cheers Twellsie

I got from that link

Tire Size Comparison

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
195/50-16 3.8in 11.8in 23.7in 74.4in 852 0.0%
205/40-17 3.2in 11.7in 23.5in 73.7in 860 -0.9%

So am I right in thinking the 16's would give me a better top speed?