Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,196
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Mentioned: 132 Post(s)
Tagged: 0 Thread(s)
Quoted: 1566 Post(s)
Any structural part such as a seatpost will have more-limited use as this kind of damage progresses.
At some point, a post like this one might only be suitable for lighter riders and with the saddle positioned relatively foreward, which further limits maximum stress.
The intended usage, whether over bumpy or smooth roads, for what number of miles, and being ridden at what level of speed (relative to road conditions) is what might complete the data set used to estimate (guess at) the post's usefulness.
I still ride a NR seatpost with visibly-reduced diameter above the seat lug on a 1970 Gitane Super Corsa, apparently the result from beach air corrosion in the vicinity of some long-since removed seat bag straps that perhaps retained moisture and salt.
The bike's frame has also not surprisingly had it's chromed stays and fork blades painted over, and, FWIW, I weigh about 155 and put only about 200 miles on the bike per year.