328 Larger Tires ??help??

Those are too tall. Use 225/50 on the front (stock rear size) and 245/45 rear. Unless you have a compelling rerason, I would recomend it against it. The larger tires will increase unsprung weight and require more steering effort while giving you very little extra grip.

Dave

 

Have you seen this thread? http://ferrarichat.com/forum/showthread.php?t=53089

I run 225/50 ZR16 front 245/50 ZR16 back and have had no issues.

 

I have a 328 which I did have larger tires. Notice the past tense. Just recently, I changed them to the original sizes and it drives much better. Also, trying to put the larger tires on the rims not designed for them makes it much more difficult. Other than paying more money (a joke), I DO NOT RECCOMMEND it. Just my $.02.

Mark Manzonelli

 

I rode with Mike Charness in his 308 QV which has this tire combination on it and the grip was incredible. The ride was fine and the tires did not look too wide on the car. I suppose one negative is increased steering effort at low speeds.

 

I know several people that have done this...works fine. I did it on my 308GTS, but as suggested, use the 225/50/16 and 245/45/16. Ride is good, handling and grip excellent.

 

I strongly suggest you fit the correct and original size so 205/55-16 at the front and 225/50-16 at the rear. I have extensively tested the 205/225/245 combination on the track with street and "R" compounds, the car fitted with a 225/50 and 245/45 tyres was no faster with the wider tyres. In fact, on the tighter circuits, the car was slower. Added to that, the 225 reduces the nice turn in which is a feature of the 308/328 series cars. You have to ask yourself, why does Ferrari fit a 215 section tyre to the front of the 360???? The 308/328 series cars have too much compliance in the suspension to take advantge of the wider contact patch when cornering. In all the instances where people have made claims that that the 225/245 section is better they have come from a 15 year old set ot XWX's or worse, some crappy el cheapo 205/225 combination.

I will stand corrected if anyone can show me some data where the stopwatch compares the 205/225 combination with the 225/245 combination in the same compound on the same car where the wider tyres returned a faster lap time.

 

Hard to argue against a back-to-back comparison on the track.

I'd also suspect that going ~1" wider on the same rims would result in less responsive steering & more sidewall flex through the corner for the same tyre model/compound.

 

Carl888 is right. I used for a while 17 inchers with 225's and 245's both road and track with Bridgestone S03's on both sets. After about 1K with the 17's, I went back to the originals. I did not do back to back timed runs but judging by how it ran against a friend's QV in both instances, any change in times were minimal. I'll reiterate my former comments about unsprung weight. To those who do want to upsize, I would recommend 215's in the front and shop for light weight tires.

Dave