Markhor Rocket - major mechanical issue

[azure]

I bought this frame with Bafang M510 engine from one of the most popular sellers.

After several weeks of waiting (painting, completing the order, shipment), I finally received the products.

First I tried mounting the motor to the frame mount. What was my surprise when I found that the holes in the frame did not coincide with the holes in the engine.... When I put the screw into one of holes it cannot be done to others. I measure distance between holes in motor and in frame and they differs.

I tried many ways, had removed the paint residue from the mounting holes (as suggested by the seller), but the misalignment is so large that mounting the motor is impossible.

Have any of you had a similar problem (maybe with other manufacturers frames), or am I the only one with such bad luck?

At this stage, the problem has been reported to the seller, photos taken, videos recorded showing the problem. I am waiting for some information, but the season is running away.

 

[azure]

Some pictures of the problem... after inserting the bolt into the front hole, the top center hole and the rear hole do not match the motor mounting points.
There is no option to insert front bolt and rear or middle bolt together.

There is an offset, slight at the rear and about 40% in the middle....


I made a video describing this to the dealer and am waiting for a new front frame. The worst part is that I am about 4-6 weeks longer without a bike because of this situation :/.


It looks like the problem occurred during welding, where the operator didn't install the motor mount properly and the welding pull off the mounting holes.
If it would be a result of mechanical failure, only the rear holes would have been displaced.

So - if you are ordering a frame, ask the seller to check that the motor fits the frame mounts before shipping.
It goes without saying that the two should fit together (if, of course, the frame is dedicated to a specific model of motor), but as this example shows, there may be a problem.


Putting aside this unfortunate problem, the overall build quality of the frame is really good. I hope the new frame will be as nice as this one, and will fit the motor and will arrive before ond of June

 

[azure]

It is time to write a summary.
Thanks to the seller's professional approach to the problem, I received a new front part of the frame, which perfectly fits the motor's mounts.
Therefore, it is very important to buy from reliable sellers, because a mistake can be made by anyone, even the factory.

At this point I would like to thank Chili Shen and Tars of Changzhou Fieldebikes for understanding the problem, providing great service and sending a second frame. As I talked to them, they added checking this frame element to their checklist before shipping.

My bike is finished and I am very happy with it. The quality of the frame (welds, grinding) is really good. Geometry fits me a lot.

 

[freextr]

Is there anything you found out while building and share with someone thinking of doing it too? Any special tools?
Is the cable management and battery fixation good so no rattling noises or it needs to be taken care of? All ok after almost one year?

 

[azure]

Well, if the geometry of this frame suits you, I would say buy it.
You will get a good quality frame with nice weld cuts.
The cable routing could be better designed as there is a tunnel where you have to route the cables. I've used foam tunnels to quiet the cables. Battery box is really well fitted, there is no any space to rattling.

You will not need any special tools. I've done about 700km, all is fine. I really like this bicycle.
There is only 2 things which could be improved:
1. for 29inch rear wheel upper link of rear triangle should be welded 10mm higher.
2. it will be nice to have mount for sidestand

 

[freextr]

Well, if the geometry of this frame suits you, I would say buy it.
You will get a good quality frame with nice weld cuts.
The cable routing could be better designed as there is a tunnel where you have to route the cables. I've used foam tunnels to quiet the cables. Battery box is really well fitted, there is no any space to rattling.

You will not need any special tools. I've done about 700km, all is fine. I really like this bicycle.
There is only 2 things which could be improved:
1. for 29inch rear wheel upper link of rear triangle should be welded 10mm higher.
2. it will be nice to have mount for sidestand

Nice to hear that all is so well-made. I'm planing a mullet setup and coming from a 26" bike - out of this sport quite some time
Any photo of the foam tunnels you used?
Does the frame come with any instructions like max force for the bearings or the cable routings?

 

[freextr]

Forget about the last question, I will figure it out. More, I am interested in the data of two things. The geometry specification says that the seat angle is only 71 degree and the chain stay length 47cm but from the comparison with kunlun Id say its the same where kunlun have 77-degree angle and 45,4cm for the chain stay.