11-27-2022, 10:19 PM | #1 |
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Tire Replacement.....When?
I installed Michelin PS4S at 11K. I am now at 37K. I keep them at 38F - 45R (staggered set up) and cross axle every 3.5K.
The rotation has been done today. Front are 7/32 and rear 6/32. When is it time to consider new tires on RWD?
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11-27-2022, 11:58 PM | #2 |
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4/32nds or 6 years due to inherent rubber compound deterioration over time.
Last edited by Sportstick; 11-28-2022 at 10:02 AM.. |
11-28-2022, 12:44 AM | #3 |
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I may have took exceptional care of them. I was told when I bought they would not go over 20 - 25K. So, I am surprised they are still in good shape.
I believe they are doing fine because I keep them at the recommended pressure from OEM specs and my driving is mostly freeway and very conservative.
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11-28-2022, 09:21 AM | #4 |
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Proper inflation & judicious rotating (contrary to BMW's suggestion!) can result in longer wear.
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11-29-2022, 05:12 AM | #5 |
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Quite a lot of performance tires are designed to maintain the same warm, dry braking distance down to 4mm (5/32") but will then degrade rapidly. I generally think about replacing mine somewhere between 4mm-3mm (5/32"-4/32" or 1/8") even 'though the UK legal limit is much lower. The differences often are amplified in cold/wet conditions. For an example, see below.
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11-29-2022, 05:44 AM | #6 |
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OP: the tire pressures that you report (38F, 45R) are higher than those recommended by BMW. Any reason for that? Are those pressures recommended by Michelin? Just curious.
In any case, you now have 26K miles on the tires, which is not far outside the window of normal use. |
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11-29-2022, 06:40 AM | #7 | |
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Quote:
Also, it may have been cherrypicked from data for a wide variety of tire types. |
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11-29-2022, 11:07 AM | #8 |
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11-29-2022, 11:14 AM | #9 |
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These cars are also more prone to wear on the inside rear / outside front edges due to camber (or lack thereof). Increasing the pressure makes them wear a little more evenly at the expense of overall grip. That wouldn't be an issue on the highway though.
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11-29-2022, 12:45 PM | #10 | |
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I've posted this link before, but no harm in doing so again... https://www.motortrend.com/features/...ssure-sticker/ |
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11-30-2022, 07:54 AM | #11 | |
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Quote:
The graph underlines that leaving the tires on from the half-worn 4mm to the entirely legal ¾-worn 2mm point adds 19 feet to the dry, warm braking distance. Which is no small addition. You read a lot of people on this and related forums saying that they'll run their tires down to the legal minimum over the summer because in the dry and warm, the tread depth doesn't matter. People will often use the terms 'slicks' but slick track tires will have a completely different design: road tires aren't designed to be used like racing slicks. And thus as you can see, tread depth does matter, very much. In part this will be because the compound chemistry of the belts that are formed into a single tread is different, with the outer belts getting the more exotic compound mix and the inner ones something less effective. This on the assumption that for a performance tire, the owner is likely to replace it well before the legal minimum tread depth is reached, so there's no point in investing in costly compounds for the inner tread belts. Now, this isn't always the case - some manufacturers like Michelin, pride themselves on building certain tires that give a consistent stopping distance right through to the minimum legal tread depth. But these won't be performance tires, like the one in the graph. They'll be the sort fitted to mainstream, small-engined hatchbacks and sedans. But I do understand the annoyance around people truncating substantial parts of graphs and histograms in competitive or similar graphics in order to amplify differences beyond the significant. You get a lot of this on tire reviews where on a scoring of, say 100, the differences between the worst and best are only 10 and between the top five is only 5 or 6 points. Making you wonder how the drivers can be so sensitive to such differences and whether the ordinary driver would feel them at all. Chopping-off the first 90 points makes it look like there are bigger differences than there really are. And as you say, for some reason, many manufacturers seem to insult the intelligence of their US customers by over-simplifying things like tire pressures, as if you can't cope with anything more than a single generalised setting, which is patronising. My door sticker happily carries multiple values for a wide variety of scenarios across summer, winter and different wheel/tire sizes:
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11-30-2022, 12:07 PM | #12 | |
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12-03-2022, 12:25 AM | #13 | |
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12-03-2022, 01:56 PM | #15 | |
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Personally the lower you keep your tires the less effective they are, Tires and the most important part of your car bar none. I used to wait till I could feel the wear sensor. But yes 3mil is bare minimum Also if you have AWD it is sensitive to differences in tire wear both front to back and on the axels There is a spec |
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