Practice question

What is 'Regrooving' (Nachschneiden) of heavy commercial truck tires?

Deepening the tread grooves in the remaining tread base rubber on tires explicitly marked 'REGROOVABLE' by the manufacturer, strictly performed by trained professionals according to factory depth specifications
Carving new decorative artistic shapes on the tire sidewall
Retreading by applying hot liquid glue to bald tires
Drilling holes in the tire to reduce weight

Answer: A — Deepening the tread grooves in the remaining tread base rubber on tires explicitly marked 'REGROOVABLE' by the manufacturer, strictly performed by trained professionals according to factory depth specifications

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