Anyone running the same size front and rear on their 3x8?

I'm running 16" rims, with 225 55r 16 tires on all four. I still have some understeer, but it's that's really pushing the car. I also have spacers at all 4 wheels for a little wider track.
Jim

 

Yes. Same size front to rear.
Are you going to track the car?

 

4 same size (14 x 7 1/2 not metric) . i hope to be able to have the 16's on it soon.

 

I just upgraded to new compmotive wheels,17x8 front with Goodyear Eagle F1 GS-D3 215/45/17 and 17x9 Goodyear Eagle F1 GS-D3 255/40/17 and WOW what a difference, I was running originals 220/55/390 metric, so far I can tell you that the whole ride, comfort,noise all changed for the better as far as steering it ' much smoother not so hard to steer, didn't have a chance to go over the speed limit...soon the weather gets better
Will post pictures soon

 

I have both 14" and 16" for both 308GTBs..

14s are the same all around of course but if you are going to the expense of new wheels the stagger front to rear makes sense IMO.

I have noticed with 16s both cars front plate hit the ground more, stock suspension in both cars. The front of the older car is pretty cracked up because of this.

Haven't spent a lot of time at the limit comparing them, 16s do give the option of the much nicer Goodyear F1 GSD3s mentioned above. I have run the GSCs on the Trans Am for years and like the break away feel from the LT1 6 spd. drivetrain there.

Don't think you'll have much trouble with that on the 3.0L...LOL!

 

Am awaiting the Kinesis 17x8 and 17x9 so am wondering... how is the clearance width? Yes, i realize it also depends on the spec offset, yet am just curious how much room the tires have to 'breathe'. Did you use any spacers? Which model Comp did you get? ALL help is ALWAYS appreciated.

 

When you guys are talking about understeer on your Ferrari'es. Is that on the real road, or on a track? How fast are you going? My brothers Opel Omega (1987) doesn't understeer in 80 mph in corners. So i am just curious how fast you are going when you get the understeer.

 

VERY It is not necessarily speed alone but also how you balance the car during turns. At the very edge it is usuaslly considered by most to understreer rather than oversteer.

 

I think you'll be fine w/225s all round. At the track you can change the u/o steer balance with tire pressures, just monitor hot pressures and if you have a pyrometer, measure temps. For the road, set at factory pressures. I don't think it'll be "twitchy" at all.

On the balance stuff, remember, if you are getting understeer, the causes are very different depending on whether it is corner entry (e.g., alignment, sway bar sizing, tire pressures) or mid corner (e.g, F -> R spring rates) etc. I'd also believe that most (all?) people can experience u/o steer effects most significantly in slower corners where you are usually being more abrupt with the handling and the impact of braking and acceleration are more significant (for example, at turn 3 at Gingerman), rather than guiding or "wishing" it through a fast corner, like the kink at Road America where you are likely doing somewhere between 90 - 110 mph.
Philip

 

I just re-read this note... I might suggest trying a 225/45. It'll still fit on the wheels and is only 3% different from my stock 308 14s. That's what I'm planning to use. They'll also fill out your wheel wells much better, as my calculations using the rough guideline that 1/2 of the space between the wheel well and the wheel should be filled with tire suggests that 40 series is the absolute minimum that would work for my 308. Just a thought. If you send me your stock tire size and the measurement from ground to the bottom of your wheel wells, I can run the numbers for your car.

 

Do you live where there are many potholes, etc? Debated 18's but for the lackluster New England streets 17's made more sense. i forget, but didn't you get a trick suspension to handle the stiffer 18s over stock 16s or ???