French distributor Sifam has a direct replacement for the 4 mm heavy duty inner tubes used in off-road competition - Mastertube is a 4.5 mm specialty inner tube. Its reinforced and grooved structure is said to give it "perfect homogeneity" when pressurised. The 4.5 mm section provides increased resistance in extreme conditions while maintaining comfort and simple mounting.
Available in 21", 19" and 18", their white valve cap makes them distinctive, which, in addition to a "recognisable and unique aesthetic", incorporate a valve core tool - simple but effective.
SIFAM
www.sifam.fr
