It seems like a lot of people don’t understand tire and rim relationships.

[Dinokill3.7]

More often than not, I see people recommending getting wider tires when someone ask for fitment and/or grip recommendations.

Getting just wider tires while not changing the rim’s width won’t do much

for example, I saw a guy that had 325 tires on a stock 9.5 inch PP rim.

The contact patch will pretty much be the same if you get wider tires and leave the rims alone.

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[JetGray_Mach1]

Yep plus you run into safety issue, tire could pop out in sharp turn in addition the car gets really floaty when side wall bulges out like that.

 

[Bluemustang]

More often than not, I see people recommending getting wider tires when someone ask for fitment and/or grip recommendations.

Getting just wider tires while not changing the rim’s width won’t do much

for example, I saw a guy that had 325 tires on a stock 9.5 inch PP rim.

The contact patch will pretty much be the same if you get wider tires and leave the rims alone.

The contact patch will pretty much stay the same regardless. Only the shape changes. It's based on mass and tire pressure. If you go wider, you need to decrease pressure to widen the contact patch.

 

[HKusp]

You can sum a lot of things up with; "People are stupid." It applies in many situations.

 

[Bobby57]

More often than not, I see people recommending getting wider tires when someone ask for fitment and/or grip recommendations.

Getting just wider tires while not changing the rim’s width won’t do much

for example, I saw a guy that had 325 tires on a stock 9.5 inch PP rim.

The contact patch will pretty much be the same if you get wider tires and leave the rims alone.

This is a great reference : https://www.wheel-size.com/calc/

Rim width (inch)	Min. tire width (mm)	Ideal tire width (mm)	Max. tire width (mm)
5,0	155	165 or 175	185
5,5	165	175 or 185	195
6,0	175	185 or 195	205
6,5	185	195 or 205	215
7,0	195	205 or 215	225
7,5	205	215 or 225	235
8,0	215	225 or 235	245
8,5	225	235 or 245	255
9,0	235	245 or 255	265
9,5	245	255 or 265	275
10,0	255	265 or 275	285
10,5	265	275 or 285	295
11,0	275	285 or 295	305
11,5	285	295 or 305	315
12,0	295	305 or 315	325
12,5	305	315 or 325	335

 

[ing3nious]

Hmmm 10.5” with a max of 295. Guess the ford engineers didn’t get the memo or threw it out for the PP2 or Mach1.

 

[Johnny Rockit]

50% are stupid and the other 50% don't know it .

 

[MLO 351]

From what I've read, tread width is the key metric, ideally tyres that are 1/2 an inch under the rim width, provides for the best handling option with up to 1/2 an inch over rim width being acceptable.

 

[shogun32]

Hmmm 10.5” with a max of 295. Guess the ford engineers didn’t get the memo or threw it out for the PP2 or Mach1.

Ford was going for style points and bragging in literature. That said 305 does fit and survives heavy track use.

In all matters of engineering except bridge building there are fudge factors.

Plus a 295 tire isn't remotely 295 across. That is why tirerack measures every damn tire using a consistent methodology.

 

[HKusp]

50% are stupid and the other 50% don't know it .

The 50% that don't know it are the REALLY dangerous ones. Seems like a lot of them go into politics.

 

[Bob Lob Law]

Tires are also allowed up to a 10% difference in actual size compared to indicated size. Some manufacturers are more true to size than others.

 

[PhillyMike]

Also depends on tire manufacturer. Specs on on their website for allowable wheel width vs tire width. Not all 255's are the same.

 

[WItoTX]

Hmmm 10.5” with a max of 295. Guess the ford engineers didn’t get the memo or threw it out for the PP2 or Mach1.

Ford designs the car to meet a whole host of requirements, not solely performance. More sidewall = more comfortable ride. Because most people buying mustangs will only drive them to and from work.

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