The +4 was never fitted with 17 inch wheels and tyres , but as Rob says above, 16 inch rims with cross (bias) ply tyres were standard in the 50s.
The whole world has changed away from cross plies since then , and a 165x 16 radial should be pretty good, however you may need to check the clearance against the silencer at the rear , and the top cross frame mount at the front. If there is fouling, consider going down to a 155 x 16.
The alternative is to look for a set of 15 inch wheels , this will give you a wider range of tyre choices.
Last edited by MOG 615; 06/05/21 09:13 AM. Reason: Poor poof reading
