1 ”and 7/8” Chain Stays
One of the real thrills of building a custom-made frame at Seven Cycles is the ability to freely control the tubes in various parts of the frame. For example, the drivetrain should be highly rigid while maintaining the comfort of the front triangle.
Many riders prefer standard 7/8 inch diameter chainstays. This is a tube that balances lightness and power transfer. Since the tire clearance can be wider than the 1-inch diameter stay, the rear center can be shortened accordingly.
On the other hand, a 1-inch diameter seat stay is an element that Seven needs to build a drivetrain with higher rigidity. The goal is to transfer the energy generated by the rider to the rear hub as a complete driving force. While increasing the outer diameter and reducing the wall thickness by that amount to suppress weight increase, as a result, the 1-inch seat stay has improved bending rigidity and torsional rigidity by 50% or more compared to 7/8 inch. For XX grade frames, this is butted to further reduce weight.
There is no harder drivetrain in the handmade bike market. And these1 inch chain stay and fast back dropoutCombined with a 12mm thru axle, drivetrain efficiency is pushed to the limit.