Peter
The number after the slash is the wall height of the tyre expressed as a percentage of the width. At a width of 205 the next wall height of 60 would be approximately 10 mm higher. According to the comparison chart it would have a radius of 12.84 in or 326.20 mm, a fraction more than the tyres of the 4/4. You would have to be careful it did not touch anywhere such as on full lock on a bump.
Peter
It is the clearance on full lock for the front suspension that concerns me. With brake reaction bars fitted it is already marginal.
I'd almost prefer narrower front tyres, say 200 or 195 section. Interestingly both our modern cars have narrower fronts with a higher profile. But I suspect that taking that route wouldn't look "right" on a Morgan.
Also the winter tyres on the BMW are on 16" wheels with a 205/60 profile compared with the summer tyres on 18" wheels with a 255/35: rear and 225/40 front.
The winters give a much better and quieter ride as well, but then they are not run-flat tyres...!!
I've considered keeping the winter set from the BMW when it goes in 2016 and using them as all season tyres on the Morgan! The tread pattern is much more "retro" than the asymmetric Avons fitted from new.
So I need to re-check the dimensions to see if they will work.
