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02-26-2010, 01:49 PM
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#1
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Join Date: Oct 2009
Posts: 443
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285's all around?
I see that 275 40 17 is a popular size for all 4 tires on F-bodies. Also see some references to the 285 40 17 is used too.
Can the 285 40 17 be used on front without rubbing? Would be using zr1 style wheel.
I prefer the 285 over the 275 becasue it is closer to the 26" wheel diameter so the speedo is nearly correct.
__________________
1998 Firebird Coupe
Mods: 3.73 Gears, Eaton TrueTrac, PCM Tune, LS1 Aluminum Drive Shaft, Cold Air Intake, 180 Thermostat, Magnaflow Cat-Back Exhaust, Moog LCA busings.
My Firebird Projects : Click Here
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02-26-2010, 01:52 PM
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#2
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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285/40/17 has allowable rim width range of 9.5-11" . Not sure if that is an issue for you, thought I'd mention it.
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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02-26-2010, 04:11 PM
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#3
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Join Date: Jun 2007
Location: Arm pit of the world... NJ
Posts: 2,676
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What size are on it stock?
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John
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02-26-2010, 04:34 PM
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#4
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Join Date: Oct 2009
Posts: 443
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Quote:
Originally Posted by Featherburner
What size are on it stock?
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235 55 16 is the factory tire size on a base model coupe.
__________________
1998 Firebird Coupe
Mods: 3.73 Gears, Eaton TrueTrac, PCM Tune, LS1 Aluminum Drive Shaft, Cold Air Intake, 180 Thermostat, Magnaflow Cat-Back Exhaust, Moog LCA busings.
My Firebird Projects : Click Here
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02-26-2010, 05:14 PM
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#5
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Join Date: Feb 2009
Location: bridgewater
Posts: 868
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im pretty sure the 98-02 with the ls1's had 275-40-17's which would make 285-35-17 the plus size for them but im not sure if they'll fit
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Quote:
Originally Posted by BigAls87Z28
its an ongoing joke between the Geo Storm crew and the Sebring coupe team.
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bolt-ons and a bed n' breakfast
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02-26-2010, 05:55 PM
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#6
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Is 285/35/17 even a real size you can buy?
Mark, one minor tidbit to note. Most decent tire places probably have a 275/40/17 on the shelf. 285/40/17 not so much. As a daily driver this might be a consideration.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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02-26-2010, 06:18 PM
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#7
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Join Date: Feb 2009
Location: bridgewater
Posts: 868
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well the middle number is a percent of the tire width so if you make the tire wider without changing the height of the tire, the middle number changes, a general rule of thumb is for every ten the first number increases, you take 5 away from the middle number
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Quote:
Originally Posted by BigAls87Z28
its an ongoing joke between the Geo Storm crew and the Sebring coupe team.
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bolt-ons and a bed n' breakfast
Last edited by ib4200; 02-26-2010 at 06:19 PM.
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02-26-2010, 06:25 PM
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#8
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Join Date: Oct 2009
Posts: 443
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forget about 285 35 17, no one makes that size.
The size I read people using here is 285 40 17. Its nearly the same diameter as the 235 55 16. Maybe the ls1 has different pcm parameters for calculating speedo? Either the base model has an incorrect speedo, or the ls1 has an incorrect speedo, because 235 55 16 and 275 40 17 are about 1/2" difference in height.
__________________
1998 Firebird Coupe
Mods: 3.73 Gears, Eaton TrueTrac, PCM Tune, LS1 Aluminum Drive Shaft, Cold Air Intake, 180 Thermostat, Magnaflow Cat-Back Exhaust, Moog LCA busings.
My Firebird Projects : Click Here
Last edited by Mark42; 02-26-2010 at 06:26 PM.
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02-26-2010, 06:32 PM
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#9
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Yes, the PCM can be recalibrated for tire size. Plus some people don't care about an ~1% speedo difference.
ib4200 I understand the math, it just ain't a real tire! Plus IIRC you add 1 to the rim size (thus the 'plus 1' moniker). So a 275/40/17 and a 285/35/18 are very close. A 285/35/17 is 3/4" shorter than 275/40/17. Edit: 285/35/18 does exist. A 315/35R17 is very close in OD to a 275/40/17, which is why that is a popular 'plus 0' sizing.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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02-27-2010, 03:18 AM
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#10
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Join Date: Apr 2008
Location: Delran
Posts: 6,785
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the difference in overall diameter would be 8 mm's more, which is just shy of 1/3 of an inch.
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02-27-2010, 07:19 AM
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#11
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Join Date: Dec 2004
Location: Galloway, NJ
Posts: 3,964
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What type of rims are you looking to put these on?
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1996 Camaro C/S - 2/3 Corvette Engine
Quote:
Originally Posted by BigAls87Z28
Uh yeah, after they surprized buttsecks us at Pearl Harbor?
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02-27-2010, 10:01 AM
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#12
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Join Date: May 2008
Posts: 817
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285's will be fine all around. people run 315's in the front with no modification. they're recommended for a 9.5" or wider wheel, but the 285's going on my WS6 wheels are no wider than the 275 BFG DR's that are on them now so I'm not worried.
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|2000 Trans Am|T56 swap|Bolt Ons| Suspension|
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02-27-2010, 01:17 PM
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#13
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Join Date: May 2009
Location: branchvlle
Posts: 364
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what kinda rims you gettin for the bird mark??
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![](image.php?u=3817&type=sigpic&dateline=1560989750) 1994 Chevy camaro
Formerly known as red99bird
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02-27-2010, 09:20 PM
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#14
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Join Date: Oct 2009
Posts: 443
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Quote:
Originally Posted by red99bird
what kinda rims you gettin for the bird mark??
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Thinking of the ZR1 rims. They look close to the original rims on the bird.
__________________
1998 Firebird Coupe
Mods: 3.73 Gears, Eaton TrueTrac, PCM Tune, LS1 Aluminum Drive Shaft, Cold Air Intake, 180 Thermostat, Magnaflow Cat-Back Exhaust, Moog LCA busings.
My Firebird Projects : Click Here
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02-28-2010, 02:15 AM
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#15
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Join Date: Nov 2009
Posts: 201
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I have 295s at all four corners on mine and I will say that steering is a little harder with the big front tires.
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78 Trans Am--Pontiac 400-custom headers-pypes 2.5 X system-edelbrock intake and carb, pro comp roller rockers custom brackets-head work-custom sound system - recaro interior
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02-28-2010, 10:14 AM
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#16
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Hippy Mod, Bergermeister Meisterberger, Moderator
Join Date: Aug 2004
Location: Ewing
Posts: 6,213
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285's should be fine, I was thinking about switching to them as well. It might affect your gas mileage vs the 235 though with more tire hitting the ground for more rolling resistance. And wider tires are quite a bit worse in the winter.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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02-28-2010, 01:23 PM
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#17
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Join Date: May 2009
Location: branchvlle
Posts: 364
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Quote:
Originally Posted by Mark42
Thinking of the ZR1 rims. They look close to the original rims on the bird.
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those will look pretty damn good on the bird. i wana get some nice ones for the redbird.but the but bumper come first to be fixed.haha
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![](image.php?u=3817&type=sigpic&dateline=1560989750) 1994 Chevy camaro
Formerly known as red99bird
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03-01-2010, 08:55 AM
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#18
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Join Date: Aug 2005
Location: Blackwood, NJ
Posts: 2,295
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Quote:
Originally Posted by Mark42
Thinking of the ZR1 rims. They look close to the original rims on the bird.
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If you want to get some 17's that look like your stock wheels then Check out the 98-01 1/2 WS6 wheels. Also for a cheap way to cal your speedo SLP sells or use to sell a Speedo Recal box that hooks into your wiring harness. I picked up mine for 25.00 on LS1 tech for my V6. Every time I went from 3.23,3.73, and 4.10 all I needed to do was turn a nob on the box to cal my speedo.
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Jeff
2002 WS6 T/A.. M6..Built 383 TMR tune..461rwhp,458rwtq
2009 G8 GT. Bone stock 13.6@103.. Vararam Intake, GXP Axlebacks, LS2 FRC's
1998 Corvette Convertible, Vararam Intake+Power Duct, Fast 90/90, Ti Axleback..12.8@110
2003 Cobra Convertible 10th Anniversary
http://www.fquick.com/slow-v6
Local car cruise schedule..
http://www.cliffscalendar.com/
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03-01-2010, 10:35 AM
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#19
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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for what its worth, the wider front tires "track" significantly. you will feel the car get into the groove of the road and want to stay with it. as far as tire model, i loved my firestone firehawk wide ovals. great on dry or wet pavement, never had them in the snow though.
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03-01-2010, 11:55 AM
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#20
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Join Date: Dec 2004
Location: Galloway, NJ
Posts: 3,964
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as a fellow V6 owner that went with ZR1 Rep's, I have 275/315 on my car, you can feel the increase in rotational weight, in both acceleration, and braking. grip is nice untill you slip into the crown of the road where the semi's run lol. unless your seeing some kind of track time like auto-x or road racing, id suggest going 275 to free up a little rotational weight, and tire resistance. Also you havea larger tire selection with 275's.
__________________
1996 Camaro C/S - 2/3 Corvette Engine
Quote:
Originally Posted by BigAls87Z28
Uh yeah, after they surprized buttsecks us at Pearl Harbor?
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