Vittoria Terreno Graphene 2.0 Mix Terrain Gravel Tyre - 700x38 Black Size:700x38c they have 6 channels cut

they have 6 channels cut into the base of the stem which allows free flow of sealant and air

As an endurance athlete (your events typically last more than two hours) you need to take in between 80-120g of carbohydrate per hour

Seals porous tyres and bead/rim gaps

highly-absorbent microfibre thumb insert

including steel and UV-treated plastic

Vittoria Terreno Graphene 2.0 Mix Terrain Gravel Tyre - 700x38 Black Size:700x38c they have 6 channels cutFor mixed terrain conditions Open shoulder lugs for secure off camber traction Traditional tread profile for smooth transitions across a broad range of terrain Size: 700x38 Anthracite Black