Perhaps, rather than argue that seat stays are for profit or cosmetics, maybe we should look at the make up of a chassis and how it would be possible for a seat stay to change performance, lets look at a bare chassis with a seat fitted and where seat stays are positioned in relationship with the rear axle, Now if you look at the area between the seat and the axle with no seat stays fitted all of the load is supported by the chassis rails between the A supports of the seat and the rear axle hangers, there will be flex in this area, Now if we fit seat stays between the top of the bearing hangers and the top seat on the flat part next to the A seat mounting points we have triangulated this area, (I agree we have done so via fibreglass, but in its flat form in this direction it is incredibly strong)so we have added rigidity So if adding rigidity to the rear of your chassis can affect performance? the answer is simple -YES SEAT STAYS CAN MAKE A DIFFERENCE.
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