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|
|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”.
Truck and Bus Tires
Limitsin dB (A)
Stage 1= S1
Stage 2= S2
|Severe Snow **||78||74|
|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)