The 2020 Porsche Panamera tire size depends on trim: the 4 takes 265/45ZR19 (105Y) XL; the 4 E-Hybrid Executive takes 265/45ZR19 (105Y) XL; the 4 E-Hybrid Sport Turismo takes 265/45ZR19 (105Y) XL; the 4 E-Hybrid takes 265/45ZR19 (105Y) XL; the 4 Sport Turismo takes 265/45ZR19 (105Y) XL; the 4S takes 265/45ZR19 (105Y) XL; the GTS takes 275/40ZR20 (106Y) XL; the 4S Sport Turismo takes 265/45ZR19 (105Y) XL; the Turbo takes 275/40ZR20 (106Y) XL; the 4 Executive takes 265/45ZR19 (105Y) XL; the 4S Executive takes 265/45ZR19 (105Y) XL; the GTS Sport Turismo takes 275/40ZR20 (106Y) XL; the Base takes 265/45ZR19 (105Y) XL; the Turbo Executive takes 275/40ZR20 (106Y) XL; the Turbo S E-Hybrid takes 275/35ZR21 (103Y) XL; the Turbo S E-Hybrid Sport Turismo takes 275/35ZR21 (103Y) XL; the Turbo Sport Turismo takes 275/40ZR20 (106Y) XL; the Turbo S E-Hybrid Executive takes 275/35ZR21 (103Y) XL, per the factory service manual.
Factory-Spec Tire Size
Varies by trim
4: 265/45ZR19 (105Y) XL
4 E-Hybrid Executive: 265/45ZR19 (105Y) XL
4 E-Hybrid Sport Turismo: 265/45ZR19 (105Y) XL
4 E-Hybrid: 265/45ZR19 (105Y) XL
4 Sport Turismo: 265/45ZR19 (105Y) XL
4S: 265/45ZR19 (105Y) XL
GTS: 275/40ZR20 (106Y) XL
4S Sport Turismo: 265/45ZR19 (105Y) XL
Turbo: 275/40ZR20 (106Y) XL
4 Executive: 265/45ZR19 (105Y) XL
4S Executive: 265/45ZR19 (105Y) XL
GTS Sport Turismo: 275/40ZR20 (106Y) XL
Base: 265/45ZR19 (105Y) XL
Turbo Executive: 275/40ZR20 (106Y) XL
Turbo S E-Hybrid: 275/35ZR21 (103Y) XL
Turbo S E-Hybrid Sport Turismo: 275/35ZR21 (103Y) XL