nice components you choose.
I am espacially interested in the cromotor adapto combination.
Only issue there might be IMO that the Fox rp shock can not hold that big cromotor in terms of damping its mass.
I am looking forward to see further progress
I am espacially interested in the cromotor adapto combination.
Only issue there might be IMO that the Fox rp shock can not hold that big cromotor in terms of damping its mass.
I am looking forward to see further progress
Obiwan007
1 kW
Freewheel options are limited with the width of the Cromotor as I found in my recent build crea2k. I had my DH Comp swingarm modified to 155mm and did some other interesting things to the disk adapter and the freewheel adapter on both sides of the motor to gain some extra space. This allowed me to use a three stack freewheel (hard to find). The details and photos can be found in the build thread here on the first page:
http://endless-sphere.com/forums/viewtopic.php?f=2&t=55605
Obiwan007
1 kW
I went with a 56 tooth rennen chain ring on the front since the smallest you can fit on the back is 14-16 tooth. This allows meaningful pedaling up to about 28 mph.
My other bike accepts a 7 stack freewheel which allows you to get down to 11 tooth. Much better for higher speeds. But 11 tooth becomes impossible with a motor this wide. Obiwan
My other bike accepts a 7 stack freewheel which allows you to get down to 11 tooth. Much better for higher speeds. But 11 tooth becomes impossible with a motor this wide. Obiwan
Obiwan007
1 kW
Yah, without the ability to use a large front ring it becomes very difficult to get pedaling capability in the higher speeds. Fortunately mine had the room. The three speed freewheel I used on the back is a real piece of crap but seems to be working fine for now. One other option for you might be the white brothers eno dos.
These can be acquired in two sizes but they are quite spendy. Obiwan
These can be acquired in two sizes but they are quite spendy. Obiwan
Obiwan007
1 kW
You may still need to counter bore the freewheel adapter bolt heads if the single speed extends beyond the dropout bearing surface. Don't worry though single speed is still great fun.
bikerloosey
10 W
- Joined
- Jun 9, 2014
- Messages
- 82
That frame looks killer. Did you buy that from http://www.wimbikes.co.uk/ ? I would be ticked to buy a stealth for £5826 and have it break. Your frame likes really good.
crea2k said:
bikerloosey
10 W
- Joined
- Jun 9, 2014
- Messages
- 82
What kind of pricing are they looking for on that frame? How long to receive? Weights on your build? The cromotor is really the way to do it I see.
It was around £600 ish, its the stainless steel one, the aluminium one is around £700 , it took a couple of weeks to arrive, I'm not sure on the weight of everything to be honest, im going more for a mountain bike / motocross bike halfway house, so not overly worried about weight, I know its not particularly light, but its built like a tank, so I don't expect it to be. Yes for the cromotor you need the stainless steel frame unless they can do you a one off aluminium frame with stainless swing arm.
bigsi
10 W
Rs do a dc circuit breaker rated at 60 amp 80 v for 8 quid. Any good?
