Tyre Rolling Resistances Proposed changes in the EU

Tyre Rolling Resistances – Proposed changes in the EU and their effects Bill Coleman IWG WLTP 26 Zagreb April 2019

Current Legislation Ø GTR 15 Ø EU 2017/1151

Proposed EU Regulation to replace 1222/2009 (Tyre Labelling) Ø As tyres are becoming increasingly available in the label band A, there is a demand to differentiate these tyres and also avoid classes such as A+, A++ etc. Ø It is therefore proposed to lower the upper limit of band A, create a new band B and rename the existing B and C to be C and D (there is currently no band D)

Possible necessary amendments Ø Despite GTR 15 not mentioning the labelling letters, it should be kept technically alligned to EU legislation Ø This would require defining a new band (band 0? ) and setting a lower RRC limit for the existing band 1 Ø The new band would require a „mid point“ to be used for the calculation of cycle energies and thus CO 2 values Ø The „mid point“ of band 1 may be „corrected“ but this would cause confusion which may be considered undue

Possible necessary amendments (GTR) Energy efficiency class Range of RRC for C 1 tyres Range of RRC for C 2 tyres Range of RRC for C 3 tyres 0 1 2 3 4 5 6 RRC ≤ 5. 4 < RRC ≤ 6. 5 < RRC ≤ 7. 7 < RRC ≤ 9. 0 < RRC ≤ 10. 5 < RRC ≤ 12. 0 RRC > 12. 0 RRC ≤ 4. 4 < RRC ≤ 5. 5 < RRC ≤ 6. 7 < RRC ≤ 8. 0 < RRC ≤ 9. 2 < RRC ≤ 10. 5 RRC > 10. 5 RRC ≤ 3. 1 < RRC ≤ 4. 0 < RRC ≤ 5. 0 < RRC ≤ 6. 0 < RRC ≤ 7. 0 < RRC ≤ 8. 0 RRC > 8. 0 Energy Value of RRC to be used for efficiency class interpolation for C 1 tyres Value of RRC to be used for interpolation for C 2 tyres interpolation for C 3 tyres 0 1 2 3 4 5 6 RRC = 4. 9 RRC = 5. 9 [6. 0] RRC = 7. 1 RRC = 8. 4 RRC = 9. 8 RRC = 11. 3 RRC = 12. 9 RRC = 3. 9 RRC = 4. 9 [5. 0] RRC = 6. 1 RRC = 7. 4 RRC = 8. 6 RRC = 9. 9 RRC = 11. 2 RRC = 2. 7 RRC = 3. 5 [3. 6] RRC = 4. 5 RRC = 5. 5 RRC = 6. 5 RRC = 7. 5 RRC = 8. 5