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I have had a look on the forum but couldn't find anything. Is anyone running a larger tyre package on the 20" wheels? Is it possible? I was looking at maybe going up to a 305 on the rear and a 255/265 front, want to run track day tyres on a second set of wheels. Apex VS-5RS.
This is the bible of tire size fit for a GT4. https://apexwheels.com/fitment-guide...-fitment-guide
I expect it would be similar for any 718 except that it may be even harder to get the camber settings and clearances needed without starting with the somewhat adjustable GT suspension components. You'll see that to fit the sizes you're talking about, even a GT4 needs quite a few upgrades like toe links and camber plates. 265/305 is significantly wider than OEM and definitely won't just fit without changing things.
I have had a look on the forum but couldn't find anything. Is anyone running a larger tyre package on the 20" wheels? Is it possible? I was looking at maybe going up to a 305 on the rear and a 255/265 front, want to run track day tyres on a second set of wheels. Apex VS-5RS.
All help appreciated.
I think a 255/35/20 on the front is an easy fit, and actually may even be a better match to the stock 295 rear. You can fit 305s on the rear, but depending on the tire, it may rub with the OEM wheel offset. I don't know the exact fitment specs on the Apex wheels you are thinking about.
I think a 255/35/20 on the front is an easy fit, and actually may even be a better match to the stock 295 rear. You can fit 305s on the rear, but depending on the tire, it may rub with the OEM wheel offset. I don't know the exact fitment specs on the Apex wheels you are thinking about.
This was the fitment i was looking at
Front Wheel Size: 20x9" ET50
Rear Wheel Size: 20x11" ET50
Have you tried these sizes yourself? I was also wondering would the 255 be a nice front upgrade. I am looking at running maybe nankang CR-s or Super trof
Looks like the Nankangs run wider to start, so be careful. With camber plates 265/30R20 or 255s on 20s should be fine. I wouldn't run 265/35R20 though, too tall.
I have had a look on the forum but couldn't find anything. Is anyone running a larger tyre package on the 20" wheels? Is it possible? I was looking at maybe going up to a 305 on the rear and a 255/265 front, want to run track day tyres on a second set of wheels. Apex VS-5RS.
Had a read, nothing mega clear but a few hints. I might try AD09 in the stock size for the moment. I really wanted to move more to an R compound though. don't know if a 255/35/20 and a 305/30/20 will fit without arms and plates.
Had a read, nothing mega clear but a few hints. I might try AD09 in the stock size for the moment. I really wanted to move more to an R compound though. don't know if a 255/35/20 and a 305/30/20 will fit without arms and plates.
I'm in the same boat as you. Looking to switch to new dedicated track wheels, leaning towards 19's, but prefer 20's... maybe could pull off the best of both worlds and do 19" F - 20" R...? The other threads, while useful in some ways, end up getting diluted with info non-related to the topic. What I have gathered from the other threads is that most tire sizes greater than OEM specs "might" require F Camber Plates, R Toe Links to ensure there's no rubbing; with some tires like SC3's having a slightly wider footprint in the same sizing as others in its class. With that said, I think its best you go down the route of installing Plates/Link, if not, you would be crossing your fingers after you get them fitted, and may further limit your future tire selection. This would hold true for OEM or Aftermarket wheels with beefier rubber.
Your greatest concern would be in the front. Have you taken a look at 255-265 F in 30/20 sizing? This would allow for more clearance in the F.
I just ordered a set of new wheels with 20X9 +44 up front. BC Forged is recommending using the oem size tire. I'm going to stop by the Indy shop that is going to mount them today and discuss sizing with a more aggressive alignment and if shimming/plates/suspension mods would help. I'll post what I find out.
I'm in the same boat as you. Looking to switch to new dedicated track wheels, leaning towards 19's, but prefer 20's... maybe could pull off the best of both worlds and do 19" F - 20" R...? The other threads, while useful in some ways, end up getting diluted with info non-related to the topic. What I have gathered from the other threads is that most tire sizes greater than OEM specs "might" require F Camber Plates, R Toe Links to ensure there's no rubbing; with some tires like SC3's having a slightly wider footprint in the same sizing as others in its class. With that said, I think its best you go down the route of installing Plates/Link, if not, you would be crossing your fingers after you get them fitted, and may further limit your future tire selection. This would hold true for OEM or Aftermarket wheels with beefier rubber.
Your greatest concern would be in the front. Have you taken a look at 255-265 F in 30/20 sizing? This would allow for more clearance in the F.
Yeah problem with this car is it has PCCB's so stuck with 20".
I think it will be stock sizes then we will do chamber plates and rear toe rods to fit the 255/305 combo I think
Yeah problem with this car is it has PCCB's so stuck with 20".
I think it will be stock sizes then we will do chamber plates and rear toe rods to fit the 255/305 combo I think
255 seems right for OEM's. Im always baffled when I see others go 20MM on the Fronts and only 10MM on the Rears. I have never stretched a tire more than 10MM over OEM sizing on either F/R. There has to be an oversteer/understeer application for the the added 20MM = 265F
255 seems right for OEM's. Im always baffled when I see others go 20MM on the Fronts and only 10MM on the Rears. I have never stretched a tire more than 10MM over OEM sizing on either F/R. There has to be an oversteer/understeer application for the the added 120MM = 265F
Yeah, I am going to see what R compounds I can find for the stock sizes. But I think this will limit it initially.
The car is imbalanced from the factory on purpose to have understeer dialed in from the get go. The front tires and wheels are smaller than they could have been. They kept the same fronts on the 4RS too?? Watch Misha's review of the 4RS when he says the front end or suspension is Mewh. Simple upgrade are 255/35-20 front tires, which should have at least been OEM on the 4RS with 9 inch front wheels. With that setup though, the car would have come dangerously close to the GT3's Ring time.
Most if the guys at my track are upgrading to these on the front now. I did it from day on my 4RS with Cup 2s. Sold the OEM Dunlaps to a friend. Car still lost its front end as the front tires wore out prematurely. May have something to do with the fact they were a Ferrari spec for the 255. The Michelins had a 240 wear rating on their 255s so a different compound as compared to the other Cup 2s. The 255 are also the same ride height as the rears, so no issues with PSM.
255/35-20 will fit on the front with no problems, been there done that. Leave the rears alone at 295. The car needs more grip in the front.
265/35-20 not such a good idea for the faint of heart. You will need camber plates of course, a 9 inch rim, matching 305s in the rear for the correct balance, careful adjustment of the caster, modifications to the wheel liners, modification to the rubber brake duct, stronger front thrust arms as they are known to fail with the grip of the 265 tires, caster pucks if for a regular GT4, adjustments to ride height, and the tires will rub on the fender liners at greater than 360 degrees of steering lock.
Why +20 mm front and only +10 mm in the rear. That rebalances the car to reduce understeer and give you more front end grip. So just add +10 mm to the front or do both axels at the +10/20 mm.
Yes the 265 Nankang are huge tires and there are fitment issues but they can be overcome. Front end grip with them on 9.5 inch front rims is just insane for this car though. Feels almost like going from a 991 to a 992 GT3. They are only .1 inch taller than the 305 rears so they are very very close in height.
265/305-20 setup with stiffer 110 Nm front springs, plates, etc, etc. It can all fit.
Last edited by lovetoturn; 04-05-2024 at 12:35 AM.
The car is imbalanced from the factory on purpose to have understeer dialed in from the get go. The front tires and wheels are smaller than they could have been. They kept the same fronts on the 4RS too?? Watch Misha's review of the 4RS when he says the front end or suspension is Mewh. Simple upgrade are 255/35-20 front tires, which should have at least been OEM on the 4RS with 9 inch front wheels. With that setup though, the car would have come dangerously close to the GT3's Ring time.
Most if the guys at my track are upgrading to these on the front now. I did it from day on my 4RS with Cup 2s. Sold the OEM Dunlaps to a friend. Car still lost its front end as the front tires wore out prematurely. May have something to do with the fact they were a Ferrari spec for the 255. The Michelins had a 240 wear rating on their 255s so a different compound as compared to the other Cup 2s. The 255 are also the same ride height as the rears, so no issues with PSM.
255/35-20 will fit on the front with no problems, been there done that. Leave the rears alone at 295. The car needs more grip in the front.
265/35-20 not such a good idea for the faint of heart. You will need camber plates of course, a 9 inch rim, matching 305s in the rear for the correct balance, careful adjustment of the caster, modifications to the wheel liners, modification to the rubber brake duct, stronger front thrust arms as they are known to fail with the grip of the 265 tires, caster pucks if for a regular GT4, adjustments to ride height, and the tires will rub on the fender liners at greater than 360 degrees of steering lock.
Why +20 mm front and only +10 mm in the rear. That rebalances the car to reduce understeer and give you more front end grip. So just add +10 mm to the front or do both axels at the +10/20 mm.
Yes the 265 Nankang are huge tires and there are fitment issues but they can be overcome. Front end grip with them on 9.5 inch front rims is just insane for this car though. Feels almost like going from a 991 to a 992 GT3. They are only .1 inch taller than the 305 rears so they are very very close in height.
265/305-20 setup with stiffer 110 Nm front springs, plates, etc, etc. It can all fit.
Mega answer cheers that was exactly what I was looking for. Do you know what the spring rates that BBI and Emotion run for only spring changes? Car look mega BTW
04-02-2024, 10:05 AM
718 GT4 Tyre upgrade 20"
