changing tire size

[hebedog19]

hey guys,  picking my brand new silverado 1500 this afternoon and cant wait! I'm currently running 265/70/r17 which is stock on the WT model.   I found a brand new pair on from another 2019 silverado RST model for a great deal that is 265/65/18.  seems very minor to me but will this affect my truck, void my warranty etc.....   i have the 3.42 rear axle and i believe the RST is 3.23.  only real major difference i can see.

 

thanks

Edited July 18, 2019 by hebedog19
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[Jsteegs]

https://tiresize.com/comparison/

 

input the tire sizes and it will tell you the differences. Might change the odometer readout a tad, but other than that nothing to worry about. 

[UGAreb]

FWIW, the stock tire size on my 2019 GMC 1500 SLT is 265/65R18, but the spare tire is 265/70R17