Products for Transport



Rolling Resistance and Rolling Noise Limits for Truck and Bus Tires according to UN Regulation 117

  • UN regulation 117 was introduced in 2005 and amended to version 117.02 in 2011. In EU Member States and Norway it applies since 1 November 2011 (EC Regulation 661/2009).
  • The regulation (hereinafter called UN reg. 117) sets tire type approval limits for rolling resistance, sound and wet grip.
  • The limits and timings of introduction in Europe differ among tire classes (truck/ bus, light truck, passenger car), segments (replacement, original equipment).
  • NEW from 1 November 2017 for truck/ bus tires: OE tires for newly homologated vehicles must fulfill the R2 rolling resistance limit. This means roughly 20% lower rolling resistance than the previous R1 limit.
  • From 1 November 2020, OE tires for all vehicles entered into service must meet the R2 rolling resistance limit.
  • All new Continental developments (incl. winter tires) since 11/2016 already fulfill the new limits for OEM use.

In 2009, the EU decided to introduce type approval for noise, wet grip, and rolling resistance according to UN regulation 117. A new “big E4 number” was added to the tire sidewall to signify type approval for UN regulation 117 replacing the smaller e4-S numbers stepwise.

External Rolling Noise:      S1 or S2
Wet Grip:W*
Rolling Resistance:R1 or R2

* not mandatory in all cases

Every tire manufacturer must make sure that every tire sold in Europe and affiliated states falls within the sound and rolling resistance limit as defined in R117. Type Approval authorities issue the R117 certificate. This number will have to show on the tire’s sidewall including SxRx levels, e.g. as shown above “E4 023296 S2WR2”. See tables below for the stage 2 limits for truck and bus tires and for the introduction dates. All new Continental developments (incl. winter tires) after 11/2016 comply to “S2R2 / S2WR2”. 

Limits in dB for External Rolling Noise:

Truck and Bus Tires


in dB (A)


Stage 1

= S1


Stage 2

= S2
Normal Tires*7673
Severe Snow **7874
Special Use Tires
(i.e. Offroad Tires)
Traction Tires-+2 dB (A)

* Limit also applies to Tires marked with M+S

** Tires which have passed the snow test and bear the Alpine-Symbol (3PMSF)

Limits for Rolling Resistance* 

*Rolling Resistance is expressed by a Coefficient: The RRC is defined as RR force (N) divided by the tire load (kN).

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