UNISTAR friction tyres 255/50 R21

XL XL (Extra Load) XL (Extra Load) — reinforced for ~11% higher load than standard. 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. D 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. 3PMSF (Snow grip) 3PMSF — certified winter marking. Tire passed EU tests in deep snow. Read more → M+S M+S (Mud & Snow) M+S (Mud & Snow) — for light snow and mud. Not certified; weaker than 3PMSF. Read more →