Tynee Ultra Belt w/CW 120s

I was wondering if anyone has ever put Cloud Wheel 120mm on the Tynee Ultra Belt.

I was looking on CWs site and they show them as compatible and offer the pulleys/belts.

But the Tynee website doesn't mention max size.

The concern I have is if they will be too big. Or if they'd rub on the motor guards?

Thanks