So far I think all the JH600Bs (sidecar) are registered in Huzhou or other "towns of convenience" in Zhejiang -- but only because Shanghai has not yet done what it did with my JH600 and enter it into their database of approved models. (Yes, mine supposedly was the first, and they took a ton of measurements and scrutinized the factory data sheets, etc.) So those ZJ-plated JBs probably are not welcome inside the Inner Ring. We do expect that Shanghai eventually will allow local registration with a 沪A downtown or 沪C suburban plate.

cheers