Topic: 20mm offset sprocket needed

[kjs5013]

So, like the title reads, I need a 20mm offset sprocket to try and cram a 180 tire into a 1975 CB750F. Cycle Exchange has pictures of one that they used to carry on their website, but when I emailed them about it they let me know that they no longer stock them. I can find 10mm/ 3/8" offset ones, but no luck finding a 20mm one. Does anyone know anywhere where I can aquire one?

Thanks in advance!

[69cb750]

Can you cut a slot in the tire for the chain ?

20mm = .787"
Two sprockets with spacers between, drill sprockets with carbide bits, bolt together, weld both ends so it stays together.

[kjs5013]

Yea, and I know there are places that make custom sprockets as well. I was hoping to be lazy and someone makes one that I can order. When it comes to something odd like this, the only way maybe to make it myself.

[bryanj]

Dont forget you will then need to move the front sprocket and probably space the cover out and extend the gearchange shaft---------20mm is a big move

[kjs5013]

I definitely appreciate the heads up, I figured I was going to have to push the cover out, but didn't give the gear change shaft much thought.

[kjs5013]

Does anyone know if a 77-78 sprocket carrier will bolt up with ny 75 F motor? Apparently they are offset by 10mm to allow for a wider wheel from the factory. So, if I can bolt that up, and buy a 10mm offset sprocket, then I can get my 20mm total.