G 540 With its generous width, it takes hard knocks in its stride, even on bumpy tracks. Enjoy those long rides! This aluminium gravel rim is the ideal choice for tackling gravel, roots and small obstacles on unpaved forest trails. Tough and versatile, it suits a wide range of uses and delivers great comfort thanks to its 24 mm internal width and its knobbly tyres of up to 53 mm wide.