12-09-2022, 06:35 PM | #1 |
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Truck it I did it. Changed tires
Featured on BIMMERPOST.com I got them installed today. Stock 818 rims Front 295 40 21. Rear. 295 40 22 I am lowered with mss springs. Back is fine. Install was breeze though guys at discount tire felt maybe my front rubs a little on the air vent cup that sticks out in fender when the tires are fully turned. I did not notice it. I stuck my hand in there with tires turned fully. Drove about 125 miles so far. They feel great. Not sure if this is legit. I tested speedo with Waze and speed on odometer was same as Waze. Not the greatest pics. Been busy and just snapped them at car wash Also I know I should maybe put spacers on. But nope my wife already busted side wall on brand new tire parking within 2 weeks. |
12-11-2022, 01:06 PM | #2 |
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Are you planning to run these year round or swap the pilot sports back on in summer?
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12-11-2022, 01:11 PM | #3 |
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12-11-2022, 01:22 PM | #4 |
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Awesome - Ive been trying to figure out what tires to run on my 809M - and am thinking about going this route.
I posted in your other thread - is there any warranty concern due to diameter variance? |
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12-11-2022, 03:00 PM | #5 | |
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Way I thought of it is that some people go 22 all around. Some have done 22 front 23 rears. I am sure wheel weight has to add to stress on components as well. I did research on variance but got no good answer. Some claim 1% and below but as I said stock is 1.3 already. With this setup I am 3.3 ish. It’s my wife’s daily anyways and in 27 or so months only 21k miles. Not really driven much. So I am taking a chance but I am comfortable. One would think if difference between front and rear is significant then traction should be set off |
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12-11-2022, 04:13 PM | #6 |
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what are the tire sizes for the 21 front/22 rear stock setup?
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12-11-2022, 04:33 PM | #8 | |
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does any other X5M owner run these new sizes? Last edited by nZtiZia; 12-11-2022 at 04:44 PM.. |
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12-11-2022, 04:37 PM | #9 |
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Yeah the OEM difference is 0.9 I believe…..the rule of thumb for X Drive vehicles has always been 1 percent or under.
3.2 is risky.
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12-11-2022, 04:55 PM | #10 |
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If youre going back to summers but get all season when you can get the scorpion winters in stock 21/22 sizing for winter season?
This only makes sense if you want to run them all year long. |
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12-11-2022, 05:23 PM | #11 | |
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For stock pirelli front diameter is 29.1 and 29.5 (rear) --> from tire rack i simply took percent difference between 29.1 and 29.5 and got 1.37 for variance --> is this wrong? |
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12-11-2022, 05:27 PM | #12 | |
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Ideally i would prefer to rock these michellin year round but only reason i am considering changing back to summer tires come summer is front inner tire wall wear while being lowered on mss springs. Figured with 2 sets of new tires (new michellins and stock pirellis) now i can last bit longer |
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12-11-2022, 08:33 PM | #13 |
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Yes, it is. Go to a tire calculator.
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12-11-2022, 09:51 PM | #15 |
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Those online tire calculators are wrong maybe? They are using 29.4 diameter for rear tires for 315 30 22
I checked on tire rack diameter is 29.5 at least for pirellis. So plug that in stock variance is 1.3 I also confirmed odometer reading with Waze and my radar —- it’s same If at all maybe maybe 0.5mph difference Either way I am content with my setup |
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12-11-2022, 10:12 PM | #16 |
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You realize that you are supposed to be looking at the circumference number and not the diameter number, right?
Either way, if it works for you, go for it.
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12-12-2022, 12:24 AM | #17 | |
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Not trying to be argumentative |
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12-12-2022, 07:04 AM | #18 | |
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“proportional is at a constant ratio (to) two magnitudes (numbers) are said to be proportional if the second varies in a direct relation arithmetically to the first while equal is (label) the same in all respects….” https://youtu.be/JSLsfxm4ntE |
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12-12-2022, 03:52 PM | #19 | |
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12-12-2022, 04:28 PM | #20 |
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true, but originally you used the diameter in your calculations and defended its use by saying it’s proportional to circumference. can’t use one in place of the other.
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12-12-2022, 04:31 PM | #21 | |
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12-12-2022, 04:54 PM | #22 |
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