Italian translation: grossi tasselli (di battistrada)
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English to Italian translations [PRO] Tech/Engineering - Other / BICICLETTE
English term or phrase:big tread bars
.... a bicycle designed for use on rough ground; it is fitted with an adequately strengthened frame and other components and , usually, broad tyres with big tread bars as well as a wide range of gears.
grandi scolpiture ????????