No need to change the frame and freewheel. The special design of chain plate, bridge-type roller link is composed of height-uneven chain plates. YBN jumps off the traditional way of chain length adjusment from the past, by adjusting pair of links, avoiding the difficulty of wasting and difficult adjustment. 

Mack chain adopts the SCM alloy steel, pass the special DHA heat treatment, its intension power is up to 1300kgf, a lot of higher strength than general roller chain 850 kgf, totally accords with ISO and JIS industrial standard. 

The straight shape design of outside chain plate, offers the ability of Freestyle bicycle to use the roller chain to collide against any object, smooth-going instead of beating, have more comforable and safer assurance to ride persons who take advantage of it

• Reinforced top plate for more aggressive impact tiding
• Designed for BMX and Freestyle use
• MK918 W/Solid Pin 
• Unique design for BMX, Freestyle, Track & Trail
• Pin Power: 250kgf