Schwalbe city jet bike tyre k guardthe schwalbe city jet bike tyre with k guard is the perfect semi slick budget tyre for commuting and city riding features k guard 50 epi 26 sbc schwalbe basic compoundtechnologieslevel 3 k guard this guard has been proven for many years it consists of natural rubber and is reinforced with kevlar fibres together with the 50 epi carcass all active line tires are well protected against punctures kevlar is a trademark of dupont active line the basis fo