You can see in the charts below, that the Karoq (Front Wheel Drive) has 225/40R19 tyres when the 19" option is specified.
For someone with a back problem, these are completely unsuitable.
Changing to 215/60R16 tyres fitted to 6Jx16 ET43 5/112 57.1 rims (this is a standard tyre and rim combination on the Karoq (front wheel drive) will make the ride a lot softer and more comfortable. Make sure you choose tyres with soft and flexible sidewalls to get the maximum improvement.
Skoda Karoq 2018 1.5TSI (Front Wheel Drive)
– Generation: NU7 [2017 .. 2022]
– Market: EUDM
– Power: 148 hp | 110 kW | 150 PS
– Engine: 1.5L, DADA, I4, Petrol
– Options: SE, SE L, Ambition, Executive, Style, SportLine, Premium
– Center Bore: 57.1 mm
– PCD: 5x112
– Wheel Fasteners: Lug bolts
– Wheel Tightening Torque: 140 Nm
– Thread Size: M14 x 1.5
– Trim Production: [2017 .. 2021]
Tire
Rim
215/60R16 95V
6Jx16 ET43
2.2
215/55R17 94V
7Jx17 ET45
2.2
215/50R18 92V
7Jx18 ET45
2.4
225/40R19 93W
8Jx19 ET45
2.4
235/40R19 96W
8Jx19 ET45
2.4
Skoda Karoq 2018 1.5TSI (Four Wheel Drive)
– Generation: NU7 [2017 .. 2022]
– Market: EUDM
– Power: 148 hp | 110 kW | 150 PS
– Engine: 1.5L, DADA, I4, Petrol
– Options: SE, SE L, Ambition, Executive, Style, Scout, SportLine
– Center Bore: 57.1 mm
– PCD: 5x112
– Wheel Fasteners: Lug bolts
– Wheel Tightening Torque: 140 Nm
– Thread Size: M14 x 1.5
– Trim Production: [2018 .. 2021]
Tire
Rim
225/55R17 97V
7Jx17 ET45
2.4
225/60R16 98V
6Jx16 ET43
2.3
225/50R18 95V
7Jx18 ET45
2.4
225/45R19 92W
8Jx19 ET45
2.4
https://www.wheel-size.com/size/skoda/karoq/2018/#trim-15tsi-eudm-148