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12-08-2022, 12:11 PM
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#1 |
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Alphanumeric
Join Date: Aug 2005
Carmudgeonly Ride: 981S, 340i
Posts: 9,526
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load ratings?
The rear summers on my 340i will need replacing soon (they are down to 5/32nds or so). They are PSS, not the latest and greatest PS4 but they suit the car fine and the fronts have a good amount of life left (staggered).
A pair of right size tires with lots of life left have popped up locally. I guess the 255/40/18 size that is a rear for my car is a front for some kind of AMG merc. I'm very tempted to snag the pair... But here is the dilemma, at the last moment, I noticed that my tires are 99Y and these are 95Y. I'm thinking I can get away with this by simply keeping on top of rear pressures and making sure not to overload my car. I currently run 33 front and 35 rear and generally the fronts heat up more than the rear as car is an xdrive with something like a 52/48 distribution. Or should I be a stickler and pass until I match the load rating? Never going to see the track. |
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12-08-2022, 12:28 PM
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#2 |
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Relic
Join Date: Oct 2003
Location: Bethesda, MD
Posts: 12,374
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Minimal rating difference. You aren't tracking the car. You're unlikely to be loading the axle that heavily.
That said... Old PSS tires really, really, really suck. I wouldn't do it for that reason.
__________________
2011 M3 2006 Sierra 2500HD 4WD LBZ/Allison 2004 X5 3.0i 6MT 1995 M3 S50B32 1990 325is 1989 M3 S54B32 Hers: 1989 325iX 1996 911 Turbo 
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12-08-2022, 12:29 PM
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#3 |
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Alphanumeric
Join Date: Aug 2005
Carmudgeonly Ride: 981S, 340i
Posts: 9,526
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Bit more info... BMW specifies a whole range of tires for the f30 340i, square and staggered. Most of these are runflats with rear load ratings ranging from 91 to 95. The only non-runflat tire set was stock on my car with the track handling package with XL rated Michelin PSS.
I don't think there will be an issue. I don't plan on doing autobahn speeds with the car loaded to GVWR. (And even then the axle load is apparently supported by the other tire sets) |
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12-08-2022, 12:30 PM
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#4 | |
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Alphanumeric
Join Date: Aug 2005
Carmudgeonly Ride: 981S, 340i
Posts: 9,526
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Quote:
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12-08-2022, 12:30 PM
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#5 | |
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Relic
Join Date: Oct 2003
Location: Bethesda, MD
Posts: 12,374
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Quote:
__________________
2011 M3 2006 Sierra 2500HD 4WD LBZ/Allison 2004 X5 3.0i 6MT 1995 M3 S50B32 1990 325is 1989 M3 S54B32 Hers: 1989 325iX 1996 911 Turbo
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