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      01-17-2011, 09:56 AM   #1
smmmurf
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Has anybody successfully run 245/40R19?

I want to increase sidewall profile for street ride quality. I understand the decreased responsiveness and heavier weight. I want to keep 19's for looks. I don't want to go back to 18's but I find the ride too harsh on OEM 19's and PS2's.

Has anybody run this tire size on stock suspension?

Assuming the tires are 98Y XL (equiv. to rear load rating), any rubbing or other issues running these all around?

If it matters I will be either getting Hankook V12 Evo's or Continental DW's.

Thanks!!

Last edited by smmmurf; 01-17-2011 at 10:17 AM..
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      01-17-2011, 11:04 AM   #2
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I can't say whether the tire will fit or not. But I can tell you that increasing the sidewall by 5% will probably not increase ride quality by a noticeable amount. Also ride quality depends on the tire, not all tires have the same strength sidewalls, some are stiffer whereas others have less rigid sidewalls. So if you want any benefit from a 5% taller sidewall you probably want to stay with the same tire you are running now. Otherwise you may get a tire with a stiffer sidewall than what you're running now and that 5% would make no difference.

Hope that helps. Any tire pro's to chime in on this?
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      01-17-2011, 11:14 AM   #3
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Quote:
Originally Posted by UA View Post
I can't say whether the tire will fit or not. But I can tell you that increasing the sidewall by 5% will probably not increase ride quality by a noticeable amount. Also ride quality depends on the tire, not all tires have the same strength sidewalls, some are stiffer whereas others have less rigid sidewalls. So if you want any benefit from a 5% taller sidewall you probably want to stay with the same tire you are running now. Otherwise you may get a tire with a stiffer sidewall than what you're running now and that 5% would make no difference.

Hope that helps. Any tire pro's to chime in on this?
Actually, sidewall percentage is calculated off of the treadwidth. I.e., 35 profile is 35% of treadwidth. Therefore, it's actually a change from 3.4" to 3.9" on 245/35 vs. 245/40 which equals roughly a 13% change in sidewall height.

Also, I intend to go from PS2 to Hankook V12 Evo which has a softer sidewall than PS2 in the same profile/diamter.

Thanks for the input!
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      01-17-2011, 01:26 PM   #4
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Quote:
Originally Posted by smmmurf View Post
Actually, sidewall percentage is calculated off of the treadwidth. I.e., 35 profile is 35% of treadwidth. Therefore, it's actually a change from 3.4" to 3.9" on 245/35 vs. 245/40 which equals roughly a 13% change in sidewall height.

Also, I intend to go from PS2 to Hankook V12 Evo which has a softer sidewall than PS2 in the same profile/diamter.

Thanks for the input!
What I meant by the 5% is changing the sidewall profile by 5%. Therefore going from a 35% profile to a 40% profile on the same width tire.

Good luck.
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      01-17-2011, 04:23 PM   #5
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Quote:
Originally Posted by smmmurf View Post
I want to increase sidewall profile for street ride quality. I understand the decreased responsiveness and heavier weight. I want to keep 19's for looks. I don't want to go back to 18's but I find the ride too harsh on OEM 19's and PS2's.

Has anybody run this tire size on stock suspension?

Assuming the tires are 98Y XL (equiv. to rear load rating), any rubbing or other issues running these all around?

If it matters I will be either getting Hankook V12 Evo's or Continental DW's.
Not a direct answer to you question, but you may have the wrong car if that is your priority. I assume you have EDC and have it set to Comfort? What size are you proposing for the rear? I don't think even a 13% sidewall change will be significant. The tire selection is probably more so.
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Last edited by GregW / Oregon; 01-17-2011 at 04:30 PM..
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      01-17-2011, 06:23 PM   #6
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Quote:
Originally Posted by GregW / Oregon View Post
Not a direct answer to you question, but you may have the wrong car if that is your priority. I assume you have EDC and have it set to Comfort? What size are you proposing for the rear? I don't think even a 13% sidewall change will be significant. The tire selection is probably more so.
Yes, EDC on comfort. But not the right car just because I don't want a crappy ride on OEM 19's? Funny. Sure, the roads in Oregon are significantly better than those in California but that does not mean I have to give up my M cars- after all they ride perfectly on OEM 18's and PS2's (both my E46 and E90). The issue arises only on 19" wheels which I am trying to keep- but if it is not possible to resolve I'll sell the 19's and go back to 18's.

245/35R19 is a thinner/shorter tire than the 225/45R18's or 225/40R19's that came on our E46 M3's, on a significantly bigger car. I think 40 profile fronts would look fine. I'd put either 245/40R19, stock 265/35R19, or 275/35R19's on the rear.
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      01-18-2011, 07:38 AM   #7
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Cannot vouch for the fit of the 245/40R19. It seems that the front of the M3 has more space for wider tires than taller tires, and I think I remember that some who have gone taller got rubbing.

If any have run it successfully, please chime in with what you ran, what your wheel specs were, if you had to use camber changes or make any mods to fit, and whether you ever have rubbing.

Smmmurf, if I were you, I would go back to the 18's. You know they fit, the ride worked well for you, and they are the 'right' size.

For those interested in the exact diameters involved:

225/40R19: 26" (E46 size)
245/35R19: 25.7"
245/40R19: 26.7"

Rear E90 Sizes
265/35R19: 26.3"
275?35R19: 26.5"

Note that both of the likely rear sizes are slightly shorter than the 245/40R19. The 275 would probably look close enough that it would look like about the same height.
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      01-18-2011, 11:35 AM   #8
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Quote:
Originally Posted by ben@tirerack View Post
Cannot vouch for the fit of the 245/40R19. It seems that the front of the M3 has more space for wider tires than taller tires, and I think I remember that some who have gone taller got rubbing.

If any have run it successfully, please chime in with what you ran, what your wheel specs were, if you had to use camber changes or make any mods to fit, and whether you ever have rubbing.

Smmmurf, if I were you, I would go back to the 18's. You know they fit, the ride worked well for you, and they are the 'right' size.

For those interested in the exact diameters involved:

225/40R19: 26" (E46 size)
245/35R19: 25.7"
245/40R19: 26.7"

Rear E90 Sizes
265/35R19: 26.3"
275?35R19: 26.5"

Note that both of the likely rear sizes are slightly shorter than the 245/40R19. The 275 would probably look close enough that it would look like about the same height.
Yup, it's either going back to 18's or going 245 or 255 front 275 rear 35 profile Hankook Ventus V12 which I got from you guys for my father's SL500 (which made the car ride MUCH better than the Michelin PS A/S that were on there before).

Thanks for the input, I would really like to know if someone has run a taller tire.
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      01-18-2011, 06:24 PM   #9
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Quote:
Originally Posted by smmmurf View Post
Actually, sidewall percentage is calculated off of the treadwidth. I.e., 35 profile is 35% of treadwidth. Therefore, it's actually a change from 3.4" to 3.9" on 245/35 vs. 245/40 which equals roughly a 13% change in sidewall height.

Also, I intend to go from PS2 to Hankook V12 Evo which has a softer sidewall than PS2 in the same profile/diamter.

Thanks for the input!
My bet is you will be much happier with ride quality by moving to the Hankooks. I was very happy with the ride with mine (19") and when I put my Michelin PA3s on for winter (and they are 18") I noticed a big drop in ride quality. Not that it's bad, just harsher and that is going from 19" to 18".

If it were me, I would stay with stock 19" size and the Hankook's and I bet you will be happy.
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      01-18-2011, 06:49 PM   #10
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Quote:
Originally Posted by gthal View Post
My bet is you will be much happier with ride quality by moving to the Hankooks. I was very happy with the ride with mine (19") and when I put my Michelin PA3s on for winter (and they are 18") I noticed a big drop in ride quality. Not that it's bad, just harsher and that is going from 19" to 18".

If it were me, I would stay with stock 19" size and the Hankook's and I bet you will be happy.
Hmm, very good points. Perhaps it's just the PS2's that ride harsh (they do handle very well though in both diameters 18" and 19"!). Would you recommend 255F/275R or 245F/275R since they do not have 265/35 in 19" diameter? Thanks!
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      01-20-2011, 10:38 AM   #11
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with regard to front vs rear sizing, it is a question of handling balance. Going up one size on the rear will, all else being equal, increase understeer slightly. Would you notice it going only one size? Probably not in most cases, but maybe at the limits.

All else being equal, I would go 255 Front with 275 Rear, but 245/275 would not be bad.
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      01-20-2011, 10:59 AM   #12
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Quote:
Originally Posted by ben@tirerack View Post
with regard to front vs rear sizing, it is a question of handling balance. Going up one size on the rear will, all else being equal, increase understeer slightly. Would you notice it going only one size? Probably not in most cases, but maybe at the limits.

All else being equal, I would go 255 Front with 275 Rear, but 245/275 would not be bad.
Yup, thanks. I was thinking that putting a wider front would decrease steering response on a tire with an already weaker sidewall than the PS2. I'm more concerned about ride than balance... and wider tires tend to pick up more noise/rocks than thinner tires.

Ideally I'd drive this car with a square setup (I love loose or neutral cars), but the stock rims aren't sized properly for that. Hrmm.. I'd do 265 all around if that were even possible (or even 245/255).
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