Can I run a higher aspect ratio on sport suspension?

N54Society · 08-14-2016, 10:59 PM

I'm really not good with tire numbers so I'm hoping you guys can help. I have the following setup on my car:

Alufelgen SF-71
F: 19x8.5 +35
R: 19x9.5 +35

I'm currently running 265/30/19 on the rear right now but I was wondering if I can fit a 265/35/19?

How about a 275/35/19? Would it rub on hard launches if I went this route? I'm on stock sport suspension. 2008 E92.

Thanks!

ethirtyultra · 08-15-2016, 02:02 AM

It's key to either match or be as close to the OE tire diameter as possible. Aspect ratio (sidewall) of the tires you listed are too tall and will rub. Taking into consideration the rear wheel spec, 265/30/19 or 275/30/19 would be the best option being that its closest to OE diameter. 275/30 is also the widest you could go without having to do any modification.

OE rear tire diameter: 25"
---
265/30/19: 25.3"
275/30/19: 25.5"
---
265/35/19: 26.3"
275/35/19: 26.6"

what size are your front tires?

Antetokounmpo · 08-15-2016, 07:12 AM

From personal experience, the tallest you can really go is about 25.7''. That's about .4 inches taller than stock.

AtlasM · 08-15-2016, 09:14 AM

If you're looking to get a little more height, a 275/30-19 rear tire in addition to being wider than 265/30-19 will also be a bit taller. Sidewalls in tire sizes are expressed as a percentage of the width. 265/30 tire means the sidewall is 30% of the 265 mm width, or 79.5 mm. Going to 275/30 the sidewall becomes 82.5 mm. Overall diameter would increase by a total of 6 mm. Not much, but something.

I have 275/30-19 Kumho PS91 on 19x9.5 +32 in the rear. I'm lowered and with -2 degrees negative camber I get the very slightest amount of rubbing on certain really huge bumps. Your wheels have 3 mm of additional fender clearance compared to me so that little difference could be all that's needed.

N54Society · 08-15-2016, 02:41 PM

Thanks guys! I think I'll play it safe and stick with the 30 for aspect ratio.

N54Society · 08-15-2016, 10:21 PM

Quote:

Originally Posted by ethirtyultra

It's key to either match or be as close to the OE tire diameter as possible. Aspect ratio (sidewall) of the tires you listed are too tall and will rub. Taking into consideration the rear wheel spec, 265/30/19 or 275/30/19 would be the best option being that its closest to OE diameter. 275/30 is also the widest you could go without having to do any modification.

OE rear tire diameter: 25"
---
265/30/19: 25.3"
275/30/19: 25.5"
---
265/35/19: 26.3"
275/35/19: 26.6"

what size are your front tires?

235/35/19

I'm going to stick with 265/30/19 I think.

Ruddigger · 08-16-2016, 11:19 AM

Is aspect ratio the proper term for this?

Antetokounmpo · 08-16-2016, 01:45 PM

Quote:

Originally Posted by Ruddigger

Is aspect ratio the proper term for this?

Yup. It's literally a ratio of the width that determines the sidewall height.

Ruddigger · 08-16-2016, 02:28 PM

Quote:

Originally Posted by Heel Toe

Yup. It's literally a ratio of the width that determines the sidewall height.

I knew that, just mever heard it referred to that way. Only in reference to TV's and monitors. lol. Learn something new every day.

ethirtyultra · 08-17-2016, 01:27 AM

Quote:

Originally Posted by Ruddigger

Is aspect ratio the proper term for this?

Quote:

Originally Posted by Heel Toe

Yup. It's literally a ratio of the width that determines the sidewall height.

ethirtyultra · 08-17-2016, 01:29 AM

Quote:

Originally Posted by vbp6us

235/35/19

I'm going to stick with 265/30/19 I think.

sweet! post pics once all is said and done

N54Society · 08-17-2016, 01:38 AM

Quote:

Originally Posted by ethirtyultra

sweet! post pics once all is said and done

Definitely. I had a change of heart and decided to go more economical for the following reasons. I don't think I'll gain any reasonable traction with the amount of power I'm making on a 19 inch rim. The sidewall is just not big enough. I may get rid of my 19s in the future and opt for 18s, at which point I'll be buying some really sticky tires.

I ended up buying two Nitto NT555 275/30/19 tires for $300 shipped. I figure installation is about $50 so at $350 it's still $250-300 cheaper than a "good" tire. I honestly don't race very often and never track the car but given my mods I make pretty good power so I thought it would be cool to be able to utilize it from a dig. Long story short, I got smart and decided to defer my "good" tire purchase for some time in the future when I have the correct rim size.

ethirtyultra · 08-17-2016, 01:49 AM

Quote:

Originally Posted by vbp6us

Definitely. I had a change of heart and decided to go more economical for the following reasons. I don't think I'll gain any reasonable traction with the amount of power I'm making on a 19 inch rim. The sidewall is just not big enough. I may get rid of my 19s in the future and opt for 18s, at which point I'll be buying some really sticky tires.

I ended up buying two Nitto NT555 275/30/19 tires for $300 shipped. I figure installation is about $50 so at $350 it's still $250-300 cheaper than a "good" tire. I honestly don't race very often and never track the car but given my mods I make pretty good power so I thought it would be cool to be able to utilize it from a dig. Long story short, I got smart and decided to defer my "good" tire purchase for some time in the future when I have the correct rim size.

Not bad at all. 275's are even better!

08-14-2016, 10:59 PM	#1
N54Society Major Private First Class 450 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	Can I run a higher aspect ratio on sport suspension? I'm really not good with tire numbers so I'm hoping you guys can help. I have the following setup on my car: Alufelgen SF-71 F: 19x8.5 +35 R: 19x9.5 +35 I'm currently running 265/30/19 on the rear right now but I was wondering if I can fit a 265/35/19? How about a 275/35/19? Would it rub on hard launches if I went this route? I'm on stock sport suspension. 2008 E92. Thanks! __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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08-15-2016, 02:02 AM	#2
ethirtyultra Member 15 Rep 46 Posts Drives: E30 Join Date: Jul 2016 Location: California iTrader: (0)	It's key to either match or be as close to the OE tire diameter as possible. Aspect ratio (sidewall) of the tires you listed are too tall and will rub. Taking into consideration the rear wheel spec, 265/30/19 or 275/30/19 would be the best option being that its closest to OE diameter. 275/30 is also the widest you could go without having to do any modification. *OE rear tire diameter: 25"* --- 265/30/19: 25.3" 275/30/19: 25.5" --- 265/35/19: 26.3" 275/35/19: 26.6" what size are your front tires? Last edited by ethirtyultra; 08-15-2016 at 04:27 AM..
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08-15-2016, 07:12 AM	#3
Antetokounmpo Brigadier General 1552 Rep 3,475 Posts Drives: E90 6MT FBO; '18 F150 Platinum Join Date: Jul 2013 Location: WI iTrader: (3) Garage List 2018 Ford F-150 Pla ... [0.00] 2008 BMW 335xi [0.00]	From personal experience, the tallest you can really go is about 25.7''. That's about .4 inches taller than stock. __________________ 2008 335xi 6MT \| VRSF Catless DP \| VRSF 7" FMIC \| VRSF CP \| TIAL BOV \| DCI \| MHD 2+ BC Racing BR \| Stoptech 600 \| Firehawk Indy 500 255 Square \| Atric Altimax 225 Sq. 2018 F-150 Platinum 701A \| FX4 \| 3.5 EcoBeast
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08-15-2016, 09:14 AM	#4
AtlasM Captain 285 Rep 615 Posts Drives: '11 E92 335xi 6MT Join Date: Jun 2013 Location: Rockville, MD iTrader: (0) Garage List 2011 BMW 335i xDrive [8.00]	If you're looking to get a little more height, a 275/30-19 rear tire in addition to being wider than 265/30-19 will also be a bit taller. Sidewalls in tire sizes are expressed as a percentage of the width. 265/30 tire means the sidewall is 30% of the 265 mm width, or 79.5 mm. Going to 275/30 the sidewall becomes 82.5 mm. Overall diameter would increase by a total of 6 mm. Not much, but something. I have 275/30-19 Kumho PS91 on 19x9.5 +32 in the rear. I'm lowered and with -2 degrees negative camber I get the very slightest amount of rubbing on certain really huge bumps. Your wheels have 3 mm of additional fender clearance compared to me so that little difference could be all that's needed.
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08-15-2016, 02:41 PM	#5
N54Society Major Private First Class 450 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	Thanks guys! I think I'll play it safe and stick with the 30 for aspect ratio. __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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08-16-2016, 11:19 AM	#7
Ruddigger Major 694 Rep 1,302 Posts Drives: 2012 E91 Join Date: Aug 2015 Location: SoCal iTrader: (0)	Is aspect ratio the proper term for this? __________________ My build thread. It's a wagon with stuff on it.
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