Stans Crest MK4 Rim - 26 Disc Black 32HStans NoTubes Crest MK4 Rim 26 Disc Black 32H. The Crest MK4 combines the heritage of Stans legendary tubeless design with todays best materials and a stronger asymmetric design. The BST Asymmetric rim design allows for a stronger wheel while offering the easy inflation and Stans trademark unmatched airtight seal. The Crest MK4 rim is optimized for 40mm Gravel tires and up to 2. 3 mountain tires making it a great versatile choice for a wide range of