Tire size mistake. Please help.

4door65guy · 09-22-2019, 06:33 PM

I'm just going to acknowledge right off the bat that I made a decision without thinking about it and I therefore admit I am an idiot

. Today I put new tires on my Camaro. I bought Michelin Ps4s due to all the awesome reviews on here. the shop I bought them from had the 275/35/r20s but not the front 245s and since they had to order them and they were actually cheaper i had them get me 255s (not giving thought to the increase in sidewall height). Now that I have them installed and drove around all day I noticed that the front sidewalls are much bigger then the rear 275s and it looks a bit goofy. So my question is, is this going to effect the handling performance/stability controll/ABS negatively? If so ill have to just order the stock size tires and sell these on craigslist or something because better handling was the whole point of these tires. I can live with the look even though its kinda off but not hampered handling/safety. Thanks for the help in advance guys.

*Joshinator99* · 09-22-2019, 06:53 PM

So what size tires did you actually order for the front? 255/40/20? Or 255/35/20?

4door65guy · 09-22-2019, 06:57 PM

255/40/20 I probably would have been perfect if i got 255/35/20s but I just wasn't thinking about the sidewall height. and honestly didn't realize how much of a change it would have just one size up.

*Joshinator99* · 09-22-2019, 07:13 PM

Quote:

Originally Posted by 4door65guy

255/40/20 I probably would have been perfect if i got 255/35/20s but I just wasn't thinking about the sidewall height. and honestly didn't realize how much of a change it would have just one size up.

I believe you are 4mm taller than stock front overall with the 255, so 2mm on the sidewall all the way around. I'm not a tire expert, but that doesn't sound like a dealbreaker. If you had ordered 255/35 you would have been over 8mm smaller than stock front size, not sure if that would have been an issue. Hopefully someone with more knowledge on this will chime in.

4door65guy · 09-22-2019, 07:18 PM

yeah i'm thinking its probably ok too I just don't know. I appreciate you chiming in and trying to help me out.

MrChrisLS3 · 09-23-2019, 07:35 AM

The issue you might run into is with the fronts being taller, the wheel speed sensors will think the rears are rotating faster than the fronts.

Several years ago I had to get new rear tires for my '96 Corvette. Couldn't find a 285/40 so went with a 275/40. The 255/45's in front were taller. When I go into some turns, the "ASR" (early form of traction control) would kick in. It was only occasionally and mostly on tight right hand turns. But that system was not as sophisticated as the modern traction control.

MP3BOOSTED · 09-23-2019, 07:52 AM

just tell everyone you did a FWD conversion on your car.

4door65guy · 09-23-2019, 10:32 AM

Quote:

Originally Posted by MP3BOOSTED

just tell everyone you did a FWD conversion on your car.

haha OUCH! its not that big of a difference.

arpad_m · 09-23-2019, 10:55 AM

Quote:

Originally Posted by 4door65guy

I'm just going to acknowledge right off the bat that I made a decision without thinking about it and I therefore admit I am an idiot

. Today I put new tires on my Camaro. I bought Michelin Ps4s due to all the awesome reviews on here. the shop I bought them from had the 275/35/r20s but not the front 245s and since they had to order them and they were actually cheaper i had them get me 255s (not giving thought to the increase in sidewall height). Now that I have them installed and drove around all day I noticed that the front sidewalls are much bigger then the rear 275s and it looks a bit goofy. So my question is, is this going to effect the handling performance/stability controll/ABS negatively? If so ill have to just order the stock size tires and sell these on craigslist or something because better handling was the whole point of these tires. I can live with the look even though its kinda off but not hampered handling/safety. Thanks for the help in advance guys.

You may be able to return the 275's and get 285's for the rear to fix this. I did exactly that, 255/40/20 and 285/35/20, it looks reasonable and front:rear height and circumference ratios are very close to OEM, the diff is 0.1%. Zero issues from traction control or ABS. Granted, even then the front sidewall is a bit taller than the rear with these PS4S tires, but it doesn't look goofy to me.

4door65guy · 09-23-2019, 11:33 AM

Quote:

Originally Posted by arpad_m

You may be able to return the 275's and get 285's for the rear to fix this. I did exactly that, 255/40/20 and 285/35/20, it looks reasonable and front:rear height and circumference ratios are very close to OEM, the diff is 0.1%. Zero issues from traction control or ABS. Granted, even then the front sidewall is a bit taller than the rear with these PS4S tires, but it doesn't look goofy to me.

I haven't even considered the thought of seeing if they would exchange them. I figured tires were probably considered used the moment you drive the car. I was thinking ill order 285s like you did and i should be able to sell my 275s fairly easily on craigslist. And i bet it looks really good that difference isn't even noticeable id imagine. you dont have any rubbing issues with the 285s correct?

oslouie · 09-23-2019, 04:25 PM

Quote:

Originally Posted by 4door65guy

I haven't even considered the thought of seeing if they would exchange them. I figured tires were probably considered used the moment you drive the car. I was thinking ill order 285s like you did and i should be able to sell my 275s fairly easily on craigslist. And i bet it looks really good that difference isn't even noticeable id imagine. you dont have any rubbing issues with the 285s correct?

I have 305's with no rubbing.

arpad_m · 09-23-2019, 05:36 PM

Quote:

Originally Posted by 4door65guy

I haven't even considered the thought of seeing if they would exchange them. I figured tires were probably considered used the moment you drive the car. I was thinking ill order 285s like you did and i should be able to sell my 275s fairly easily on craigslist. And i bet it looks really good that difference isn't even noticeable id imagine. you dont have any rubbing issues with the 285s correct?

Quote:

Originally Posted by oslouie

I have 305's with no rubbing.

No rubbing here either.

I did have the infamous harness relocated anyway for futureproofing

09-22-2019, 06:33 PM	#1
4door65guy Drives: 2016 2SS MAG/NPP Join Date: Dec 2017 Location: Hayward, ca Posts: 115 View My Garage	Tire size mistake. Please help. I'm just going to acknowledge right off the bat that I made a decision without thinking about it and I therefore admit I am an idiot . Today I put new tires on my Camaro. I bought Michelin Ps4s due to all the awesome reviews on here. the shop I bought them from had the 275/35/r20s but not the front 245s and since they had to order them and they were actually cheaper i had them get me 255s (not giving thought to the increase in sidewall height). Now that I have them installed and drove around all day I noticed that the front sidewalls are much bigger then the rear 275s and it looks a bit goofy. So my question is, is this going to effect the handling performance/stability controll/ABS negatively? If so ill have to just order the stock size tires and sell these on craigslist or something because better handling was the whole point of these tires. I can live with the look even though its kinda off but not hampered handling/safety. Thanks for the help in advance guys.

09-22-2019, 06:53 PM	#2
Joshinator99 Moderator Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018 Location: New Ipswich NH Posts: 6,338	So what size tires did you actually order for the front? 255/40/20? Or 255/35/20? __________________ 2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, ATI 8L90, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors & BB HPFP, TooHighPSI/Katech port injection, 15” conversion 1066 WHP STD/1027 SAE, 9.10@152.5 (new times coming)

09-22-2019, 06:57 PM	#3
4door65guy Drives: 2016 2SS MAG/NPP Join Date: Dec 2017 Location: Hayward, ca Posts: 115 View My Garage	255/40/20 I probably would have been perfect if i got 255/35/20s but I just wasn't thinking about the sidewall height. and honestly didn't realize how much of a change it would have just one size up. Last edited by 4door65guy; 09-22-2019 at 06:58 PM. Reason: added more information

09-23-2019, 07:52 AM	#7
MP3BOOSTED Drives: 2017 Camaro SS 1LE (F1A-94 FBO H/C) Join Date: Jun 2017 Location: San Antonio Texas Posts: 844	just tell everyone you did a FWD conversion on your car. __________________ Performance Mods: F1A-94, DSX Flex Fuel Kit, MSD Spark Plug Wires, KOOK 2" off road headers, MBRP Race catback exhaust, Pray Performance Custom Boost Cam, Rocker Arm Trunion Upgrade Kit, 7.850" Hardened Chromemoly Length Pushrods and Johnson Racing 2110R Lifters, TSP CNC'd Heads, Ported MSD intake manifold, 103mm Katech Throttle body, Forged Pistons/Rods, RPM Meth kit, DSX Aux Fuel system, AEM Failsafe and banks gauge, LT4 HPFP, LT4 injectors, BMR motor mounts, Hurst Short Throw, Manley SS exhaust valves Videos of my car? Check here: https://www.youtube.com/channel/UCNi...Qy1OL4NVGlPogw

09-22-2019, 07:18 PM	#5
4door65guy Drives: 2016 2SS MAG/NPP Join Date: Dec 2017 Location: Hayward, ca Posts: 115 View My Garage	yeah i'm thinking its probably ok too I just don't know. I appreciate you chiming in and trying to help me out.

09-23-2019, 07:35 AM	#6
MrChrisLS3 Drives: 2018 1SS M6 Join Date: Nov 2014 Location: Houston Posts: 2,617	The issue you might run into is with the fronts being taller, the wheel speed sensors will think the rears are rotating faster than the fronts. Several years ago I had to get new rear tires for my '96 Corvette. Couldn't find a 285/40 so went with a 275/40. The 255/45's in front were taller. When I go into some turns, the "ASR" (early form of traction control) would kick in. It was only occasionally and mostly on tight right hand turns. But that system was not as sophisticated as the modern traction control.

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