Blacksnow Granite EBB MK2 Frameset (M)Granite EBB MK2 Frameset details There are many many 20 inch wheels bikes over the world, but with thin tire. As a result, they are fast but not as comfortable as wider tires. So we are thinking how about build one extremely comfortable 20 inch wheels bike, and up to 20" 2. 4 tires clearance can even support gravel riding. Now the dream has come true. Standard Granite comes with BSA 68 bottom bracket, and EBB version ( Eccentric Bottom Bracket ) is