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  1. #1

    Default 275/40-17 vs 305/45-17

    So i need new tires. Im looking into Mickey Thompson ET Street R bc i hear many good things about them. The car sees the track on occasion but i get there when i can.
    My mods include LE TFS 2.5 heads and 234/244 .597/.614, 4l80e, 3800 stall, 3.73s and 150 plus nitrous.
    So what would benefit me?
    I know the 305 tire is a 28 inch tall tire with more sidewall. The are recommended for 9.5 inch wheels, i have a buddy who runs them on 9 inch rims and cuts 1.4 60s.
    Im just lookingfor any experience with similar mods and tire diameters.
    Id be happy with 1.6
    thanks
    Last edited by anniversaryss; 05-31-2017 at 01:33 PM.

  2. #2
    Long Live the Opti


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    Don't know where you got the 28" tall part from, but calculated out the 275/40 comes in at 25.7" in diameter and the 305/35 comes in at 25.4" diameter. It's shorter. A 315/35-17 would be 25.7 also. If you're running a stock SS wheel that's a 17x9 (based off your screen name) the 315 would be a tough fit and bulge a LOT, the 275/40 is what was stock. I wouldn't run the 305 as it's shorter than stock.
    Quote Originally Posted by Ryan Stout View Post
    I would try to work my neck muscles but I'm not invited to the LS guy parties.

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    Just for reference, I am running Nitto Nt05r in 275/40-17 and cutting 1.6X 60ft's with completely stock ( cut coils for 1.5" drop) suspension with a cam and stall only full weight firebird

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  5. #4

    Default

    Quote Originally Posted by Fastbird View Post
    Don't know where you got the 28" tall part from, but calculated out the 275/40 comes in at 25.7" in diameter and the 305/35 comes in at 25.4" diameter. It's shorter. A 315/35-17 would be 25.7 also. If you're running a stock SS wheel that's a 17x9 (based off your screen name) the 315 would be a tough fit and bulge a LOT, the 275/40 is what was stock. I wouldn't run the 305 as it's shorter than stock.
    Sorry it was 305 45 17

  6. #5

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    Well i want to do stock tire size 275 40 17 if be happy with 1.6s. Obviously lower the better

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    Quote Originally Posted by anniversaryss View Post
    Well i want to do stock tire size 275 40 17 if be happy with 1.6s. Obviously lower the better
    Ive ran the mickeys and they are a great tire. It was a 6speed car so 60ft wasn't what it would be with a auto.

    like I said Im on the Nittos now and the only reason I went with them over the Mickeys was because I drive it on the street alot and they are MUCH better for daily driving (go slow if I get caught in the rain) I have NO wheel spin right now after a short burnout running 26psi with the Nt05rs, the only thing keeping me from a lower 60ft is power, Im sure I could get a 1.50 or even less with more power and suspension mods.
    I know you didnt ask about nittos but just throwing that out there.

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    Quote Originally Posted by Fastbird View Post
    Don't know where you got the 28" tall part from, but calculated out the 275/40 comes in at 25.7" in diameter and the 305/35 comes in at 25.4" diameter. It's shorter. A 315/35-17 would be 25.7 also. If you're running a stock SS wheel that's a 17x9 (based off your screen name) the 315 would be a tough fit and bulge a LOT, the 275/40 is what was stock. I wouldn't run the 305 as it's shorter than stock.
    I saw this on another forum. I think he meant 305/45-17, which is a M/T size, which their chart shows as 28.1"
    SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.

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    Lol, that 35 to 45 makes a little difference doesn't it?

    I've had both Mickey's and Nitto's (NT555R and NT05R). Only used on street, but the hardest hooking of the bunch have been the NT05R, followed by the Mickey ET Street Radial, then the NT555R. I don't think you'd really go wrong with either the Mickey or NT05R.
    Quote Originally Posted by Ryan Stout View Post
    I would try to work my neck muscles but I'm not invited to the LS guy parties.

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    What rear end are you guys using?

    Sent from my SM-G900V using Tapatalk

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    Stock 3.23 for me

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