Rear mudguard for mountain bicycles that is suitable for bicycles with 27.5“/29“ wheel and plus-sized bicycles with suspension forks, featuring TPR mud flaps and special design which ensures full coverage against dirt and debris. The mudguard is made from two-tone composite material and attaches to the bicycle via RingFix quick release system with two-joint adjustability, fitting (aero) seatposts with diameter from 25 to 57.3 mm. It also comes supplied with a seatpost protection sticker that can be pre-applied for protection of the finish.