Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Roadster 3.7 speedo deviation

Hi Neilda,
I have a Roadster 3.7 in build at the factory and and im wondering why your speedo is ok and others arnt.One thing springs to mind is wheel diameter and tyre size.
Mine is having 16"x7" wheels and whatever tyres they are fitting at the moment.Can you please tell me what size your wheels and tyres are?
regards David