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11-23-2012, 06:28 PM | #1 |
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Michelin PSS 19" Tire Size Question
Hello,
I just swapped out my 135i for a Z4 35i with 19" wheels. I plan on immediately swapping the run flats for PSS. Any problems if I size up to 235/35 in the front and 265/30 in the rear? On my 1'er, rub was always a concern but not sure how tricky these Z4's are. I hear horror stories about cracked 296 style wheels and the slight extra height can't hurt either, I suppose. Appreciate the advice. |
11-23-2012, 07:47 PM | #2 |
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I have a 2011 35is with 19s. I ditched the run flats and put 235 35-19 on the front and 275 30-19 on the rear with no problems at all.
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11-24-2012, 10:08 AM | #3 |
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^^^
sorry to hijack the thread but can you tell me what difference the PSS's made to ride quality? i find the 19's don't jar you but the ride is jittery and believe this is down to RFT's. as far as sizing new tyres try this link to give you rolling sizes and wall heights etc http://www.kouki.co.uk/utilities/vis...ize-calculator interestingly, as i was contemplating downsizing to 18's for comfort, the difference in wall height is only 16.5% compared to 19's, so i don't know if that would be noticeable. certainly not as much as just changing to non-rft's and keeping the same wheel size edit: SCBMW02. I just worked out that with your rears you have increased the side by 6mm, and fronts by 3.5mm which is halfway between the gain made by 18's on the rear (12.75mm normal difference) and less than a third on the fronts (11.25mm normal) but probably messed up your speedo? Last edited by Pacemaker1000; 11-24-2012 at 10:30 AM.. |
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11-24-2012, 10:59 AM | #4 | |
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From my experience with 18's on my 135i, the PSS's run a little wider than most tires for any given size. Just don't want any rubbing. I have them ordered, should be here Tues. |
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11-24-2012, 11:02 AM | #5 | |
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11-24-2012, 05:24 PM | #7 |
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Just a question but without the RFTs what are you guys doing for a spare tyre solution? I'm looking at changing at some time but not sure about losing permanent boot space for a spare tyre
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11-25-2012, 12:21 PM | #9 | |
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http://www.amazon.com/Slime-70005-Sa...=pd_sim_auto_1 |
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11-25-2012, 12:24 PM | #10 |
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Drives: 2019 X5 40i and 2022 Z4 M40i
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I bought the M mobility fix it kit that comes with M cars from BMW for $150
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11-26-2012, 11:33 AM | #11 | |
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Glad to see another Z owner from SD on the boards! |
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11-26-2012, 02:47 PM | #12 |
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11-26-2012, 04:20 PM | #13 | |
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What ended up happening to me (1/4" nail puncture in the center of tread block, nail still embedded) is that the "goop" didn't actually form a seal and the air loss wasn't stopped at all. I had to overinflate the tire and cross fingers there was enough air to get to a tire shop. I've also heard the "goop" ruins the TPMS but I have no first hand experience because this was on a non TPMS car. EDIT: personally, I think the BMW kit is a rebrand of slime or some other similar product at a big mark up, and i wouldn't trust it. I don't have tech to back that up but that's my opinion and the reason i stick with RFT |
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11-28-2012, 11:50 AM | #14 | |
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Anyway, I got the PSS's installed the other day. They are great, the increased grip is amazing, ride nominally smoother. They seem to have slightly higher road noise, which is opposite of my experience with them in my 135i. I have not fooled around with pressures yet, but will. No fit issues with the 235/35/19 fronts and 265/30/19 rears. They fill in the wheel wells a little better too. |
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11-28-2012, 02:37 PM | #15 | |
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What about he speedo? Any change? And if so is it a higher or lower reading? |
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11-28-2012, 03:03 PM | #16 | |
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Not sure about the speedo, I'll need to check. As the diameter is slightly larger, it may be a little low. In my experience, BMW calibrates the speedos on the high side anyway, so it may actually be MORE accutate than before. |
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11-28-2012, 05:13 PM | #17 | |
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11-28-2012, 05:56 PM | #18 | |
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11-28-2012, 06:06 PM | #19 | |
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11-29-2012, 01:18 PM | #20 |
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speedo readings please?
in UK ALL Minis without RFT's come with a pump and sealer. Maybe worth checking what they use? edit: http://www.realoem.com/bmw/showparts...=71&fg=95&hl=1 Last edited by Pacemaker1000; 11-29-2012 at 01:29 PM.. |
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11-29-2012, 09:16 PM | #21 |
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You can lookup the diameter of various size and make of tires to determine the variable to plug into the formula. Diameters vary by tire manufacturers for the same sizes. It's not an exact science as temps and pressure are variables to acknowledge.
I used the PSS 19" diameter for 265-30 for the following graphic of a spreadsheet.
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11-30-2012, 12:01 PM | #22 | ||
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Coding: It is pretty easy to have someone activate the digital velocity indicator in the car and then tell the car to show the actual mph. The analog gauge will read high, but your digital will be right on. There are Indy shops that'll do this as well as a few guys remotely. Check out the E90 page-coding forum and you'll find all kinds of other cool things you can turn on for our cars.
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