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      02-06-2020, 05:40 PM   #1
chetman7
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Does Tire load range matter?

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Currently have conti ecs tires 255/275 combo on 19s

I dont drive the car often as it's a second car and i was thinking of maximizing my limited time with the car with a gripper rear tire.

My front tires on the ecs tread are still 8/32 and I have had the car for 2 years.

I was thinking of swapping my rears to 285/35 of the ecs and keeping the fronts. Went on tire rack and noticed it is not an "XL" tire. Does that matter? Its listed as SL

Any advice is appreciated
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      02-07-2020, 11:39 AM   #2
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You will need to check the load index beyond just the sl/xl to see if it is the same as stock or higher. The load range of xl vs sl is based on the PSI for carrying the max load of the tire. Xl is 42 vs the sl at 36. Look for the 2-3 numbers before the speed rating and those should be your load index. For example, 275/30R20 97(Y)
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      02-07-2020, 02:39 PM   #3
chetman7
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Quote:
Originally Posted by Ropes View Post
You will need to check the load index beyond just the sl/xl to see if it is the same as stock or higher. The load range of xl vs sl is based on the PSI for carrying the max load of the tire. Xl is 42 vs the sl at 36. Look for the 2-3 numbers before the speed rating and those should be your load index. For example, 275/30R20 97(Y)
The ecs 275/35/19 xl is 100Y

The 285 is SL 99Y

The 295 is a XL 104Y
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      02-09-2020, 12:20 PM   #4
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The 275 is rated for 1764 @ 42 psi

The 285 is rated for 1709 @ 36 psi

The 295 is rated for 1984 @ 42 psi

The side wall may flex more under the 285 compared to the 275 do to the less reenforcement giving it the SL rating. The 285 also has a 55 lbs lower load rating which is negligible. If concerned why not go to the 295?
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      02-09-2020, 01:02 PM   #5
chetman7
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Quote:
Originally Posted by Ropes View Post
The 275 is rated for 1764 @ 42 psi

The 285 is rated for 1709 @ 36 psi

The 295 is rated for 1984 @ 42 psi

The side wall may flex more under the 285 compared to the 275 do to the less reenforcement giving it the SL rating. The 285 also has a 55 lbs lower load rating which is negligible. If concerned why not go to the 295?
Dont know too much about tires . I was looking to place it on a 10" wide wheel.
Wasnt sure how 295 would feel on a narrow wheel. For some reason I thought I read somewhere that bmw recommends XL tires for all new m3/m4s but I cant find the literature through google or manual.

Nervous about buying new tires and hating them and starting all over again
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      02-09-2020, 02:41 PM   #6
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Many of us on here run a 285 rear tire with no issues. But if you are really concerned then just stick with 275.
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      02-09-2020, 02:47 PM   #7
chetman7
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Quote:
Originally Posted by gatorfast View Post
Many of us on here run a 285 rear tire with no issues. But if you are really concerned then just stick with 275.
Wasnt worried about the size. I was concerned of the SL rating and handling dept, as all the oem tires seems to be XL tires.

I'm totally over thinking is aren't I? Lol
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      02-09-2020, 04:32 PM   #8
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I run 295 on the stock ZCP rims which are 10" wide and that works great. The tire has a squared off look and not a stretched look. With tires it's all a compromise on what you are after. Tire compounds, wet/dry handling, noise, wear rate, feel, comfort, etc. Best of luck with your decision.
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      02-11-2020, 07:15 AM   #9
chetman7
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Fyi as an update. Spoke with bmw and they said the minimum requirements for the rears are 100Y XL.
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      02-11-2020, 11:06 AM   #10
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The oem contis on my oem 19s were xl rear and sl front. In my personal experience I have always wanted an xl at all for corners. Typically an xl tire has two sidewall plies which makes the sidewall stiffer, however this doesn't mean every xl has two ply sidewalls and that sl's have single ply sidewalls. The Advan AD08 is an sl tire with two ply sidewalls.

Switching to a xl up front (for me) with same oe size got rid of the squishiness (ie understeer) i felt on turns in the front in my f80.
You are not over thinking it. Tires are extremely important especially on the f80.
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      02-11-2020, 03:57 PM   #11
chetman7
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Ended up playing It safe.

Just ordered 285/35 ps4 for my 19x10 rears. Of course they are backordered and tirerack has no idea when they will come in. I'll end up with 255 up front. Both tires are xl rated and meet bmw specs
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