Rear tire size

[Andy Feuer]

Velgen VF5 with Nitto NT555 tires: 275/35/20 front (20x10), 305/30/20 rear (20x11).
The rear tires stick out ever so slightly. Does it get stuff on the rear panel? Sure does. Do I regret doing this? Not for a second.
The 305/30/20 are essentially identical to the stock tire size, so speedometer isn't an issue at all. If you go with 35's you will be off a 3-4 MPH at 65 MPH (and off more at higher speeds) unless you get the computer updated.

Does your cruise still work with that setup?

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[MattScopes]

From Alibaba

It never occurred to me to check Alibaba for wheels. Just checked and these prices seem crazy, I’m intrigued. $250-300 for each forged wheel?!?! Are you in the US? How much were the wheels you settled on? How much were tarrif/import duties? Were yours listed as forged? And are they?

 

[A.alansari]

It never occurred to me to check Alibaba for wheels. Just checked and these prices seem crazy, I’m intrigued. $250-300 for forged?!?! Are you in the US? How much were the wheels you settled on? How much were tarrif/import duties? Were yours listed as forged? And are they?

the price depends on what you will order
And yes they are forged
I don't live in the US it costs 1770$ to the door including shipping and they send a lower price Invoice when they ship so you don't have to pay more for taxes

I received the wheels a week or so ago but still waiting on the caps should arrive this week hopefully

 

[A.alansari]

Update: regarding the cruise control still working without problems

i went with
Front 275/35/r20
Rear 325/30/r20

 

[exm]

Update: regarding the cruise control still working without problems

i went with
Front 275/35/r20
Rear 325/30/r20

It's a very easy Forscan fix to update the tire diameter.

 

[A.alansari]

It's a very easy Forscan fix to update the tire diameter.

the problem is the adaptive cruise control stops working when you change the tire size something to do with the radar angle

 

[Andy Feuer]

the problem is the adaptive cruise control stops working when you change the tire size something to do with the radar angle

My adaptive still works with 275/35/20 and 305/35/20

 

[Sofa King]

the problem is the adaptive cruise control stops working when you change the tire size something to do with the radar angle

I still don't think that is the issue... easy way to find out, just change the angle of the radar sensor...

My adaptive still works with 275/35/20 and 305/35/20

I too have had no issues with similar sizes. Though I did change tire size (rev per mile) in the PCM so speedometer would be correct.

 

[Andy Feuer]

I still don't think that is the issue... easy way to find out, just change the angle of the radar sensor...



I too have had no issues with similar sizes. Though I did change tire size (rev per mile) in the PCM so speedometer would be correct.

I didn't have them change anything in the PCM and it works perfect (at least with the size I went with.

 

[Ken H.]

Update on my 20” wheel/tire change & loss of pre-collision assist (PCA) & cruise control (CC) on my 2024 DH/HP.
quick recap: changed to Michelin PS4 all season 285/35/20 front 1.6” taller, 305/35/20 rear 1.9” taller>lost PCA/CC>couldn’t recalibrate>Ford said d/t altered camera angle>back to stock 19” Trofeos> recalibrated >changed 285/30/20 front 0.2” taller, same 305/35/20 rear 1.9” taller> lost PCA/CC.
Someone suggested I put the stock 19” ones on the back with the 0.2” taller 20” on front & see if it would recalibrate. IT DID! Great tip!
So, I’ll put the front stock 19” ones, run them until it gets cold & put all seasons on with new rear 20s that match the stock diameter. Probably will have to go to 295s. I don’t know how others are getting away with 315, 325/20 rears & not losing PCA/CC. Doesn’t compute. Thanks for putting up with my whining & for all the suggestions.

 

[A.alansari]

Update on my 20” wheel/tire change & loss of pre-collision assist (PCA) & cruise control (CC) on my 2024 DH/HP.
quick recap: changed to Michelin PS4 all season 285/35/20 front 1.6” taller, 305/35/20 rear 1.9” taller>lost PCA/CC>couldn’t recalibrate>Ford said d/t altered camera angle>back to stock 19” Trofeos> recalibrated >changed 285/30/20 front 0.2” taller, same 305/35/20 rear 1.9” taller> lost PCA/CC.
Someone suggested I put the stock 19” ones on the back with the 0.2” taller 20” on front & see if it would recalibrate. IT DID! Great tip!
So, I’ll put the front stock 19” ones, run them until it gets cold & put all seasons on with new rear 20s that match the stock diameter. Probably will have to go to 295s. I don’t know how others are getting away with 315, 325/20 rears & not losing PCA/CC. Doesn’t compute. Thanks for putting up with my whining & for all the suggestions.

The gt performance package rear is 27.7" diameter 275-40-19

The 325-30-20 is the same exact diameter 27.7"
For the front i went with 275-35-20 its .6" bigger

 

[86pagt]

Active Cruise on mine with 285 35 and 325 30s and use it every time I drive it to work

 

[Sofa King]

Update on my 20” wheel/tire change & loss of pre-collision assist (PCA) & cruise control (CC) on my 2024 DH/HP.
quick recap: changed to Michelin PS4 all season 285/35/20 front 1.6” taller, 305/35/20 rear 1.9” taller>lost PCA/CC>couldn’t recalibrate>Ford said d/t altered camera angle>back to stock 19” Trofeos> recalibrated >changed 285/30/20 front 0.2” taller, same 305/35/20 rear 1.9” taller> lost PCA/CC.
Someone suggested I put the stock 19” ones on the back with the 0.2” taller 20” on front & see if it would recalibrate. IT DID! Great tip!
So, I’ll put the front stock 19” ones, run them until it gets cold & put all seasons on with new rear 20s that match the stock diameter. Probably will have to go to 295s. I don’t know how others are getting away with 315, 325/20 rears & not losing PCA/CC. Doesn’t compute. Thanks for putting up with my whining & for all the suggestions.

The difference in diameter is much greater than what is configured in the PCM... DH HP comes configured for a much smaller tire than a GT PP... more than an inch. You need to stay close to that size or reconfigure the tire size in the PCM.

 

[Sofa King]

the problem is the adaptive cruise control stops working when you change the tire size something to do with the radar angle

I don't think that is it... stock cars with square setup have same size tires front and rear (no angle)... yet the GT PP has much taller rear tires (0.7") and no problem with radar angle. My car is 0.8" difference, no problem.

Has anyone with this "bad angle" issue actually tried setting the proper rear tire size in the PCM? That is the more likely issue...

 

[Ken H.]

The difference in diameter is much greater than what is configured in the PCM... DH HP comes configured for a much smaller tire than a GT PP... more than an inch. You need to stay close to that size or reconfigure the tire size in the PCM.

True. My HP Trofeo 19s are smaller diameter than GT cars. I think that’s why the GT cars can run 315 & 325/35/20s without a problem. I haven’t looked at the diameters of the stock GT cars; just my guess. Because of the smaller DHHP Trofeos, I think I’m going to be limited to 295/XX/20s in the Michelin PS4 AS line. I remember seeing one that matched up. With all the hassle, I will definitely be staying close to the stock diameter.

The difference in diameter is much greater than what is configured in the PCM... DH HP comes configured for a much smaller tire than a GT PP... more than an inch. You need to stay close to that size or reconfigure the tire size in the PCM.

The difference in diameter is much greater than what is configured in the PCM... DH HP comes configured for a much smaller tire than a GT PP... more than an inch. You need to stay close to that size or reconfigure the tire size in the PCM.

True dat. I think that’s why the GTs are getting away with 315 & 325/20s without cruise control & pre-collision assist problems. I haven’t looked at the actual #’s; just my guess.
With all the hassle, I’ll be staying close to stock diameter when I go back to All Seasons. Probably limited to 295/XX/20s in the Michelin PS4 AS line if I remember correctly.

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