(1) 5.4% save in fuel consumption: internal study carried out at the Michelin test tracks in Ladoux (France) on 5 May 2021, under DEKRA supervision (report No. 21CPAEXT-030). For the comparison between new tyres and regrooved tyres (R5 mm), two identical Volvo FH500 trucks were used, fitted with 315/70 R 22.5 MICHELIN X® Line Energy™ Z2 & D2 tyres and each towing a fully loaded (40 tonnes) Schmitz Cargobull trailer fitted with 385/55 R 22.5 MICHELIN X® Line Energy™ T tyres at identical pressures (8.5 b, 7.5 b and 9.0 b). Results may vary depending on weather conditions, road type, tyre size and driving style.
(2) Compared to a worn non-regrooved MICHELIN tyre. Information based on the recommendations made by the French tyre manufacturers’ federation (TNPF) in 2019, according to which the regrooving of worn tyres increases tyre life by using all the available rubber.
(3) On wet ground, regrooved tyres offer approx. 10% greater transverse grip and traction compared to the same worn tyres. Internal study carried out by Michelin on a polished concrete track at Ladoux (France) in 2010; results may vary depending on the actual conditions of use.
(4) The CO2 savings from the Michelin multi-life model, are accentuated thanks to the fuel savings linked to regrooving (up to 5.4%(1)). According to a study under real conditions of use (using 315/70 R 22.5 tyres fitted to the drive and steering axles of a 4x2 truck used for international and national long distance, that have exceeded 50% wear), the average mileage for MICHELIN X® Line Energy™ Z2 and MICHELIN X® Line Energy™ D2 tyres is 232,200 km before regrooving* (*Michelin internal source and calculation, based on measurements taken by the Michelin teams during customer inspections on 488 axles, in Austria, Belgium, Croatia, the Czech Republic, France, Germany, Greece, Hungary, Italy, the Netherlands, Poland, Portugal, Romania, Serbia, Slovenia, Spain, and Turkey, over the period from 2020 to 2023), with a simulation based on the results collected suggesting extrapolation of the lifespan until 3 mm remains. The results may vary depending on the weather and road conditions. The view is that our tyres travel up to 25% (2) further thanks to regrooving, i.e. 58,050 km (232,200 x 25%). The fuel savings are calculated over the distance travelled by the regrooved tyres (58,050 km) at an average consumption of 29.5 L/100 km for new tyres and 27.91 L/100 km for regrooved tyres (source: DEKRA report No. 21CPAEXT-030). 29.5 x 5.4%, i.e., a saving of 1.59 L/100 km for an articulated truck and tri-axle trailer (thus 12 tyres) Consequently, there is a saving of 0.13 L/100 km per tyre (1.59 L/12), i.e., 0.13 L x 58,050 km/100 = 77 litres of fuel saved when driving on regrooved tyres, thus a saving of 77 litres of diesel x 3.24 kg of CO2 = 251 kg of CO2. The emissions factor of 3.24 kg of CO2 for 1 litre of diesel comes from the life cycle assessment conducted by ADEME for pure diesel. It includes emissions during the diesel production stages (17%) and during its combustion (83%). Source: ADEME. Base Empreinte, Étude Carbone, Version 22.0.0, 02/08/2022. Thus 77 x 3.24 kg of CO2 = 251 kg of CO2.
(5) The tread compound and pattern of MICHELIN Remix® tyres are largely the same as those used for new MICHELIN tyres. 90% of the MICHELIN Remix® tyre range is manufactured using the same mould and the same materials as new MICHELIN tyres and therefore perform equally well. According to internal tests conducted by the Michelin Research and Technology centre and customer testimonials collected in Europe since 2015.
(6) The CO2 savings from the Michelin multi-life model are also accentuated by the raw material savings linked to retreading. In terms of material savings, the average weight of a new MICHELIN tyre is 70 kg*. The weight of a tyre ready to be retreaded weighs 50 kg** on average. The CO2 impact from a retreaded tyre is linked to the material savings, i.e. 50 kg of raw materials saved, or 115 kg of CO2 at a rate of 2.3 kg of CO2*** per kg of raw materials.
*Internal study based on the MICHELIN truck tyre sizes most sold on the European market: 315/80 R 22.5, 315/70 R 22.5 and 385/65 R 22.5.
**According to a TNPF publication from 2023: “retreading, which, by reusing the casing that represents approximately 70% of a tyre’s weight” (sic). As a result, 70% of 70 kg = approximately 50 kg.
***The emissions factor of 2.3 kg of CO2 for 1 kg of tyre comes from the life cycle assessment calculations for the cradle to gate production of a tyre, conducted internally by Michelin using the calculation rules developed by the tyre manufacturing profession (via the global body, the Tire Industry Project (TIP), which brings 10 tyre manufacturers together around sustainable development themes). It includes the extraction of raw materials, transportation, manufacturing, and distribution stages. Source: UL Environment Standard, «Product Category Rules for preparing an Environmental Product Declaration for the product category: Tires», v3.05, February 2022. Thus 50 x 2.3 = 115 kg of CO2.

*Retread acceptance rate by brand, for all casings presented for a first retread in 2024 in all our plants in Europe (excluding Services and Solutions casings).

The retread acceptance rate is the ratio between the number of casings presented and the number of retreaded truck tyres produced from these casings (including initial inspection waste, production waste and final inspection waste) ==> total of 1,149,373 casings.