Full Suspension Frame (Was Carbon Frame)

I would think bad idea. Clamping some kind of torque plate on is likely to put a strain on the frame in the wrong way. With carbon, do that and snap.

It could be possible to reinforce a carbon frame though, if you have the right resins and the carbon and know what you are doing. Maybe you could fill in the web between the seat stay and the chain stay with a flat carbon plate, and then have a good place to bolt on a torque plate.

A carbon, or even alloy frame designed to have a steel rear dropout plate bolted on would be cool though. You'll never see pedal designers make it though.
 
I agree with Dogman. All the carbon frames I looked into had very little contact area for the dropouts. They just don't have the surface area to take the torque of hub motors without some serious mods. A mid drive setup would work.
 
I'm with dogman and kfong on this.

You are, imo, pretty much committed to using CF for exactly what it was initially designed and "laid up" for at the factory. This, and the somewhat similar "negative" aspects of aluminum, often tend to make steel frames or steel dropouts the easiest to work with in regards to electrification.

BTW, does anyone here remember American road racer Freddy Spencer's horrific high speed crash when the CF rear rim broke up on his factory Honda?
 
I have a Trek 1200 with a carbon fork that I'm building with a small Cute 350w hub motor. I opted for the rear hubmotor just to avoid the carbon. It's a great material, but unforgiving when it comes to hubmotor torque I think.
 
I see.. I just asked because I have a FS carbon frame laying around.
Im actually looking for chromoly/steel fs frames, and they virtualy non existant. Does anyone know anyone that make chromoly fs frames?
 
Chrom-moly frames are hard to come by. Mostly replaced with aluminum as the choice for bike manufacturers. You would need to go on eBay, pinkbike or craigslist and find older bikes made before aluminum became popular. Some smaller companies that build custom frames would be another avenue. Aluminum, DH frames are quite strong, this is the route I'm going with on my next ebike. Some of them have drop outs you can easily replace. You could always build your own frame, I was starting to go this route, but was worried about the final performance and outcome, I still might one day.
 
My first E Bike was a Trek 9800 hardtail CF MTB, but I was using an Aotema front hub with a cro-mo front fork. Pretty harsh ride. As far as a mid-drive on a CF, I considered that, but you still have to clamp that motor somewhere so I don't think a mid-drive is a great idea either. CF would be great if it was designed to b an e-bike, but I don't think that is going to happen any time soon except people doing it in their garages.
 
Only thing still out there with a steel swingarm that isn't a $100 wallbike is the mongoose blackcomb. A now laughable looking Y frame, and not strong by todays measure. It fits my low standards for quality and high standards for cheap. They musta made a lot of em, because you can still get one new, and the price keeps dropping.

I couldn't say whether the bearings and bolts on the swing arm would be in any way compatible with modern FS frames. If so, it could perhaps be possible to adapt the steel mongoose swingarm to the contemporary frame. Likely you'd have to weld on the top end to make the shock mount different, and fit what you have on the existing FS bike.

Some, notably John in CR's latest creation, simply fabricate a steel swing arm to fit their good frame. I think that is the way to go if you can weld at all. Allows all kinds of mods, like longer wheelbase, etc.
 
bloody hell... its impossible to find a decent chromoly frame...

I might as well get another greyborg frame
 
Don't know where I ran across this, may have been a post here on ES. You don't have to speak German to understand the results:
http://www.youtube.com/watch?v=nvk63bmVpck
 
gensem said:
bloody hell... its impossible to find a decent chromoly frame..
Click to expand...
Brooklyn SR6, SR8, Race Link http://www.brooklynmachineworks.com/index2.html
viewtopic.php?f=28&t=16289
2.jpg


Avanti (Keewee ) D8 (no longer made) viewtopic.php?f=6&t=15066
D804-1.jpg


Keewee Cromozone (no longer made) viewtopic.php?f=28&t=23861
271603cromozone.JPG


Dobermann Fabrication Le Pink http://www.dobermannbikes.com/en/products/slopestyle/lepink
p4pb4087062.jpg
 
I saw the doberman before... you know the problem with theses bikes/frames, the manufacturers charges way too much for a steel frame... that why I said another greyb is a better option.
 
kfong said:
Chrom-moly frames are hard to come by. Mostly replaced with aluminum as the choice for bike manufacturers. You would need to go on eBay, pinkbike or craigslist and find older bikes made before aluminum became popular. Some smaller companies that build custom frames would be another avenue. Aluminum, DH frames are quite strong, this is the route I'm going with on my next ebike. Some of them have drop outs you can easily replace. You could always build your own frame, I was starting to go this route, but was worried about the final performance and outcome, I still might one day.
Click to expand...

if you want a aluminium dh frame with removable dropouts that works look for a norko aline :wink: ... axle nuts? what are they?
 
That looks decent to me. Not impossibly hard to fit a good torque plate to it on the rear. I like the adjustable shock mount. Allows you to run just about any length shock you like on it.
 
Both those look good to me. The buy it now one you can get for sure. I have an FSR I like a lot, but it's an auction. I won't big high enough to ever win an auction. I just won't outbid the shill bidder.
 
Anytime I hear or read carbon fiber mentioned when thinking about a e-bike or really anything high speed that needs to take serious amounts of stress I think back to this video. It really gives you something to think about.

[youtube]nsNnGZZusiQ[/youtube]

Carbon fiber is strong but it has to be assembled in the right way to be able to withstand stress from odd angles. Such as the force imparted from a hub motor.
 
Im really starting to like the Fastrax CFD 2000 frame...

Btw does anyone know if aluminium+scandium frame like the one above is stronger for ebike usage?
 
Hi.
My new bike has a carbon HT frame (1.2 kg)with a 1000w rear hub on it and it's eats 5Kw of power. Just get a controller with the ability to limit motor current and turn it down to safe levels for the frame (slow off the line) and make a custom torque plate that connects to the disk break frame mounts + on the other side a torque plate that’s has a connection point with the rear derailleur mount. Carbon frame is not the best but I think its as good as alu for its easier to make the carbon frame stronger with epoxy and carbon then to weld hardened alu.
 
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