Would like to put a larger set of tires on the front and back of my CS which currently has the standard set of 19" rims. Does anyone have any idea of the maximum size I can put whilst maintaining the correct rolling diameter and not hitting control arms or fender bending. Any help is appreciated.
Thanks for the calculator, it will come in handy but additionally, are there any CS owners that have but a different or larger tire on the stock 19" CS rims? Cheers
Too wide or too narrow - does it make a difference? A rim that is too narrow in relation to the tyre width will allow the tyre to distort excessively sideways under fast cornering. On the other hand, unduly wide rims tend to give rather a harsh ride because the sidewalls have not got enough curvature to make them flex over bumps and potholes. That's why there is a range of rim sizes for each tyre size. Put a 185/65R14 tyre on a rim narrower than 5inches or wider than 6.5inches and suffer the consequences. Ferrari 360 Modena Alloy Wheel Size Tyre Recommended Tyre to Rim Size Height Width Details Min Width Max Width Front: 18" x 7.5" 215/45 ZR18" 18"x7.0" upto 18"x8.5" Rear: 18" x 10.0" 275/40 ZR18" 18"x9.0" upto 18"x10.5" Ferrari 360CS Alloy Wheel Size Tyre Recommended Tyre to Rim Size Height Width Details Min Width Max Width Front: 19" x 7.5" 225/35 ZR19" 19"x7.5" upto 19"x9.0" Rear: 19" x 10.0" 285/35 ZR19" 19"x9.5" upto 19"x11.0" Max Tyres for stock CS Rim Sizes Front: (stock 225/35 ZR19"), 230/35 ZR19" Rear: (stock 285/35 ZR19"), 295/35 ZR19", 305/35 ZR19" As you can see from the above information Ferrari did not change the alloy wheel rim width's between the Modena and the CS (they are identical), they simply upped the tyre width by 10mm front and rear and lowered the profile and went up an inch (with same rim widths) for style and brake disc clearance reasons. This obviously presents problems for going to larger tyres than stock because your hitting the limits of acceptability for the correct tyre to rim dimensioning. For instance the Front tyres on a skinny 7.5" front rim are pretty much at the maximum size you can go to (may push it out from 225 to 230 but thats it!). The rears can go a bit wider but nothing more than 305's. This means to go much bigger you need new wheels! Hope this helps,
Yes thats perfectly fine sizr on a 10" upto 11.5" width rim. I wasnt calculating the rolling radius differentials, mainly just the width to tyre suitability. Just be careful going up too much at the rear and not changing the front by the same amount as you could upset the cars balance. Typically when you go up at the rear you also do the same at the front too for balance.
I believe there is one other consideration, at least for a 360. I changed to 225/40 ZR 18 front and 275/35 ZR18 rear and this has caused the ASR to come on under heavy cornering and the car to bottom out on back roads that appear to have rather steep inclines. I can turn off the ASR, especially at the track, but am concerned with bottoming out in normal driving. Rob in Potomac
Sounds like you need 20%-30% uprated springs, cs flamblocks (bushes) and a thicker rear anti-roll bar. These changes will allow you to get the best benefit from the wheel/tyre setup you now have. In addition if you fit the suspension ecu software (requires eprom flasher, experience, etc.) or just buy the 360cs suspension ecu you'll eliminate the ASR light problem as its thresholds are programmed a lot higher. Thats essentially the main elements of cs handling package upgrade (oh and the weight loss). Or depending on what you use your car for (mostly trackdays?) you can go more extreme and fit a challenge suspension setup - bit harsh for normal fast road though hence perfect compromise for road/track use is the cs suspension setup. Trev
Thanks, that is very helpful. As of now, I am only tracking less than 8 days a year, so not certain I want to modify, but your suggestions are what I was looking for, at least to consider. I figured I needed at least new springs and had to do something to the suspension settings. Rob
So if the 305/30/ZR19 are fine for the back what would be the maximum sizing in a 35 profile for the front to maintain the car's balance and rolling diameter? Again, these will be going on standard CS rims Cheers
Thats the problem, with only 7.5" width fronts the max you can go without problems is only +5mm up, i.e. from 225/35's to 230/35's. 235's are really needing 8.0" or more, too much tyre for the rim itself. Trouble is Ferrari used the same width 7.5 inch rim size at the front of the CS as they did on the Modena and it only ran 215's. IMHO the CS rims should have been 8.5" at front and 11.0" at the back. This would have give people the option to go with larger tyres on the stock rims. Technically if you go up a size on the front you should do the same on the back, so you could go from stock 285's to 295's and still keep pretty similar 'balance', +5mm extra on the back compared to front should not make any noticeable difference to handling over stock tyre dimensions. If you got for 305's at the back you wont have enough grip at the front compared to the back and you'll change the balance of the cars, too much rear end grip compared to front end grip - this is all because you cannot put 245's on the front, you need more rim width! That extra 1/2" makes all the difference, Size Matters! LoL! Thus i think your going to be a little bit stuck with changing the wheel to tyre dimensions from stock if you want to go larger on standard cs alloys. Its a mess TBH!
