Which wheels?
15s with 50 profile tyres?
16s with 45 profile tyres? They need media blasting and repainting.
Both set needs new tyres.
Just looked at the costs of tyres - 195/50 R15 vs 195/45 R16
Uniroyal Rainsport3 in both sizes - £36 for the 15s and £56 for the 16s!