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Old 01-13-22, 01:06 PM
Erzulis Boat
3rd Grade Dropout
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Join Date: Oct 2005
Location: Santa Barbara Calif.
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Originally Posted by Drillium Dude View Post
After taking a detailed look at the rest of the bike, it seems the rider came up with a novel way of turning a rigid seatpost into a shock-absorbing one by removing the binder bolt and installing that V-shaped spring unit. If that makes sense; there doesn't seem to be any other reason for it.

Also like the brake reinforcing plate on the rear brake vice the front.

I used to race MTB in that era. That is the predecessor to the modern dropper post. The spring (under control-rider "weight") would limit the travel upwards. You popped the quick release, and your weight would push post down for descents, and then a re-lock. Once back on flat/climb, you would loosen QR, and allow seat to rise under control to the designated stop (spring limit).

As the brakes became more powerful, sometimes the reinforcing bridge became necessary on the rear as well. You could plainly see the seat stays flex (some frames) out under braking and get this horrible squeal.

ETA- Got beat on the explanation
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