Alternative tyre size.

[SwallownAmazon]

Just a thought:
Has anyone fitted 205/60 x 15 tyres in place of 205/50 x 15 to an Audi 90 20v to reduce revs at a given speed? I know the speedo will be out but surely can be recalibrated. I am not interested in ultimate performance/roadholding, just driving around in a comfortable highish performance car that has given me a lot of pleasure over the years. My tyre dealer friend says that 205/60's were fitted as standard to Audi 90's "back in the day"; is he right or just going on number plate recognition software that may or may not be correct?

Rocket ship should be back on the road this week after the cam belt change and a few other niggly little things have been put right by the bloke who has looked after it since we acquired it in 1994. Sadly, I don't have the facilities to do major jobs on it now, especially as I can't get up off the floor without rolling over onto my front - old age!