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Made with your own hands from protection for the frame. https://aliexpress.ru/item/4000987702020.html?spm=a2g2w.orderdetail.0.0.40234aa6DWv7kT&sku_id=10000013201421631

It can be replaced with a carbon body made with your own hands.

I ordered new 720W batteries. I will receive them in 5 days. I have two empty cases for 720W. I will do the assembly without the case. The 720W case has a non-removable strap, I will have to ruin 1 case in order to cut the strap from the case. To prevent the battery from swinging, TCFlowClyde...

Don't worry. You have the opportunity to throw away the 1 kg case and stick a strong adhesive tape on the aluminum guide. I would add some mounting foam inside the bike body so that the battery holds up well...

I have exactly the same steel bolt. You can see the bolt thread. In the diagram you can see the thread in the 60mm aluminum bolt. I also thought my bolt was short. I wrote to Jean again that I still need to change something in the design of this bolt.

I was told that everything was fine.

This is together with the head. I've already screwed the bolt back on. The bolt should be longer by 4-5mm. He's holding on, but not tight enough. Let's wait for Jean's response. And we will make new bolts of the required length.

I also wrote about Jean's problem. She said she would find out from the engineer. My bolt is 58mm long. The total length is 64mm. The length of one crown is 9mm . The bolt enters from one side by 3 mm. I don't have any problems yet. I think that it is not necessary to tighten the M6 bolt much...

This should be checked. What is the correct bolt length?

Let's take a ride on the new perfect motoreM820 and on the most wonderful and light frame CEF50.

He looks like a shimano. I'm not sure if it's shimano.

If you buy a 720W battery, give an empty case to a friend, then your battery will weigh 3 kg. But you need to figure out how to fix it in the frame.

Yes. This model https://aliexpress.ru/item/1005003489871838.html?spm=a2g2w.orderdetail.0.0.7d2e4aa6KmaovM&sku_id=12000028612495528 46 Ebike Store

More 21700 cells can be inserted into the frame. But it will be difficult to fix them in the frame. I'm also thinking of buying a 720W battery. But I will remove the case and leave the aluminum rod so that the battery can be firmly fixed in the frame.

I didn't see any difference between 51 and 42.

Have you already ordered a 48V motor?

45 см. Length

Oh sorry, I didn't see the 43V right away

13S4P 21700 - 720W The weight of the battery without the case is 3 kg. 13S3P 21700 - 540W Weight 2,2 кг.Or am I wrong?