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The Topeak Tri-Backup Tube Bag is a compact storage bag for holding your spare tube on the clever Tri-Backup Pro mounting system (sold separately). Designed to integrate with Tri-BackUp Pro V and Tri-BackUp Pro I for maximum aerodynamic efficiency (sold separately).420D nylon constructionHolds 1 inner tube up to 700x25c70gMount: Works w/ TRI-Backup Pro V / Pro I/ Saddle railsRound Tube Diameter: Fits ø23 - ø48 mmSize: 12.2 x 6.8 x 4.4 cm / 4.8 x 2.7 x 1.7