Simson chain tensioners With these Gazelle chain tensioners from Simspon you can easily tension your bicycle chain. This chain tensioner is especially suitable for Gazelle bicycles. These chain tensioners are attached to the axle of the rear wheel with the ring. Then place the bracket against the rear fork for easy and quick tensioning of the bicycle chain. Specifications: Color: silver, black Gender: unisex Material: steel, plastic Length of thread: 35 mm Thickness of thread: 6 mm Total length: 65 mm Weight: 15 grams Contents: 2 Pieces