Just stick to the 205/40's, they look big enough as it is ha
I had 225/45/17 from the previous owner and they scrubbed like hell. Why would you want anything other than 205/40/17? A more comfortable ride? You'll end up with an inaccurate speedo..
iv gone for 215/40/17s on the front of my FR which were 205/40/17 standard. im also lowered about 30mm on the front and i have no issues at all with them. definate improvement in grip. i went for the goodyear eagle f1s. dont look too different. bit wider on the side wall. check my build thead
I am on standard 1.2 suspension.
Use this tool to check out how much your speedo will be at different speeds. http://www.alloywheels.com/Tyre_Calculator
To be fair, it'd only be a 2.72% difference in the speedo reading with 225 (eg: shows 70mph when doing 72mph) so it shouldn't matter too much, however I'd only go to 215 as the sidewall width does increase despite the profile (40) not changing..
Thanks for your input, glad to hear the tyres didn't scrub. I think I may well have to take the route of 215 40 s over the 225 s. Are you using spacers on your wheels? You mentioned that grip has increased, do find there's less wheel spin on accelerating in lower gears?