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Discussion Starter #1
My 2014 C7 is getting some custom +1 rims (19 & 20s) and I've decided to stick with the best rubber I know of, the Super Sport ZPs . My question is this. If you look at the tire sizes that are standard for the C7 vs Z51, you see that the side wall height basically is shorter on the z51 vs the Std. I assume this is a compromise to allow for the larger wheel size in the fender well. Note that the middle number is a percentage of the width of the tire and the widths on both cars is the same. (Std Coupe = P245/40ZR18 & P285/35ZR19) (Z51= P245/35ZR19 & P285/30ZR20)

1) Has anyone considered or actually put larger ZPs on their C7 ? i.e. P245/40ZR19 & P285/35ZR20 ? These would have slightly larger side walls. It seems to me these would easily fit in the wheel well, would not compromise performance as its the same basic ratios as on the Std Coupe, and will allow for a bit better ride and stance.

2) I've heard that the TPMS's used when mounting new tires/wheels should be GM OEM. I found Part#13581560 which can manually "learn" their location on the car etc... Do I have the correct part number? I've heard there are several that do not work properly, and then some that auto learn which sounds ideal.

I'm grateful for your insight in advance!
 

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the "self calibrate" tpms and nut/post:

nuts: 13581557
tpms: 19119416
 

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Those tires would be 1" taller than stock, at 60mph on the speedo you would be going roughly 63 actual. If the taller tires don't rub you could use them I suppose, either way the zp tires have stiff sidewall and I doubt you could tell much difference.

Btw the stock 18/19 and 19/20 tires are almost identical in tire diameter and do not throw off the speedo. Google a tire height comparison or calculator to compare tire sizes and heights if you are considering different sizes comparable to stock.

I went from a 245/40/18(front) to a 255/35/19 and 295/30/20 and even at 80mph it is less than 1mph off.

You should consider wider tires, the sidewall height will also slightly increase because it's a percent like you said.

Good luck! Post pictures of the new wheels when you get them :)
 

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I got 265/30/20s in the front and 305/30/20s in he rear with Luxury XO Verona wheels and Michelin PSS (non run flats). Car is also lowered on the stock bolts. No problems/no rub!
 

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20s all around!
 
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