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07-09-2018, 09:34 PM
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#1 |
    
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Issues running thinner tires on an SS?
Quick Correction: SMALLER tires, not thinner
Just got back from ordering some MP4Ss for the SS, and I ordered in the wrong aspect ratios--35r and 30r. Just had a brain fart when I told the guy the sizes... Would there be any cause for concern to throw them on? I know the 1LE and ZL1 run 30r tires. They're not mounted or paid for yet so I could reasonably call tomorrow and get that sorted out, but I looked prices on the correct ratios and these are a good bit cheaper than 40r/35r tires. Thoughts?
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1998 Bright Purple Metallic Camaro 2012 Carbon Flash Metallic 2SS Convertible 2016 Summit White 2SS Coupe M6, NPP, & MRC Now Driving: 2016 Torch Red Corvette 2LT, NPP, MRC |
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07-10-2018, 01:40 AM
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#2 |
    
Drives: 2SS 1LE Join Date: Oct 2011
Location: AK
Posts: 2,300
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I built a spreadsheet comparing all tire sizes from 225 through 325 or so for 19 and 20" rims, this way I could know how ride-height would be affected going to a different profile tire. I don't have enough information to know how much different yours would be from stock, such as what stock front and rear profiles are, widths, etc., but you can do this yourself. This way I was able to find alternate winter tires and wheels at 19" and 255 that were within 1/4" of the ride height of my summer setup.
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Everything happens for a reason, except when it doesn't, but even then, you can, in hindsight, fabricate a reason that satisfies your belief system.
2018 2SS 1LE 2023 Colorado ZR2 2022 Stinger GT-line AWD |
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07-10-2018, 03:30 AM
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#3 |
   
Drives: 2017 2SS M6 Join Date: Jun 2013
Location: WNY
Posts: 7,071
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correct you order
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real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1
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07-10-2018, 05:07 AM
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#4 |
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Drives: 2016 Camaro 2SS Join Date: Nov 2016
Location: North Jersey
Posts: 591
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Yeah I would get the correct size.
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07-10-2018, 06:02 AM
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#5 |
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Drives: 18 zl1 Join Date: Aug 2017
Location: central alabama
Posts: 935
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https://www.wheel-size.com/calc/?whe...30-20X10.0ET20
you can use that and input what you have vs what you'll be getting and it will tell you almost exactly what the differences will be |
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07-10-2018, 09:07 AM
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#6 | |
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corner barstool sitter
Drives: 08 Mustang GT, 19 WRX Join Date: Jul 2012
Location: Eastern Time Zone
Posts: 6,990
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Quote:
Your car would ride about half an inch lower and have about half an inch more top-of-tire to fender gap. Your car's speedometer/odometer would read about 4% different than before (faster speed and miles driven). I'm saying 'different' because there's no guarantee that with the OE tires those measurements were dead-nuts accurate. RPMs on the highway would probably be enough higher to notice right away, but would soon become the "new normal" in your driving. You might even like it better, kind of like swapping axle gears for the next deeper set. The only caution I can think of involves potholes and possibly curb strikes. With less sidewall comes a somewhat greater likelihood of pinch-flats. Just so you know, the tire set on the car pictured below is about 1.3" shorter than OE and another set I have for that car is 0.8" shorter than OE. I've done the same sort of thing with a car I no longer own. I wouldn't ever go back to full OE diameter tires after going shorter. Norm
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'08 GT coupe 5M (the occasional track toy)
'19 WRX 6M (the family sedan . . . seriously)  |
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07-15-2018, 08:02 PM
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#7 |
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Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016
Location: Ocean City, NJ
Posts: 3,175
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Norm has pointed out most of the issues.
You said smaller tires are cheaper. You will be logging more miles on your car than you actually drive. The smaller tires will also run hotter, so I expect tread wear/tire life to be affected. It may end up not netting the cost savings you initially realize. |
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07-15-2018, 09:51 PM
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#8 |
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Drives: 67 goat, 69 goat ram air III Join Date: Mar 2009
Location: South texas
Posts: 1,443
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Death awaits... really, correct order if you can if not you'll be ok...
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