Help with anti-slip hubs

[Neil64]

Hi guy what a nightmare I am having , I have the Heng long challenger 2 it came with metal hubs , idler wheels and metal tracks , I can only run it on carpet or concrete , if I put it on grass it de-tracking tracks it's self
So I got some anti-slip drive hubs from RC Tank legion I fitted them and the tracks don't come off but only 2 teeth at any time are meshed with the track ?
The only difference I can see is the teeth on the Heng long hubs are finner and sharper than the new hubs ?
So what do I do now I am at a total loss

New hub and old hub

IMG_20250812_194830.jpg (1.04 MiB) Viewed 452 times

[Neil64]

https://youtube.com/shorts/nQTuFxGdw4I? ... uEWaETY7eS

This may help you guys tell me what's wrong I thinks it the teeth are to fat

[ColemanCollector]

I'd overlay the new and old sprockets to doublecheck that the teeth are the same spacing and then file away if the tips of the teeth line up properly.

Mike.

[Neil64]

Hi Mike I did do that and the new hubs teeth are wider than the old one ,spacing is the same if you put teeth centre to centre on the hubs
So it's a file job , by hand or use a small grinder

[tankme]

It's that damn British engineering at work... They could've just used the same sprockets as the Abrams or the Leopard, but ...nooooo...they had to do it their way. Seriously though, there are tons of posts on how bad the Heng Long Challenger is keeping it's tracks on. Those teeth are definitely too fat. A little bit of filing on both sides of the teeth should help.

[Neil64]

Thanks guys is it best by hand with a file or dremel

[Meter rat]

Try a simple solution before you take a file to the new sprockets.
Use the old sprockets and use a washer between the drive shaft and the sprocket inner. Use a second washer between the two half’s of the sprocket. Once the tracks sit deeper in the sprockets it can eliminate the tracks coming off.

IMG_0914.png (47.73 KiB) Viewed 400 times

Hopefully my highly technical drawing makes sence?

[ColemanCollector]

I'm curious--what makes the rc tank legion sprockets "anti-slip?

Mke.

[tankme]

It's not the sprocket teeth, it's the addition of the hub that the guide teeth run in. I think it's a bad name for the function personally.

[Sub]

Hi,
I think they are called track Inducers, where they guide the track teeth in the centre of the sprocket, instead of it just floating about in mid air.
Sub.