Looks like a lot of metal, but actually this assembly's pretty light.
Jim's home | HPV home | This bike's home
This assemply will support the rear of the seat. Since the seat slides on the top tube, the strut must tilt forward and backward and extend and retract, and it needs some strength to stop if from twisting laterally.
Looks like a lot of metal, but actually this assembly's pretty light.
From another angle.
The strut cleaned some and attached to the top tube. I positioned the pivot bolt to serve as an axle for the chain idler. My goal was to keep the chain as close to the pivot point of the rear swingarm to reduce "pogo-ing" while pedalling. The chain will run under the idler and be enclosed in plastic tubing from this point forward.
Here's the telescoping part before brazing that will attach to the seat crossbar.