M5 offset wheels on 530i > Safer aspect ratio than stock?
03-05-2011, 07:47 PM
#1
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Hi, guys
From researching countless posts on this board (!!!) I'm pretty sure that the "best" 19' tire size for my 2007 530i should be F: 245/35 and R: 275/30, and the ET varies by wheel.... correct?
However, I just bought some 19' SF-71 on Craigslist and they came off an M5. Their offset is ET35 (front) and ET20 (rear)? at least, that?s what the post said. -- Is that possible?? I?m still waiting for confirmation (or correction), but would like to do some tire research in the meantime.
To sum it up:
A:>> Can I run wheels with the stated offset if I use the stock front bumper & the OEM M5 rear on my 530i (OEM Sport Suspension)?
B:>> Some time back, I read that some folks on this board are actually running 19' F:255/R:285 tires on their E60s without rubbing (?but I cannot find the post anymore...). Moreover, I just found a post by Anzafin that stated 285s on rear is fine.
So, what aspect ratio (tire height vs. width) would you recommend if I wanted to run F:255/R:285 tires and "play it safe" with regard to the lousy roads (potholes & bumpy train crossings) around here, as I don?t want to bend or crack my rims. Of course, rubbing should be out of the question, too. Or, is 255/30 and 285/35 the only option?
I understand that choosing a larger ration gives me more sidewall protection and stability, which is probably what I?m looking for.
Could I do 255/40/19 and 285/35/19, or would that be a bad idea? e.g. look flat-out st*pid? (TireRack has those sizes available, at least?)
Your expert advice is much appreciated? Thx!
From researching countless posts on this board (!!!) I'm pretty sure that the "best" 19' tire size for my 2007 530i should be F: 245/35 and R: 275/30, and the ET varies by wheel.... correct?
However, I just bought some 19' SF-71 on Craigslist and they came off an M5. Their offset is ET35 (front) and ET20 (rear)? at least, that?s what the post said. -- Is that possible?? I?m still waiting for confirmation (or correction), but would like to do some tire research in the meantime.
To sum it up:
A:>> Can I run wheels with the stated offset if I use the stock front bumper & the OEM M5 rear on my 530i (OEM Sport Suspension)?
B:>> Some time back, I read that some folks on this board are actually running 19' F:255/R:285 tires on their E60s without rubbing (?but I cannot find the post anymore...). Moreover, I just found a post by Anzafin that stated 285s on rear is fine.
So, what aspect ratio (tire height vs. width) would you recommend if I wanted to run F:255/R:285 tires and "play it safe" with regard to the lousy roads (potholes & bumpy train crossings) around here, as I don?t want to bend or crack my rims. Of course, rubbing should be out of the question, too. Or, is 255/30 and 285/35 the only option?
I understand that choosing a larger ration gives me more sidewall protection and stability, which is probably what I?m looking for.
Could I do 255/40/19 and 285/35/19, or would that be a bad idea? e.g. look flat-out st*pid? (TireRack has those sizes available, at least?)
Your expert advice is much appreciated? Thx!
03-05-2011, 08:39 PM
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Sounds like you got "M3" set up you'll need hub centric spacers for the front( M5 are 12F 28R). You'll have to mod your front fenders to fit a 255 on the front. Best tire size is correct a 285/35 might not fit if your offset is 20 they'll stick out to much and could rub. A safe setup would be 245/35 F and 275/35. The speedo might be off but you'll have rim protection
03-06-2011, 09:32 AM
#3
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You cannot run 255/40/19 on the front with a non-m5 fender.
The Max you can go is 245/40/19 - I have this setup and have no rubbing at all on my front.
On the rear I believe you should be fine running 285/35/19 if you roll your fenders but with those offsets you have cant say for sure.
If I were you I would run
245/40/19 on the front
275/35/19 on the rear.
PS - You might\might not have to ROLL YOUR FENDERS on the rear.
The Max you can go is 245/40/19 - I have this setup and have no rubbing at all on my front.
On the rear I believe you should be fine running 285/35/19 if you roll your fenders but with those offsets you have cant say for sure.
If I were you I would run
245/40/19 on the front
275/35/19 on the rear.
PS - You might\might not have to ROLL YOUR FENDERS on the rear.
03-06-2011, 12:31 PM
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You cannot run 255/40/19 on the front with a non-m5 fender.
The Max you can go is 245/40/19 - I have this setup and have no rubbing at all on my front.
On the rear I believe you should be fine running 285/35/19 if you roll your fenders but with those offsets you have cant say for sure.
If I were you I would run
245/40/19 on the front
275/35/19 on the rear.
PS - You might\might not have to ROLL YOUR FENDERS on the rear.
The Max you can go is 245/40/19 - I have this setup and have no rubbing at all on my front.
On the rear I believe you should be fine running 285/35/19 if you roll your fenders but with those offsets you have cant say for sure.
If I were you I would run
245/40/19 on the front
275/35/19 on the rear.
PS - You might\might not have to ROLL YOUR FENDERS on the rear.
Have a hard time finding the Conti Extreme DW (245/35) in stock anywhere anyway, so I might just get the 245/40 instead.
Good call, bro... much appreciated!
Almost forgot about wanting to "play it (a bit more) safe"...
03-06-2011, 02:02 PM
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One more quick question, TheRacerBoss:
Do you have spacers on your fronts?
The wheelstires I'm getting are ET35 (front), and that's why I just bought 15mm spacers.... should work OK with the 245/40-19 front tires, right? The rear wheels are ET20, so I won't need to change anything here... if my math is correct.
What do you say?
Would be nice to know that I did something *right* for a change... LOL
Thx,
Armin
Do you have spacers on your fronts?
The wheels
What do you say?
Would be nice to know that I did something *right* for a change... LOL
Thx,
Armin
03-07-2011, 08:47 AM
#6
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I dont have spacers on my front, its just the M5 wheels and let me tell you, its pretty far out with those 245/40/19.
Tire protection man, I just drive on pot holes and know for sure that I am safe. It might sound silly how I say that but I was running 245/35/19 on my front before and may I spell out my experience
1. HEAR the road
2. Fell every damn pebble on the streets man
Now -- I with the 245/40/19 -----I just GLIDE
As long as you have the M5 oem offset size you should be fine my friend. Just check on the offset numbers for both again. I know when I was installing that 40 profile tire, the distance between my shock absorber and my tire was only a pinky. So the tire was like a perfect match to the maximum limits.
The reason I tell you that my front M5 wheel is pretty far out is because when you have a 40 profile tire the side wall is a little rounded -- Thus needing a little more space, if you know what I mean.
Tire protection man, I just drive on pot holes and know for sure that I am safe. It might sound silly how I say that but I was running 245/35/19 on my front before and may I spell out my experience
1. HEAR the road
2. Fell every damn pebble on the streets man
Now -- I with the 245/40/19 -----I just GLIDE
As long as you have the M5 oem offset size you should be fine my friend. Just check on the offset numbers for both again. I know when I was installing that 40 profile tire, the distance between my shock absorber and my tire was only a pinky. So the tire was like a perfect match to the maximum limits.
The reason I tell you that my front M5 wheel is pretty far out is because when you have a 40 profile tire the side wall is a little rounded -- Thus needing a little more space, if you know what I mean.
03-07-2011, 10:29 AM
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I dont have spacers on my front, its just the M5 wheels and let me tell you, its pretty far out with those 245/40/19.
Tire protection man, I just drive on pot holes and know for sure that I am safe. It might sound silly how I say that but I was running 245/35/19 on my front before and may I spell out my experience
1. HEAR the road
2. Fell every damn pebble on the streets man
Now -- I with the 245/40/19 -----I just GLIDE
As long as you have the M5 oem offset size you should be fine my friend. Just check on the offset numbers for both again. I know when I was installing that 40 profile tire, the distance between my shock absorber and my tire was only a pinky. So the tire was like a perfect match to the maximum limits.
The reason I tell you that my front M5 wheel is pretty far out is because when you have a 40 profile tire the side wall is a little rounded -- Thus needing a little more space, if you know what I mean.
Tire protection man, I just drive on pot holes and know for sure that I am safe. It might sound silly how I say that but I was running 245/35/19 on my front before and may I spell out my experience
1. HEAR the road
2. Fell every damn pebble on the streets man
Now -- I with the 245/40/19 -----I just GLIDE
As long as you have the M5 oem offset size you should be fine my friend. Just check on the offset numbers for both again. I know when I was installing that 40 profile tire, the distance between my shock absorber and my tire was only a pinky. So the tire was like a perfect match to the maximum limits.
The reason I tell you that my front M5 wheel is pretty far out is because when you have a 40 profile tire the side wall is a little rounded -- Thus needing a little more space, if you know what I mean.
The offset will be 20 on his setup, not 14mm..It will be close.
03-09-2011, 03:05 PM
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You cannot run 255/40/19 on the front with a non-m5 fender.
The Max you can go is 245/40/19 - I have this setup and have no rubbing at all on my front.
On the rear I believe you should be fine running 285/35/19 if you roll your fenders but with those offsets you have cant say for sure.
If I were you I would run
245/40/19 on the front
275/35/19 on the rear.
PS - You might\might not have to ROLL YOUR FENDERS on the rear.
The Max you can go is 245/40/19 - I have this setup and have no rubbing at all on my front.
On the rear I believe you should be fine running 285/35/19 if you roll your fenders but with those offsets you have cant say for sure.
If I were you I would run
245/40/19 on the front
275/35/19 on the rear.
PS - You might\might not have to ROLL YOUR FENDERS on the rear.
I'm *theoretically* aware that there is such as thing as "aspect ratio" (=ratio of sidewall height to section width)... which is - in your suggestion - 40 for the fronts, and 35 for the rears.
BUT...I've never been any good in math, and that may just be the reason why I can't figure out why the ratio of the fronts is higher than the rears....??!
Shouldn't that be equal, or vice versa... and if not, what does this mean?
I just got my rears delivered (fronts arriving tomorrow), and aside from the fact that they look awesome
(read "super-wide"), they look rather "low profile".So, why is it that I'm running a larger profile in the front... because of weight (=engine)?
I actually am a bit concerned about the looks... and got a little bit nervous in the process ... (as you probably can tell ...LOL)
Please be so kind as to "illuminate me"...
Thanks,
Armin
P.S.: I got Conti DW in F: 245/40-19 and R: 275/35-19... as suggested
03-10-2011, 02:42 PM
#10
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Why are profile ratios in the front higher when compared to the Rear ?
Okay,
1. You agree that both your wheels are 19inches diameter (Correct)
2. So now considering the radius for all 4 wheels will be 9.5 inches (Correct)
3. Our main goal with the calculation on the tires here is to have all 4 tires add the same height to the car all over (Correct)
4. Okay, now look at your rear tire
It is 275/ 35/19
Forget the 19 since that is common on all 4 wheels
consider 275/35 = Lets actually do the math on these
What is 275 * 35%
275* 35/100 (275 multiplied with 35) then divide by 100
= 96.25 (Correct)
So your sidewall height is 96.25 mm on the Rear Tyre (Remember this)
Same way for the front
245*40/100
= 98 mm
So now we are Xtremely close, there is virtually no difference between 96.25 and 98mm (correct)
You will say -- Racer they are different and they are not the same.
Okay let me explain
Convert mm to inches (Google a mm to inches calculator)
Converting 96.25 mm to inches = 3.78 inches (Lets say 3.8 inches)
Converting 98mm to inches = 3.85 inches
Now let me ask you -- Can your eye tell me the difference between 3.8 and 3.85 inches on a tire mounted on a car
IT CANNOT (period)
Thats why they are virtually the same.
Now lets suppose you had gotten a 35 profile tire in the front
you would have to buy 245/35/19 -- Do the math again
245 * 35 / 100
85.75 mm
3.3 inches
Comparing 245/35/19 and 275/35/19 on your car
front in inches will be 3.30
Rear in inches will be 3.85
you will have a front tire that is half inch shorter than the rear tire (lol) A sharp eye can catch this very easily
You dont want that buddy!
Okay,
1. You agree that both your wheels are 19inches diameter (Correct)
2. So now considering the radius for all 4 wheels will be 9.5 inches (Correct)
3. Our main goal with the calculation on the tires here is to have all 4 tires add the same height to the car all over (Correct)
4. Okay, now look at your rear tire
It is 275/ 35/19
Forget the 19 since that is common on all 4 wheels
consider 275/35 = Lets actually do the math on these
What is 275 * 35%
275* 35/100 (275 multiplied with 35) then divide by 100
= 96.25 (Correct)
So your sidewall height is 96.25 mm on the Rear Tyre (Remember this)
Same way for the front
245*40/100
= 98 mm
So now we are Xtremely close, there is virtually no difference between 96.25 and 98mm (correct)
You will say -- Racer they are different and they are not the same.
Okay let me explain
Convert mm to inches (Google a mm to inches calculator)
Converting 96.25 mm to inches = 3.78 inches (Lets say 3.8 inches)
Converting 98mm to inches = 3.85 inches
Now let me ask you -- Can your eye tell me the difference between 3.8 and 3.85 inches on a tire mounted on a car
IT CANNOT (period)
Thats why they are virtually the same.
Now lets suppose you had gotten a 35 profile tire in the front
you would have to buy 245/35/19 -- Do the math again
245 * 35 / 100
85.75 mm
3.3 inches
Comparing 245/35/19 and 275/35/19 on your car
front in inches will be 3.30
Rear in inches will be 3.85
you will have a front tire that is half inch shorter than the rear tire (lol) A sharp eye can catch this very easily
You dont want that buddy!