asterduc

the this ring is a part that I had cut off from a 12V motor starter. I drilled 3 holes and put M10 thread in it. This did a perfect job. M8 might have done it as well.

Tried a hydraulic Press too, that that was scarry. So I didn't finish it. The only remainig option was a ring with 3 pushers like the one showed on the video. Doing so, all pieces came nicely together in a fraction of a second. It worked and I was happy as a kid. Placed the 36 bearings, grease and all the screws and rings. Wheel back in place, all functioning properly. Happy ending. The old lady can use the bike again. I hope the ring will last for some time. Thanks all for guidance.

Tried it with the Bench Vise and some tooling, but that didn't work well.

Sure, got it from ebike-kit.nl Fitting, so far, is a disaster if you don't have the special tool. They told me it works on a Bench Vise. I tried that but wasn't succesfull. The trick here is that you need to push on 3 point all over the ring. With the Vise you push on 2 points from whih one is always close to the bearing wheel. Will make a tool during the weekend.

THANK YOU ALL for the given information and advices. I have found an outer ring that I am going to pick up later today. Hopefully it has the same size and fits perfectly. I believe at this point that is the best option for me. The bike is used by an older woman with a handicap and more speed or torque is not wanted. Therefore the low speed - low torque Tongxin might be still the better choice. I hope for her that this ring will last for some time.

thanks for the info. @ trex: Here is a picture of the part in question. @ flecc: I have also added another post for this. @ d8veh: Any other 250 Motor! could be a mini motor from Golden motor then? I think I can have these for less. As for the hall sensors, I do believe the motor has them since there are 3+5 wires coming out of the motor.

Hi folks, I am trying to help an old lady with her made-in-china eBike. The bike has a TongXin motor and the outer ring is brooken. It is clear to me this is a weak point on this motor. Question: - anyone has / or know, an outer ring for this motor - if I can't get the ring, what is closest fitting exchange motor as far as specs, dimensions and control signal Hope someone can give some helping advice here. Kind regards, Ed

hi folks, I live in Belgium and have been involved with 2 wheelers for most part of my life. MTB and race for a few decades and sincee new millenium on old classic and sport bikes (restauration). I converted a 50 year oldtimer into ebike last year. Lots of pleasure running over 35 km/hr, although the brakes aren't designed to stop this bike properly. Anyway, reason for posting here is that I am trying to help an old lady with her made-in-china eBike. The bike has a TongXin motor and the outer ring is brooken. It is clear to me this is a weak point on this motor. Question: - anyone has / or know, an outer ring for this motor - if I can't get the ring, what is closest fitting exchange motor as far as specs, dimensions and control signal Hope someone can give some helping advice here. best regards