Howdy!
I’ve been dailying my
987.2
base which is pretty stock. It is largely highway commuting, although occasionally I take the twisty mountain road instead (but inevitable traffic on that makes it not very fun). It still has the Sumitomo HTR Z5 tires it came with in the stock 18” sizes.
I was checking tire wear last weekend and noticed that the center of the rear tires is definitely more worn than the edges. This is usually indicative of too high of tire pressure, but I’ve been running it at 33-34psi cold, (and 31 in front), but I’ve never had this problem before (but I’ve also never ran tires this wide, either).
The door jam sticker says 30F/31R. Is that 3psi enough to appreciably wear the center of the tire more than the edges? I figured that since the
987.1
specified much higher pressure, this would be ok… maybe not?
I'm going to guess that the several pounds above recommendation is in fact sufficient to affect the center tread wear. And, while the pressure recommendations were in fact higher on the .1 models, it's my understanding that the suspension setups were different enough to justify the different tire pressure recommendations. My opinion is based on reading as much as possible regarding the 987s over the past 17 or so years of
987.1
ownership. Cheers.
Can you elaborate a little more on this, as I thought the suspension setups and tire sizes were unchanged between
987.1
and
987.2
?
Just what I've read over the years and was told by a dealer's service manager, after trying to understand why. Unfortunately I'm unable to elaborate.
Highway driving will wear the center a bit faster due to centrifugal forces and less edge where due to little hard cornering.
Thank you all for the replies. I’m still trying to wrap my head around if I am running below the
987.1
recommended pressure (isn’t that like 38 rear? I don’t really know), it surprises me that 34psi would show up as center wear. I’d imagine the 987.1s that were dailies really had even more exaggerated tire wear?
I’ve already dropped the pressure closer to 31, fwiw.
Simply put, your cold pressures are too high. You have the evidence, time to heed that!
Noted and already done, but it sure seems like all the
987.1
folks with a door jam sticker calling for 37psi rear would ALL be having this tire wear pattern - even more so than I am.
Makes me wonder if it is a specific tire thing (not many people are using the tires that I have on my car) or some other reason.
