BBB BTI-21 - Tubo interno 20 x 1,75-2,125 (Presta) 33 mm
Air chamber wall-thickness of 0.87mm. Thick enough for extra puncture resistance and thin enough to spare you the extra weight. Presta valves are available in 33mm, 48mm, 60mm and 80mm. Schrader valves are available in 3mm and 40mm.