Tire size question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Navy Chief MoonsSS · 05-09-2018, 07:08 PM

Hey fellas, I'm running 20x9 front and 20x10 rear zl1 replicas on my 2010 2SS. I have researched on here and seen a lot of good info, but not really gotten the straight forward answer. I am currently running stock sizes 245/45 front and 275/40 rear.

If I want to beef it up a bit without messing up the speedometer or anything else... what size would fit and accomplish this? Best I could find so far is 275/40 front and 315/35 rear... is this correct? Would it fit/work? Also saw some say 305/35 rear... pretty confused, because I don't want to have fitment or speedometer issues.

Any help is greatly appreciated!

Thanks!
-Ryan

00 Z/28 · 05-09-2018, 07:45 PM

275/40 matches to 315/35 and 285/35 better matches to 305/35. The goal is to keep the diameter of the all the tires as close as possible.

TheFlyingBananaSS · 05-09-2018, 08:32 PM

I have 9 and 10 inch rims. I found the perfect fit to be 275 and 305.
315 is too big for a 10 inch rim. The side walls will buldge too much.

Navy Chief MoonsSS · 05-09-2018, 08:39 PM

So someone showed me this calculator!

https://tiresize.com/comparison/

Now I understand better about matching the sizes on staggered setup...315/35 matches the 275/40 exactly!
Now the only question is will the 315/35 fit on the 20x10

Thanks guys!

CamaroFred · 05-09-2018, 08:52 PM

Compared to a 275/40X20:

245/45 is exactly the same diameter.

315/35 is exactly the same diameter.

The 305/35 is 1% smaller. A 265/40 is the same size as the 305/35.

285/35 is 3% smaller.

That said, there is some leeway in the manufacturers build vs. mathematics.
TireRack has charts that display the exact diameters and rotations/mile for various brands.

CamaroFred · 05-09-2018, 08:55 PM

Quote:

Originally Posted by Navy Chief MoonsSS

So someone showed me this calculator!

https://tiresize.com/comparison/

Now I understand better about matching the sizes on staggered setup...315/35 matches the 275/40 exactly!
Now the only question is will the 315/35 fit on the 20x10

Thanks guys!

The minimum wheel width for a 315/35 is 10.5".
305/35 can fit a 10"

05-09-2018, 07:08 PM	#1
Navy Chief MoonsSS Drives: 2010 2SS LS3 Join Date: Jun 2016 Location: Active Duty Military Posts: 54	Tire size question Hey fellas, I'm running 20x9 front and 20x10 rear zl1 replicas on my 2010 2SS. I have researched on here and seen a lot of good info, but not really gotten the straight forward answer. I am currently running stock sizes 245/45 front and 275/40 rear. If I want to beef it up a bit without messing up the speedometer or anything else... what size would fit and accomplish this? Best I could find so far is 275/40 front and 315/35 rear... is this correct? Would it fit/work? Also saw some say 305/35 rear... pretty confused, because I don't want to have fitment or speedometer issues. Any help is greatly appreciated! Thanks! -Ryan __________________ LT headers (SW 1 7/8 with high flow cats), Borla ATAK cat back exhaust CAM (BTR stage 3 blower cam with all supporting mods Lifters, push rods, springs, head bolts, LS2 Timing chain, sprocket, Melling high performance oil pump, gaskets SC (SLP TVS2300), Black wing CAI (designed for SLP SC) JRE super tensioner Fuel system (ZL1pump/ADM control module/ID850 injectors) wheels/tires NGK TR7IX plugs MSD wires ZR1 3 bar map sensor 160° thermostat Crank pin kit

05-09-2018, 07:45 PM	#2
00 Z/28 Drives: 2011 Camaro SS/RS Join Date: Jun 2016 Location: Atlanta, GA Posts: 182	275/40 matches to 315/35 and 285/35 better matches to 305/35. The goal is to keep the diameter of the all the tires as close as possible. __________________ 2011 SIM 2SS/RS L99/A6, Rotofab CAI, TSP LTs & hi-flows, SW Retro catback, BMR & Hotchkis goodies, MRR 017s & Nitto 555G2s

05-09-2018, 08:32 PM	#3
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	I have 9 and 10 inch rims. I found the perfect fit to be 275 and 305. 315 is too big for a 10 inch rim. The side walls will buldge too much. __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.

05-09-2018, 08:39 PM	#4
Navy Chief MoonsSS Drives: 2010 2SS LS3 Join Date: Jun 2016 Location: Active Duty Military Posts: 54	So someone showed me this calculator! https://tiresize.com/comparison/ Now I understand better about matching the sizes on staggered setup...315/35 matches the 275/40 exactly! Now the only question is will the 315/35 fit on the 20x10 Thanks guys! __________________ LT headers (SW 1 7/8 with high flow cats), Borla ATAK cat back exhaust CAM (BTR stage 3 blower cam with all supporting mods Lifters, push rods, springs, head bolts, LS2 Timing chain, sprocket, Melling high performance oil pump, gaskets SC (SLP TVS2300), Black wing CAI (designed for SLP SC) JRE super tensioner Fuel system (ZL1pump/ADM control module/ID850 injectors) wheels/tires NGK TR7IX plugs MSD wires ZR1 3 bar map sensor 160° thermostat Crank pin kit

05-09-2018, 08:52 PM	#5
CamaroFred Drives: Miss Con Ception Join Date: Aug 2016 Location: Chicagoland Posts: 2,998	Compared to a 275/40X20: 245/45 is exactly the same diameter. 315/35 is exactly the same diameter. The 305/35 is 1% smaller. A 265/40 is the same size as the 305/35. 285/35 is 3% smaller. That said, there is some leeway in the manufacturers build vs. mathematics. TireRack has charts that display the exact diameters and rotations/mile for various brands. __________________ 2011 1SS/RS LS3 CGM