If you run 255 on the front you can keep your 295 in the back Sent from my SM-G930F using FerrariChat.com mobile app
255 and 315's migh be an issue. Not sure whether or not the ABS will play along. How much thread is left on those rears anyway? Of course none of us likes to spend money on something we don't have to, but if your rears are old and over half way down, getting a full set makes perfect sense. Then you can plus size if you want. The size TT runs is available in a few variants, including the MPS4S. Sent from my SM-G930F using FerrariChat.com mobile app
He runs 245/40R19 so he has no more tyre profile than what you got, just smaller diameter overall. You are actually better off as wheels with larger diameter takes a more shallow angle of attack when hitting a sharp edge, and the don't drop as deep into ruts and potholes. The only way you could benefit from a 19 would be to run 245/45R19. Sent from my SM-G930F using FerrariChat.com mobile app
If 315 is too wide, 295 is just right? Yeah they are old, but I'd rather do a few more burn outs or something before I replace them entirely I got a great deal on the 255/35/20 Micheline Pilot Sport 4S - 259$/tire I'm going to discount tire to get them installed and have them do the road hazard warranty Same tire was like 285$ through tirerack and discounttiredirect
For the first time in 22 years im giving up on dedicated snow tires for daily drivers. Around nyc the roads are plowed as soon as the snow comes down. Having second sets of wheels for half a dozen cars has gotten old. Actually switched to contis for my suvs and they’re remarkably more comfortable than the michelin ltx that ive been running. Looking forward to an ff winter with contis.
Once again you are wrong. The FF should have come with a 19 front right from the beginning. There is zero benefit in increasing diameter, its all about increasing TIRE SIDE WALL. On a 245 35 20, you're getting a 86mm sidewall, on a 245 40 19 you're receiving a 98mm sidewall. Both have identical 680mm overall diameters. Meaning you're getting almost 1/2 inch, or 10mm of added sidewall. Which is huge, especially for a 4500lb car. Need I remind you that the rear side wall, 295 35 20, has 4.1inch, or 103mm of sidewall? I mean a 20 front with 85mm of sidewall vs a 20 rear with almost 105mm of sidewall looks ridiculous and lacks any proportion. Recommending that owners should run oversized tires, just to keep a front 20 is just stuffing a band-aid on a problem that can be easily remedied and nonsensical.
245 40 19, I think the side walls looks much more even with the rear, and at the same time you retain factory rolling diameters, which the Ferrari ASR system was tuned for. Image Unavailable, Please Login
those 19s dont look bad. i dont recognize them off top of my head. were those cali wheels? will any of the later model 19 inch wheels work?
No I am not wrong. You do get added benefits oversizing on the 20's. Aside from getting the sidewall, you get the following. Bigger diameter which decreases the angle of attack on edges. You get a radius which don't go as deep into holes and ruts. You get a larger volume which also offers additional cushioning. Look is subjective. I like the fact that it fills the arches better, and from a proportion standpoint, I think the 19's in the front look too small. The FF and Lusso are big cars, and you don't see people complaining about the tyre proportions on the TdF and 812, do you? Fitting the oversized tyres on 20's are no more of a band aid than fitting 19's. The car works well with it and it does the job without purchasing new wheels. It is just a different approach compared to what you have done. There's more than one way of doing it and each way has its pros and cons. I'm not wrong, I just recommend a solution that differs from yours Sent from my SM-G930F using FerrariChat.com mobile app
Aside from the weight, the stiffness of the suspension also matters. If the Range Rover and Escalade had as stiff suspension as the FF, the wheels would be more prone to damage.
Ok, but here is the problem with what you're suggesting; Problem #1, a 255 fits like a balloon on a 8.5 inch wheel like the FF front 20 is. You literally are pushing the sidewall over the edge causing sidewall roll and stability issues. Rarely will you find performance tires of 255 accepting 8.5 inch wide wheels, optimal diameter is 9 inches, anything narrower is a compromise, and anything below 8.5 is down right illegal. If you're suggesting Michelin 255 on a 8.5, we know Michelins always run much wide than published numbers, the situation is much worse. The same also applies to the rear, please remember factory rear rims are 10.5, fitting anything larger such as a 305 or even 315 as mentioned somewhere earlier, is just laughable. Those widths require a minimum of 11-11.5 inches. Problem #2, a 40 profile on an FF, a 255 40 20 is approximately 8.3% taller than a 245 35 20, I quote from rimsntire.com "When speedometer reads 60mph (96.6km/h) actual speed will be 65mph (104.7km/h): 8.3% faster." I will sub-divide this into multiple issues' - Issue #1, the ABS system will become over-active. Any hard braking and locking will cause the ABS system to overreact, the computer is expecting 96.6km/k out of the speed sensor, meanwhile the vehicle is travelling at 104.7km/h, not very fun for sporty driving, and not very safe either. - Issue #2, the traction system, same scenario, but opposite effects. The traction system will be activate later, but will overcompensate, its detecting slip at what it perceives to be a slower speed, and a much lower inertial force, the power-cuts will be far more abrupt, and overall driving quality will deteriorate. You are suggesting people run tire sizes on a vehicle that simply shouldn't have them, its a Ferrari, I can accept this on a pickup truck, even an SUV, but installing this on such a calibre of vehicle, where driving dynamics are paramount, is simply unrealistic, and debating it is a futile argument. If you want to keep the 20s the only route I see is custom wheels, similar to the 812 Superfast, 275 35 / 315 35 combo on similar width wheels like the 812 has which are front 10 and rear 11.5 respectively. In this scenario you'll gain some pot-hole protection without completely obliterating traction dynamics, unless of-course someone re-programs the traction system for you.
Michelin approves the fitment of 255/35 section MPS4S on 8.5 inch rims. They also approve the fitment of 305/35 and 315/35 section MPS4S on 10 and 10.5 inch rims. I don't understand how you can label a manufacturer approved fitment as 'laughable' when they have done a lot more testing than you have and they have a much keener eye on their consumer liability than you do. Your assertion that 305 and 315 require a minimum width of 11-11.5 is just plain wrong in this instance.
Pop quiz time; Which rim width is this this 265/35/20 tyre fitted to? Image Unavailable, Please Login Image Unavailable, Please Login And how about the rim width for this 315/30/21 tyre? Image Unavailable, Please Login Image Unavailable, Please Login
I took a bmw 3 series to nyc today- hit a few potholes and iron plates that felt like the front end was gonna come off. No bent wheels. Felt like ****. Gonna try am s class and if that feels like the 3 series im just sticking to my rovers.
According to Aurex, yes. But do you see any ‘sidewalls pushed over the edge’ or tyres like ‘balloons’?
Just because Michelin claims it will fit, means just that. You clearly missed the part about recommended fit. Which Michelin says 9inches for a 255. That being said the rule of thumb is, section width minus 1 inch, for wheel width. For example; a 255 has a section width of 10.2, meaning it'll ideally fit on a 9 inch rim. A 315 tire has a section width of 12.6, and optimally fits on a 11.5 inch wheel, and this is EXACTLY how Ferrari uses tire sizes on its wheels. The 812 Superfast runs a 275 on a 10 and a 315 on an 11.5. Why do you ask? because they do what is optimal; not what tire sizes were available at the local "tire center" back in 1990, that you had to fit on your Honda Civic. Ballooned sidewalls drive like garbage, and people that do it, do it in poor taste. Michelin states it'll fit, but the best you'll get out of the tire is lateral traction, you certainly won't get good handling dynamics. Its just fact, but do as you please.
I found this article very educational. Tread width rather than section width should be the focus. And 'optimal' is a range, not a single point. Unless you're a race car driver or tyre engineer, I'd rather take Billy Johnson's word than yours. No offence, it's just fact https://motoiq.com/how-to-properly-select-and-size-tires-for-performance/
Lovely article which I fully agree with; here are some quotes incase you missed them; "In our example, the factory 285 is pretty good but isn’t optimal for our 10” wheel, and it could make even more grip and have better response on a 10.5” wheel. If you were to downsize the tire on the factory 10” wheel, you are optimizing the grip and response of a smaller tire, but that may be a slight net loss of grip for a slight improvement of response. " "Pick the best tire in the outer diameter and section width that will fit the room or rules, and then size the wheel accordingly." "Here’s a Top Tip: “Tires are the most important. A narrower, but better (compound, construction, tread design, etc…) tire will, to a point, generally outperform a wider, inferior tire”.." I agree, section widths aren't optimal to take into consideration, as they are based on mounting the tire on the RECOMMENDED wheel width, but that's once again exactly the point. Buying tires that are recommended for your wheel widths. So once again, a 315 on a 10.5, in most circumstances is laughable, especially a Michelin MPS4 which runs wide, and you're article proves it, and even Billy agrees; "“For ideal handling: when sizing a tire for a given wheel, I usually target a tire’s TREAD width to be as wide as the WHEEL width, or 0.5” narrower than the wheel width.”" So who ever Billy is, he suggests a 11.5 wide wheel for a 315. If Billy is who you need to read it from as fact, vs. Ferrari engineers than so be it; but you have to admit its ironic they both agree on the same thing.
Why is it laughable? The 315/30/21 in the photo I posted has a measured tread width of 10.9" on an 11" reference rim. The tyre is mounted on a 10.5" rim which reduces the tread to 10.7". That's close enough to Billy's rule of thumb and far away from laughable. And in case you think the hallowed Ferrari engineers won't oversize a tyre then let's take a look at the 245/35/20 stock tyres and rims. The MPS4S K1 has a measured tread width of 8.7" and it's specified for a 8.5" rim. So who's laughing now?
