20. The joint GRBP/GRPE Task Force on Tyre Abrasion (TF TA) reported on the results and challenges of the ongoing market assessment of different tyres for developing future limits for tyre abrasion based on the two adopted test methods, namely the outdoor road circuit method and the indoor drum method (GRBP-81-25). GRBP noted that a first document with the limits was expected at the next GRBP session in September. GRBP also updated the TF TA Terms of Reference (GRBP-81-24).