MICHELIN summer tyres 325/30 R21

XL XL (Extra Load) XL (Extra Load) — reinforced for ~11% higher load than standard. Read more → N0 N0/N1/N2 (Porsche) N0/N1/N2 — Porsche homologation (number indicates iteration). Read more → RP RP (Rim Protector) RP (Rim Protector) — generic rim-guard marking. C Fuel efficiency (A–E) Rolling resistance class A (best) to E. Difference between classes — up to 9% in fuel consumption. B Wet grip (A–E) Wet braking distance. Class A — shortest, E — longest. The difference can reach 30%. B|73dB Noise level (dB) External rolling noise in decibels. Lower number means quieter tire. Silent Internal polyurethane foam lining reduces cabin noise by up to 9 dB.