Fixes punctures before you even know you've got one! Inner tube pre-filled with puncture fixing gloop. Pull the thorn out and the gloop escapes.;When it contacts the air, it fills the hole. All you need to do is pump a bit more air in occasionally. A bit of extra weight but a lot less hassle.;You get 1 tube which will fit sizes 29 x 1.85-2.20. Presta valve.

• Slime Smart 29 x 1.85-2.20 PRESTA Valve Bicycle Self Healing Inner Tube

Slime Smart 29 x 1.85-2.20 PRESTA Valve Bicycle Self Healing Inner TubeSlime