Question on 19 x 9.5 tire fitment

[NicksGTR]

I've seen alot of aftermarket applications, mostly from American Muscle, calling for a 275 40 19 on a 9.5 front and 285 35 19 on a 10.5. Why wouldn't they suggest a 265 35 19 of the same aspect ratio for the front?

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[NightmareMoon]

265/35 is about 10mm too narrow for a 9.5 wheel (which is not the end of the world or anything) and also 8 or 9% too short. small.

275/35 (or 275/40) is a correct diameters and 275 is the typical width for a 9.5” wheel. A 265/40 would be fine, but possibly not a very common tire size?

keep in mind the XXX/YYRZZ number, the YY sideqall number is a percentage of the XXX tire width, so a 265/35 is shorter than a 275/35 even tho the YY sidewall number is the same, the sidewall and thus overall tire diameter on the 265/35 is shorter than the sidewall and diameter on the 275/35

 

[Dave2013M3]

265/35 is about 10mm too narrow for a 9.5 wheel (which is not the end of the world or anything) and also 8 or 9% too short. small.

275/35 (or 275/40) is a correct diameters and 275 is the typical width for a 9.5” wheel. A 265/40 would be fine, but possibly not a very common tire size?

keep in mind the XXX/YYRZZ number, the YY sideqall number is a percentage of the XXX tire width, so a 265/35 is shorter than a 275/35 even tho the YY sidewall number is the same, the sidewall and thus overall tire diameter on the 265/35 is shorter than the sidewall and diameter on the 275/35

A 265 width tire is fine for a 9.5" width wheel. In fact BMW E92 M3's came with a 265/35/19 tire on a 9.5" wheel stock and a 10" wheel with the ZCP package (Competition). In fact Michelin recommends a 9-10.5" wheel width for a 265/35/19.

To the OP I would have an issue with those sizes as the front and rear difference in tire diameters is huge. A 265/35/19 is 26.3" tall a 275/40/19 is over 27.7" that will throw off the stability control in a big way.

 

[NicksGTR]

A 265 width tire is fine for a 9.5" width wheel. In fact BMW E92 M3's came with a 265/35/19 tire on a 9.5" wheel stock and a 10" wheel with the ZCP package (Competition). In fact Michelin recommends a 9-10.5" wheel width for a 265/35/19.

To the OP I would have an issue with those sizes as the front and rear difference in tire diameters is huge. A 265/35/19 is 26.3" tall a 275/40/19 is over 27.7" that will throw off the stability control in a big way.

That's what I figured, but AM has that 275 listed in their staggered tire set up?

 

[Idaho2018GTPremium]

I've seen alot of aftermarket applications, mostly from American Muscle, calling for a 275 40 19 on a 9.5 front and 285 35 19 on a 10.5. Why wouldn't they suggest a 265 35 19 of the same aspect ratio for the front?

Do not go 275/40/19 in the front and 285/35/19 in the rear. The front tires will be 1" taller than the rears, and will look silly. The stock GT PP1 front tire is a 255/40 on a 9" wide wheel and the rear is 275/40/19 on 9.5" wide wheel. You can put 255/40 on a 9.5" wheel. 295/35/19 in the rear (if available) would match better with a 255/40 or 265/40 on the front. If you go 285/35 in the rear, don't go more than 255/40 in the front.

 

[NightmareMoon]

its not about the width, its the diameter. A 265/35 is 26.3" tall and a bit small in diameter for the car... the stock front wheels 255/40 are 27.1 which is almost an inch taller. Sure you can run a 265 on a 9.5" wheel, but you probably also want to get the diameter in the ballpark.

That's why 275 sizes are more common. Can you run a 265/35? probably ya, but your wheel gap will be significant and it will look small in the wheel well. A 265/40 is a better diameter, or a 275/35.

 

[FreePenguin]

I have 19x9.5 all around, with 285/35/19 on them. I don't see why it wouldn't fit. but the tires I have are Michelin dsw6

 

[NicksGTR]

Thanks for all the feedback. One caveat, I'll be running Steeda lowering springs.

 

[sredish]

265/40R19 & 295/35R19

Wanted to go with 275 up front but needed tires quickly and all they had. 275/35R19 up next.

 

[Chef jpd]

275/40/19 on 19x10 offset 35 square is PERFECT.

 

[spaz mk will]

275/40/19 on 19x10 offset 35 square is PERFECT.

Maybe. 275/40 is kinda tall for the front. Depends on how low OP is up front or how much they like sidewall. My lowered S197 friend has 275/40 square on 19x9.5 and it’s fine, he likes it because it’s a cheap size with good selection. It’s mostly preference.

I’m inclined to stick closer to the 27 inch diameter or less all around. A smaller rear diameter also gives a slight gearing advantage, where the 2018+ MT cars need all they can get.

For OP, here is a helpful site. https://tiresize.com/calculator/

 

[FreePenguin]

Thanks for all the feedback. One caveat, I'll be running Steeda lowering springs.

I am too

 

[shogun32]

255/40 on 9.5 is also perfectly suitable and since you have an Ecoboost just peachy as well.

 

[Idaho2018GTPremium]

265/40R19 & 295/35R19

Wanted to go with 275 up front but needed tires quickly and all they had. 275/35R19 up next.

I don't know if it's the angle of this photo or what, but your front tires look like 18" with a really tall sidewall.

For the OP: another thing to keep in mind is a tall front tire raises the center of gravity of the heavy front end, affecting handling somewhat. So it's sort of a double whammy, taller profile (less responsive handling)+higher center of gravity.

 

[NicksGTR]

Maybe. 275/40 is kinda tall for the front. Depends on how low OP is up front or how much they like sidewall. My lowered S197 friend has 275/40 square on 19x9.5 and it’s fine, he likes it because it’s a cheap size with good selection. It’s mostly preference.

I’m inclined to stick closer to the 27 inch diameter or less all around. A smaller rear diameter also gives a slight gearing advantage, where the 2018+ MT cars need all they can get.

For OP, here is a helpful site. https://tiresize.com/calculator/

That tire size calculator is great, especially the 2 tire comparison. I'm leaning towards 275 35 19 for the front. Thanks

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