What is the length of that bar? And motors size? I was thinking of using an aluminum standoff spacer I have regular length hanger and use 6355 motors with 15mm width pulleys and belts. I think the distance between the mounts is 93mm not sure about that it has been a while since I measured that.
6.25 inches. Using 6374
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What do you have your brake settings at.?
i recently put it @ -40 but havent tested it yet, im currently building a fiberglass case for my electronics so cant ride at the moment.
@ Schulerbible I do always wanted to make that. I don’t have kegel wheels. can some one send me one(even damaged one is OK), or measure it for me.
yes, that will count as a single package to ship, and I setted combine shipping for them.
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I feel like I saw a super cheap set used for sale recently, let me see if I can find them.
After reading all of the good reviews I’m pretty disappointed in the mounts. The design is really good, but the two that I received had some big troubles with sturdiness after <50 miles.
The heads of the screws for mounting the motor are too small, so they dig into the metal if tightened enough to keep the belt tension. Even though the heads are too small, the screws might just be digging in because the metal is not that hard, which is what I think caused this part of the mount to bend:
The result is that the motor pulley is out of alignment with the wheel pulley, which causes the belt to slip on even moderate braking.
The metal is soft enough that I can bend it back into place by hand, but it bends itself back after ~5 minutes of riding. This happened on both of the two mounts that I received, but the one pictured is worse than the other. Maybe I just got a bad batch based off all the good reviews on here.
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oh wow, i don’t have these problems. maybe it is because i ride mostly soft and even roads.
The aluminum is pretty soft compared to other mounts, but bending it back to straight will only make it weaker over time and it will eventually break. It’s better to buy a new mount than try to straighten your current one unless you are adding more metal to help with rigidity. But there’s not much room for that.
Is the first picture one that you took? If so, it looks like you have an older mount. I’m going to run out and check my belt alignment, although I’ve only put about 20 miles on my mount so far.
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I took that picture from OP just for illustration purposes, the second picture is the one I took. my mounts are likely from a recent batch as they shipped out on September 19th. I think the issue is just the strength of the material they’re made with, the design seems pretty good. I have my motor pulley less than 1 cm outwards from being flush to the mount which might add a little bit more torque onto the mount itself, but I didn’t expect that to cause any problems, and its necessary because the can of my motor moves up and down slightly
Why do you have your pulleys so far away from the mount? Is it an option to get the mount closer to your wheel pulley? Like you mentioned above, I wonder if your belt being further away from the mount is creating leverage.
How many miles on your mount so far? And what kind of belt tension are you using?
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I understand your point about aluminium. Looking at the 2nd pic, I think you have mounted your pulleys too far away from the face of the motor mount. the tension of the belt is going to pull the motor mount outward over time for sure. closing the gap between motor pulley and the mount, I not saying it wouldn’t bend but it should be harder for it to fatigue and bend outward. Im leaving only about 1mm gap.
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Also, correct me if I’m wrong… but aren’t those motors supposed to be used with the with pulley covers that have the integrated bearing? I was under the impression that the pulley cover prevents the shaft from shifting under force. Not saying that this would have prevented your problem, but might have helped…
Video for reference: https://www.youtube.com/watch?v=y3HHv_oW_Io
I have 2 of these motors: It has issues with the can of the motor moving as described in this thread: The pulley being too close to the mount causes it to scrape, so a simple solution was to move the pulley outwards a little, it doesn’t seem unreasonable that the mount should be able to accommodate this. The added stress of it being less than 1cm outwards shouldn’t bend it so significantly in such a short time IMO, I think it just highlighted that the mounts are weak around the part where the motor clamps on to the mount.
I measured it and the pulley is 8.3 mm from being flush with the mount. Someone better at physics than me could probably figure out how much torque that would add, but it doesn’t seem like much to me
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the pulley covers don’t work with my motor pulleys, they’re meant for the hobbyking pulleys. The shaft moving under force isn’t really problem to me as the magnets of the motor and the tension of the belt prevents it from moving too far so I just let it be.
I was just about to post, I am having the same issues of the mounts bending. I am running 10s2p dual 6354, so no crazy torque, yet after around 30 miles mine are pretty bent. I’m going to try and install a crossbar Monday, I will post photos if that goes well. The design of the mounts are nice but like others said, the material is too soft/the metal too thin.
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ok since the material is softer, it could be because of high belt tension that these mounts bent. i almost have 80km on mine and no bending.