Anyone running 295/35 18's on the 355 rear?

Don't foget though it also increases understeer.. A LOT OF UNDERSTEER..

 

Steve, I know some guys are, it might have been Chaa.

 

i run 285/30/19 in rear.

 

I have 295 35s on my 355C I have not had any understeer problems. I do have the challenge springs on mine which are 1800 lbs./in front and 700 lbs/.in rear, so my understeer problem (as noted above), if there is any, is probably overcome by the front spring rate vs the rear. Anyway they fit fine, I can't remember if the road car wheels are the same width as the challenge wheels, I assume they are, the rain tire used on the challenge car is the 265 which is the road car tire size. My car is lower to ground than the standard car and I don't have any rubbing but again my springs are stiff as hell it takes alot to move it down an inch. Hope this helps,also there really isn't that much difference in the the width from 265 to 295s not noticable anyway.

 

19's is rather common now days in aftermart tuning.
it rides fine, handes fine. you should feel the ride is bit more harsh but on NY roads it really dont matter cuz it sux to begin with. it does not throw-off the speedo since overall diameter shall remain.
car looks WAY WAY WAY better than a 355 with stock wheels.

 

i am using PS2 295/35/18 at the back

it feels a bit slow starting from stand still, probably due to the extra 30mm of rubber on either side

 

I've been running 295/35/18 rears for several years and the handling is excellent. I also have been running 255/35/18 fronts on some HRE rims and the handling is even better and braking is better because I am running F40 front calipers. The only problem with 255 fronts is that it follows ruts in the road more than a narrower tire.

 

I just spent the past weekend on the track with 295/35/18's and can categorically state that they fit, they work, And there is no noticeable oversteer. The difference in section width is 1". In fact, the difference in circumference is equal to 47.06 feet in a mile (less distance with 296/35) or 0.88%. I don't see any oversteer in this data, although I willingly agree that the best scenario is the same size contact patch at all four corners. Since you can't get that without significantly reducing the size of the rears on a 355, there is no comparative basis as that reduction would create other issues with car control. There is the point of view that if the engineers thought the car should handle a wider tire they wouild have specificed it. I would agree with that if the only input into this decision making was engineering input. However, I think there are many reasons even Ferrari would make a decision not solely driven by engineering considerations. For instance, in 1995 were the tire manufactures making a 295/35/18? Did someone at Ferrari think there was too much road noise with the wider tires? All I can tell you is in my first sentence. Go ahead an buy the 295/35s.

 

The first two pics are 295s Khumos fitted with 11mm spacers (my choice to have even wider stance). The third pic is of the 295s P7 Rosso WITHOUT any spacers, before i changed to Khumos. And the last is of front with Khumo 235s, also fitted with 11mm spacers( again to give wider stance). No understear and feals more planted during the corners.
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I always used P7 Rossos but they did not last long. A mate of mine swears by the khumos, he has them on his 993 GT4. This is my first season with them on, and so far they are great. The car feels very planted in the fastest corners with loads of grip. I dont know how they are in the wet becourse i dont use the car in the wet. I think khumo are in fact a proven race tyre. As i have said i use spacers as well, so this shows how much room there is under the standard arch even with 295s. And there is no understear it feels like standard but with more grip.Any way so far so good.