Way too big, stick with the standard 205/50 x 15 tyres, don't know about FWD drive ratio but my 90 20v quattro is geared around 22 mph per 1000revs giving a theoretical top speed of 140 at the red line and all the power is above 4000 so why do you want to drop the revs ?
Only the coupe's had the 60 seris tyres, saloons in B3 shape 20v format had 50 seris tyres, thats why the 20v coupe had same gearing as an S2 on same final drive ratio with a top speed in theory of 155 at 7000 revs. (coupe 205/60 x 15 tyre, S2 205/55 x 16 tyre, same rolling radius)
60 v 50 aspect ratio on a 205 15 inch tyre is a 7% increase in diameter way too much !
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