The standard fitment Pirelli P Zero Corsa tyres are great when warmed up in the dry, when it turns wet (or cold) it's a completely different story! Probably the best 'all round' (pardon the pun) tyre currently available on the market is the Michelin Pilot 4S. However whilst the Michelin Pilot 4s tyres are technically made in the correct sizes of 245/35R19 and 285/30R19 (non run flat), they're simply not readily available. Go on, try finding a set and let me know where you can get them?
The alternative is to go 10mm wider front and rear to match the rolling radius between axles.
I've tested the 255/35R19 and 295/30R19 combo in this video showing that it is possible and getting a little more rubber in contact with the road isn't a bad idea either.
Enjoy, and don't forget to subscribe.
Ed

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00:00 Introduction
00:21 Thanks for watching, commenting.
00:36 Correct pronunciation of Quadrifoglio
01:18 More driving content
01:40 Future video plans, a study into a GTAm beater!
02:00 What's Back Road Hero all about.
02:45 What's this video all about?
03:50 What future content would you like to see?
04:19 The one modification you simply MUST do.
04:35 Why up the sizes? Standard sizes are not readily available in the 4S.
05:14 He's a very naughty boy!
06:33 Shameless plug for my racing channel at e46Racer! (   / @e46racertv  )
07:00 Speedo correction.
07:15 Did you know that the GTAm uses Michelin Pilot Sport Cup 2?
07:30 Why use the Sport 4S?
07:55 New tyres are fitted?
08:40 Resetting the TPMS and finding the standard tyre pressures.
09:00 Driving, first impressions
10:05 2 minutes of having fun out on the road.
12:00 Noise levels, and speedo correction. 60mph indicated is now 58mph GPS.
13:00 Final thoughts
13:58 Please subscribe.
14:10 Coming next. New video will be on our 1933 Morris Ten pre series.