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      12-09-2022, 06:35 PM   #1
Nykrayz
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Truck it I did it. Changed tires

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Few days ago I posted about considering michellin pilot sport all season 4 ( I have these on my m8 and they worked really well during recent snow in Seattle)

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.
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      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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Originally Posted by BroBacon View Post
Are you planning to run these year round or swap the pilot sports back on in summer?
. I do have stock pirellis. Most likely change to them in summer as being lowered my inner front tire wall will wear down quick
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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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Quote:
Originally Posted by BroBacon View Post
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?
I don’t have a good answer on that. Thing is I am lowered if anything ever happens to my differential or transfer case I am sure bmw will try to deny it. There is post on here with someone on m8 blowing transfer case apparently bmw denied warranty based on lowers car. Not tires and he was running tires with good variance difference
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, 04:19 PM   #7
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Originally Posted by nZtiZia View Post
what are the tire sizes for the 21 front/22 rear stock setup?
295 35 21 front
315 30 22 rear
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      12-11-2022, 04:33 PM   #8
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Quote:
Originally Posted by BroBacon View Post
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?
as he mentioned, OEM 21"F/22"R setup already has a 1% variance between front and back. the new sizes cause a 3.3% variance (delta 2.3% from stock setup). risky.

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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Quote:
Originally Posted by mjr24 View Post
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.
please correct me if i am wrong way i calculated variance was
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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Quote:
Originally Posted by -Vanguard- View Post
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.
this is more to do with seattle weather though we get some snow even in winter its mostly rain and i have first hand experience with these michellin in both rain and snow on my m8 and they perform great. I was concerned about wet traction on scorpion winter

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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Quote:
Originally Posted by Nykrayz View Post
please correct me if i am wrong way i calculated variance was
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?
Yes, it is. Go to a tire calculator.
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      12-11-2022, 09:29 PM   #14
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tire calculator, math isn't that difficult
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      12-11-2022, 09:51 PM   #15
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Quote:
Originally Posted by mjr24 View Post
Yes, it is. Go to a tire calculator.
Quote:
Originally Posted by Tejas1836 View Post
tire calculator, math isn't that difficult
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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Quote:
Originally Posted by mjr24 View Post
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.
Valid point I did not know that. But one also has to keep in mind diameter is directly proportional to circumference. So said circumference will be different using 29.4 vs 29.5 diameter. I am not sure by how much but it should put it over the 1%

Not trying to be argumentative
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      12-12-2022, 07:04 AM   #18
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Quote:
Originally Posted by Nykrayz View Post
Valid point I did not know that. But one also has to keep in mind diameter is directly proportional to circumference. So said circumference will be different using 29.4 vs 29.5 diameter. I am not sure by how much but it should put it over the 1%

Not trying to be argumentative
for the sake of accuracy, proportional doesn’t mean the same as equal, though, so one shouldn’t use the value of one measurement in lieu of the other measurement. in this situation, circumference is the correct value to use.

“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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Quote:
Originally Posted by nZtiZia View Post
for the sake of accuracy, proportional doesn’t mean the same as equal, though, so one shouldn’t use the value of one measurement in lieu of the other measurement. in this situation, circumference is the correct value to use.

“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
to clarify what i meant was that for the circumference to change diameter has to change as well whether up/down
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      12-12-2022, 04:28 PM   #20
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Quote:
Originally Posted by Nykrayz View Post
to clarify what i meant was that for the circumference to change diameter has to change as well whether up/down
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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Quote:
Originally Posted by Nykrayz View Post
Valid point I did not know that. But one also has to keep in mind diameter is directly proportional to circumference. So said circumference will be different using 29.4 vs 29.5 diameter. I am not sure by how much but it should put it over the 1%

Not trying to be argumentative
No worries bud, I’m not either. I wanted to go with different size tires since there are no all season options for those rim sizes and I got scared off by the 1 percent thing. The one percent thing might just be a myth.
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      12-12-2022, 04:54 PM   #22
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Quote:
Originally Posted by nZtiZia View Post
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.
not what i was trying to say i guess it just came across
apologies
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