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The standard "convention" that most people go with is 285/30/20 front, 305/30/20 rear with those aftermarket wheel sizes and offsets, very similar to the SS 1LE setup.
I wanted a bit more sidewall than that and less difference from stock SS MRC sizes, so I settled on 275/35/20 front and 315/30/20 rear, which works perfectly and looks killer with those steamroller style rears. Change from stock is only 3-4 revs per mile in the same direction, little to no impact on rake and stability under high load, and I've just finished a 1000-mile roadtrip with zero issues.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq
Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle Terminator cam | LT4 FS & injectors | TSP forged pistons & rods
JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune
1100 - 1/30/18 | 2000 - 1/31/18
3000 - 2/06/18 TPW 2/26/18
3400 - 2/19/18 | 3800 - 2/26/18
4300 - 2/27/18 | 4B00 - 3/01/18
4200 - 3/05/18 | 4800 - 3/14/18
5000 - 3/16/18 | 6000 - 3/19/18
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