285's vs 275's

bigrob126 · 05-18-2012, 11:21 AM

I got my conti DW's yesterday and went with the 285's in back. It almost looks like these 285 conti's seem narrower, or should i say no wider looking than the Bridgestone 275's I had on there

Kind of a drag, cause I was hoping for a wider look. Got em at Discount Tire, and as always......I checked the pressure this morning and 2 tires were at 33.3 lbs, one was at 35.4, and one was exactly 35! Amazes me how these guys cant get a simple thing like tire pressure right even when the tires are cold and just filled!

Anyway the tires seem to be nice, although with the pressure spot on now, I will get a better feel today!

tjlazer · 05-18-2012, 11:44 AM

They are wider, but not by much.

Do the numbers here:

http://www.discounttire.com/dtcs/infoTireMath.dos

bdavis89 · 05-18-2012, 11:47 AM

If I'm not mistaken the 275 and 285 are millimeters? So its literally only one centimeter wider...

tjlazer · 05-18-2012, 11:58 AM

Quote:

Originally Posted by bdavis89

If I'm not mistaken the 275 and 285 are millimeters? So its literally only one centimeter wider...

No the 285 is just a little less than an half inch wider than a 275 with a 35% sidewall.

See here:

http://www.tirerack.com/tires/tirete....jsp?techid=46

bdavis89 · 05-18-2012, 01:13 PM

Quote:

Originally Posted by tjlazer

No the 285 is just a little less than an half inch wider than a 275 with a 35% sidewall.

See here:

Tire Tech Information - Tire Size Guide

From the above link:

"Section Width

Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's "Section Width" (cross section) in millimeters.

P225/50R16 91S

The 225 indicates this tire is 225 millimeters across from the widest point of its outer sidewall to the widest point of its inner sidewall when mounted and measured on a specified width wheel. This measurement is also referred to as the tire's section width."

Therefore, 285mm - 275mm = 10mm = 1cm = 0.4in = just a little less than half an inch wider. Right? Or am I missing something?

tjlazer · 05-18-2012, 01:17 PM

Quote:

Originally Posted by bdavis89

From the above link:

"Section Width

Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's "Section Width" (cross section) in millimeters.

P225/50R16 91S

The 225 indicates this tire is 225 millimeters across from the widest point of its outer sidewall to the widest point of its inner sidewall when mounted and measured on a specified width wheel. This measurement is also referred to as the tire's section width."

Therefore, 285mm - 275mm = 10mm = 1cm = 0.4in = just a little less than half an inch wider. Right? Or am I missing something?

Correct. About half an inch wider with a 285 tire but the diameter will also be a little larger as well! (0.27") Assuming 35 series tire.

But that is fine, as the Nismo comes with this size tire and it's perfectly fine.

bdavis89 · 05-18-2012, 01:22 PM

Quote:

Originally Posted by tjlazer

Correct. About half an inch wider with a 285 tire but the diameter will also be a little larger as well! (0.27") Assuming 35 series tire.

Ah, so the diameter will be slightly larger because the fit on the wheel will really be about the same, causing the tire to bubble slightly?

bigrob126 · 05-18-2012, 02:53 PM

I guess the width diff is minimal. They look good but wanted more

tjlazer · 05-18-2012, 04:13 PM

Your actually better off getting 305's as they are closer in diameter to 275's!

Well -0.38 smaller anyways. lol

Staggered357 · 05-18-2012, 04:52 PM

1010tires.com has a wheel calculator that will give you a bunch of useful info...

I unused to run a 275/30/20 on a 20x10 on my 2008 max with a 41+ offset... Fenders rolled and she used to sit nice...

Chan Chee Hoe · 05-20-2012, 09:19 AM

How much heavier are the 285 compare to the 275.?I heard it will 'blunt' the performance of our cars.

Compdoc777 · 07-19-2012, 10:11 PM

Can I run the 275 on the Nismo instead of the 285?

I am trading my sport for a Nismo, but I want to keep my new r-spec yokohama tires.

KaienZ34 · 07-19-2012, 10:19 PM

10mm's

TheGreatOne · 07-19-2012, 11:21 PM

I was thinking of doing the same when it came time to change my tires. I guess atleast a 295 is needed to really "notice"

If I get 3 piece Forged wheels as planned I guess thats when I'll go 305 in back sine the rimes will probably be 11" in back

bmarcinczyk14 · 02-27-2013, 01:36 PM

Quote:

Originally Posted by tjlazer

Your actually better off getting 305's as they are closer in diameter to 275's!

Well -0.38 smaller anyways. lol

The 305's are not closer in diameter to stock..... The 285's are only .27" bigger than stock.

285/35-R19 vs 275/35-R19 Tire Comparison - Tire Size Calculator

05-18-2012, 11:21 AM	#1 (permalink)
bigrob126 Base Member Join Date: Jan 2011 Location: Las Vegas NV Posts: 134 Drives: 2009 370Z Sport Auto Rep Power: 14	285's vs 275's I got my conti DW's yesterday and went with the 285's in back. It almost looks like these 285 conti's seem narrower, or should i say no wider looking than the Bridgestone 275's I had on there Kind of a drag, cause I was hoping for a wider look. Got em at Discount Tire, and as always......I checked the pressure this morning and 2 tires were at 33.3 lbs, one was at 35.4, and one was exactly 35! Amazes me how these guys cant get a simple thing like tire pressure right even when the tires are cold and just filled! Anyway the tires seem to be nice, although with the pressure spot on now, I will get a better feel today! __________________ Rob

05-18-2012, 11:44 AM	#2 (permalink)
tjlazer A True Z Fanatic Join Date: Dec 2009 Location: Tacoma Age: 53 Posts: 2,496 Drives: Z34, R35 Rep Power: 19	They are wider, but not by much. Do the numbers here: http://www.discounttire.com/dtcs/infoTireMath.dos __________________ 2009 370Z Monterey Blue,Nismo Conversion,RE-11's, K&N Typhoon intakes,Blue Kickplates,Homelink,FI 18" CBE,ERZ HFCs,Hotchkis sways, Swift Spec-R, EVO-R Highwing, UPREV Last edited by tjlazer; 05-18-2012 at 11:53 AM.

05-18-2012, 11:47 AM	#3 (permalink)
bdavis89 Track Member Join Date: Oct 2011 Location: Jacksonville FL Posts: 586 Drives: '10 370Z PW Auto Rep Power: 15	If I'm not mistaken the 275 and 285 are millimeters? So its literally only one centimeter wider... __________________ 2010 Pearl White Touring Sport Package \| Navigation \| 7 Speed Automatic

05-18-2012, 02:53 PM	#8 (permalink)
bigrob126 Base Member Join Date: Jan 2011 Location: Las Vegas NV Posts: 134 Drives: 2009 370Z Sport Auto Rep Power: 14	I guess the width diff is minimal. They look good but wanted more __________________ Rob

05-18-2012, 04:13 PM	#9 (permalink)
tjlazer A True Z Fanatic Join Date: Dec 2009 Location: Tacoma Age: 53 Posts: 2,496 Drives: Z34, R35 Rep Power: 19	Your actually better off getting 305's as they are closer in diameter to 275's! Well -0.38 smaller anyways. lol __________________ 2009 370Z Monterey Blue,Nismo Conversion,RE-11's, K&N Typhoon intakes,Blue Kickplates,Homelink,FI 18" CBE,ERZ HFCs,Hotchkis sways, Swift Spec-R, EVO-R Highwing, UPREV

05-18-2012, 04:52 PM	#10 (permalink)
Staggered357 Base Member Join Date: May 2012 Location: NY VA GA Posts: 149 Drives: Nissan Maxima 10 Rep Power: 13	1010tires.com has a wheel calculator that will give you a bunch of useful info... I unused to run a 275/30/20 on a 20x10 on my 2008 max with a 41+ offset... Fenders rolled and she used to sit nice...

05-20-2012, 09:19 AM	#11 (permalink)
Chan Chee Hoe Track Member Join Date: Mar 2009 Location: Singapore Posts: 861 Drives: 370z,Yellow,7sp A Rep Power: 17	How much heavier are the 285 compare to the 275.?I heard it will 'blunt' the performance of our cars.

07-19-2012, 10:11 PM	#12 (permalink)
Compdoc777 Enthusiast Member Join Date: Dec 2011 Location: Cypress Posts: 277 Drives: 2011 Nismo #4 MB Rep Power: 13	Can I run the 275 on the Nismo instead of the 285? I am trading my sport for a Nismo, but I want to keep my new r-spec yokohama tires.

07-19-2012, 10:19 PM	#13 (permalink)
KaienZ34 A True Z Fanatic Join Date: Oct 2009 Location: LA. not L.a. Posts: 21,652 Drives: Z34 Tour/Sport Rep Power: 178	10mm's __________________ *"These Violent Delights Have Violent Ends"* http://www.the370z.com/members/kaienz34-albums-z34.html

07-19-2012, 11:21 PM	#14 (permalink)
TheGreatOne A True Z Fanatic Join Date: Jan 2011 Location: Montreal, Canada Age: 46 Posts: 1,980 Drives: E60 BMW M5 Rep Power: 21	I was thinking of doing the same when it came time to change my tires. I guess atleast a 295 is needed to really "notice" If I get 3 piece Forged wheels as planned I guess thats when I'll go 305 in back sine the rimes will probably be 11" in back __________________ 2017 SUBARU STI 2008 E60 M5 - SOLD 2010 40th Anniversary 370Z - SOLD (and missing her)

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