neptronix wrote:hillzofvalp wrote:I worry somewhat about the 14mm vs 16mm axle change. Seeing how some high powered crystalytes' axles have failed, I wonder if a 16mm would be more appropriate. what do you think?
Sorry zombiess, i hate throwing anything negative into a for sale thread, but i completely agree with hillsofvalp here.
This motor could easily put out 200ft-lb or more. A 14mm axle is going to be a weak spot for this motor.
I hope 16mm axles can be offered as an option, or aftermarket part.
A wider torque plate/arm won't help, the failure on high powered crystalytes occurred where the axle meets the bike's dropouts, not afterwards.
Prove my skepticism wrong, please!
Not sure exactly how to prove what you want. I sure as hell am not going to try and purposely destroy an axle on a motor I have to sell to get my money back because of pure speculation. If you are interested in seeing what happens, just wait until my drag bike is finished which will hopefully be before the Grange race. Not sure if it's going to wheelie or not with the long swing arm (20" longer than stock, 58" axle to axle), but if it can take a WOT hit from a dead stop it's going to produce 350 ft/lbs of torque on the 14mm axle. This is dumping 21KW into the controller. I'm not worried about it and I doubt anyone else will be trying to do something this crazy with one of these motors. Then again, I have more to prove than anyone else, especially since I'm the only person posting videos and examples of what they can do. I wonder what happened to the other 19 motors sold to USA customers, I've only seen one video so far besides mine.
Comparing this to a Crystalyte is also silly. The only thing in common is that they have 14mm axles and are 3 phase BLDC motors. Without any context such as how the other motors were installed, what kind of materials were used, weight, torque /etc/etc /etc it means nothing. Worrying about a 14mm axle on this motor because someone with a Crystalyte broke their 14mm axle is like worrying that this motor will have wiring issues because a bunch of Crystalyte motors did. Doesn't make any sense unless something happens, then it needs to be studied to see why it failed. I could probably break my 16mm axle by just installing my motor improperly. If installed without the flat parts flush against a torque arm/plate you can create a shear that will cut an axle if the metal is hard enough and has play in the dropout/torque arm/plate. I've heard stories of Ampedbikes torque arms cutting into axles, yet I use them on several bikes with high powered 9 continent setups and they don't even hurt the threads because they are installed correctly. 9C axles are also 14mm on most motors and one end is hollow and thin, yet I haven't read of them breaking. You must have proper context and knowledge before making generalized statements such as "A 14mm axle is going to be a weak spot for this motor" unless you've done a conclusive proper destructive test or at least an stress analysis after knowing the material and forces in play as well as the mounting method.
I can tell you that when I got my motor and realized it has 16mm axles it was a real pain in the ass to figure out how to get torque arms on it. If I didn't have access to fabricators my motor would have been sitting unused for a lot longer because I can't fabricate with metal.
Sometimes I wonder if people on this forum are building motorcycles or bicycles? I'm doing crazy stuff because I'm proving what it's capable of, but when I ride I rarely exceed 35 mph and I sure don't try to go WOT from a dead stop with the power I have, it will flip me over backwards before I know what happened.
Greyborgs goal which has been stated many times is to have a motor that can withstand hard use, hill climbing and makes a great commuter. If you want to get extreme, then you need to be willing to make extreme mods and also pay the price if you make an illegal electric bicycle. Most people wanted longer axles, including me and I'm guessing the factory couldn't supply longer axles in 16mm so this is what we have. The first batch that was sold had some pretty short axles which made installations tricky on some bikes (including mine). Even now one side of my motor uses a nut that's half the size of the stock one in order to fit with all the threads. A 14mm axle is going to work fine unless you want to do something really extreme and at that point you should probably purchase a motor that uses another type of axle.
BATFINK wrote:Any images of new frames?
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Will be in a separate thread when info is ready.
Added another video to the front page of a friend riding my bike doing some high speed flybys while I was taking video. Bike really moves.