They don’t exactly share the 20” rims / tires
LT1: 20 x 8.5-in. aluminum (front & rear)
SS: 20-in. x 8.5-in. aluminum (front)^
SS: 20-in. x 9.5-in. aluminum (rear)^
LT1: P245/40R20 all-season (front & rear)
SS: P245/40R20 Goodyear Eagle F1 Asymmetric 3 summer-only run-flat (front)^
SS: P275/35R20 Goodyear Eagle F1 Asymmetric 3 summer-only run-flat (rear)^
https://media.chevrolet.com/media/us...2020.tab1.html