Material: The Spike 33 Lock-On grips are constructed from Kraton rubber

How does it carry them: Top tube slides on and you use the included bungees to safely secure your bikes

which reduces the surface damage and gouging that the cogs can often cause on aluminium freehubs

plus they are available in a bunch of cool Mottled/Grunge anodized finishes

making the inevitable mishaps less (financially) painful

Tannus Armour Tyre Insert - 2.0-2.5 Inch - 24 Inch Images Uploaded - Ready for Review Material: The Spike 33 Lock-OnThe Tannus Armour Tyre Insert is the ideal solution if you are running tubes and want some bomber puncture protection as well as increased ride quality. Who's this item for: DH, Enduro, and Trail bike riders running tubes who are hard on tyres and get lots of flats! Tubes Tubeless: This system has been designed to be used with tubes. Tannus recommends these sized tubes with their inserts: 2. 0 2. 5" insert: 1. 75 2. 1 tube 2. 6 3. 0" insert: 2. 0" 2.