Novitec Nf2 for a 456 gt

Thanks Taz, yes I thought they were too high at about 36-38. Seemed to lose adhesion too easily.
w

 

You were just riding on the center patches at those pressures. May take a little fiddling to get them perfect. That is what the factory did with OEM tires. Trial and error.

 

Michelin recommends front 29 psi and rear at 26 psi. That's what I am using on mine and works great.

 

Mel, Thanks I couldn't find anything official. 29 and 26 seems very low. Even at 32 I get wear marks well down the shoulder. I'll try it based on your good experience.
w

 

Mel- Michelin has a recommendation for their tires on NF2s on a 456?

Ferrari recommends tire pressures based on empirical test data on each car/tire combination.

 

Just a general Michelin recommendation for those tire sizes. I believe they base those low pressures on the heat the larger tires would generate.

 

I run 32 front and rear on my 2002 456M GT with NF2's. MPPS 255/35/19 (96Y) & 345/30ZR19 (109Y)

 

Same thing I ran on my 575M when I had NF2s.

 

My tires were quickly worn on the outsides with original spec pressure. The ture shop guys say 30-32 is too low. They say all the way up to 40 is right. Difficult to know who to trust. A multimillion car company or a proper tire expert who base their words out of the experience of seeing hundreds of tires being worn uneavenly.... when going from 30-40 psi the ride is another world. Rolls much easier, but with much less comfort!

 

Erik- That is also caused by hard cornering. See that myself. Higher pressures will not fix that, but will beat up your (not the 550's) rear and suspension components.

 

Hi Taz / All.
Very new to all this and know my aircooled P-cars. This is totally new for me.
With my C4 as long as the rolling radius is within 4% of f>rear wheels, providing it fits anything goes.
With regards to the electronics on 456s am I correct in understanding that I need to calculate the stock rolling radius from the oem tyre size ( using something like will they fit.com ) then calculate my tyre sizes / rim width to be 5% of this oem figure?
.... I have some rial 19” Daytona’s Race 2 piece wheels that I’d like to relip on my future car.
.... would it be fair to suggest it doesn’t matter what the lip size is etc ( providing they fit ) as long as the final rolling radius is within 5% of the oem rolling radius size ?
+ is there a tolerance to in which the front to rear wheels need to be in overall rolling radius? Ie they must be within x%.

Forgive me for being new to all this, however interested in your response.
Thx all. Giles

 

The only thing ABS cares about is the difference in diameter/radius/circumference (same ratio whatever you use, diameter easiest) front to rear. More than about 5% different from OEM ratio, and the ABS ECU gets unhappy.

 

I have a set of Gloss Black Novitec NF2 for sale in Ferrari parts forum. 19" f and 20" rear. Also have a set of silver 19" rears only, NF 2's. Novitec spacers for the rear are included.

 

in Fact this my car with asanti wheels LOL

 

Interesting. Did you take the photo or was it a previous owner?

 

I have 1995 456GT with 25mm type two spacers on the rear.

Just bought set of NF2s. 9Jx19H2 fronts and 12.5Jx19H2 rears.

I think I read a post where a good combo to get the same front/rear diameter is 255/35/19 front and 345/35/19 rear.

Is that correct or is there a better tire size setup? I see a lot of different height combos mentioned. Hard to know what is best.

Thanks,

Ken

 

I would avoid 35 profile in rears..too tall

I made a thread on this very topic about a year ago; the original size is NLA but there is a close enough still available:

• 345/30-19
• Original was 355/25-19 FWIW

 

Thanks for the help. So fronts are good at 255/35/19 and 35/30 difference front to rear will not mess up the ABS?

 

Misunderstood the aspect. They are really close in size. Thanks

 

Anyone know what year/make/model lists the 345/30/19 as stock? Cannot get any online retailer to sell them to me without that.

Thanks.

 

None, most likely. Closest would be a Viper. 2016 used 355/30 19 rears.

 

So how do people manage to buy them? Costco/Discount/Tire Rack all require vehicle info to purchase.

Ebay I guess...

 

I’m traveling so the above sizes were from memory. If 345 now nla (if so, that would be strange because I could’ve swore Michelin and continental both make tires in that size) then agree 355/30 next best.

on most of the websites you can select EITHER by size or model….

Also, if you’re going to 355/30, personally, I would favor 265 fronts for better balance but each his own

 

It is not that they do not have them, they do. It is that most of the online websites MAKE you enter a vehicle, and if "IT DOES NOT FIT" they do not let you check out. Instead you need to purchase one of the approved tire sizes. Costco has been doing this for a while now but it seems the lawyers are getting their grubby hands on everything now.

UGH!!!