Any Tire Wizards out their??

[Captian_Eddie]

We all know that the 2020 GT350 comes with hard to find tire sizes unless you want to run Cup2s or Pirellis I want to get some Toyo R888Rs but they do not come in a 35 bias. only 30s My question is has anyone got 295/30/10 on the fronts and 305/30/19 on the back. Any problem with running the smaller Bias tires?
TIA Ed

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[THX 138]

I run 30-series Michelin Pilot Sport 4S tires in stock widths, 295/30R19 front and 305/30R19 rear, and love them. The speedometer and odometer will be off, but that is easily corrected with ForScan (GPS verified to be accurate now on my car). The shorter tires effectively reduce the rear end gear ratio from 3.73 to 3.90. Quicker acceleration, just reduced top speed in each gear. FWIW, the R models come with 30-series tires from the factory.

 

[TopJimmyCooks]

You should be able to calibrate the speedo for the new tire diameter with a cal tool like ProCal or (I think) Forscan. I don’t have Forscan, others will certainly chime in.

 

[lunatect]

Or you can order the OEM Michelins from Discount Tire like I did. it just takes a couple months to get them. lol

 

[guzie]

You should be able to calibrate the speedo for the new tire diameter with a cal tool like ProCal or (I think) Forscan. I don’t have Forscan, others will certainly chime in.

Only forscan as you have to modify the as built table value for it in the body control module. I found it impossible to change through my tuner.

 

[guzie]

We all know that the 2020 GT350 comes with hard to find tire sizes unless you want to run Cup2s or Pirellis I want to get some Toyo R888Rs but they do not come in a 35 bias. only 30s My question is has anyone got 295/30/10 on the fronts and 305/30/19 on the back. Any problem with running the smaller Bias tires?
TIA Ed

Toyo R888R are a great tire by the way. I ran 305/30R19 square setup on my track wheels.

 

[Hawkeye1]

Only forscan as you have to modify the as built table value for it in the body control module. I found it impossible to change through my tuner.

I just did it yesterday with Forscan. It was relatively easy. The setting is in the Body Control Module, and is based on the tire circumference in mm.

 

[Kramerica]

Toyo R888R are a great tire by the way. I ran 305/30R19 square setup on my track wheels.

I'm running these as well and they are a great track tire. If you plan to run them on the street just be prepared because they are LOUD. Much more noise from these in comparison to Michelin SC2 or SS.

 

[P85596]

I'm running Michelin Pilot 4S 305/30r/20 on all four corners and I can't tell any difference in ride other than the tramlining has all but disappeared. Before I mounted them I did an eyeball comparison with the 19's while they were on the car and the size was almost identical so I'm guessing speedo error is at a minimum.

 

[guzie]

I just did it yesterday with Forscan. It was relatively easy. The setting is in the Body Control Module, and is based on the tire circumference in mm.

Yep. There is a good thread on it. It’s not as daunting and scary as it sounds

 

[guzie]

I'm running these as well and they are a great track tire. If you plan to run them on the street just be prepared because they are LOUD. Much more noise from these in comparison to Michelin SC2 or SS.

Agreed. I ran them first as a street/track tire for a few months until I got a second set of wheels for just track use.

 

[dboz1983]

FWIW, I just got Pilot Super Sports in OE GT350 sizes, front and back, from Tire Rack. Ordered a week ago, they delivered to my door yesterday.

 

[guzie]

FWIW, I just got Pilot Super Sports in OE GT350 sizes, front and back, from Tire Rack. Ordered a week ago, they delivered to my door yesterday.

Those are ok but not as sticky

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