Seatpost Size Conundrum
- Thread starter Reynard
- Start date
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OP
OP
Reynard
Guru
- Location
- Cambridgeshire, UK
The calipers were borrowed, so can't measure the diameter of the seatpost right now... 
But it's been bugging me all afternoon (I was out, and you know how things just simmer in the back of your mind) so I went and had another look.
I opened out the top of the seatpost with a screwdriver - it *WAS* bent btw, and had another go.
Got the post in no problem, but it only went in about two and a half inches or so before refusing to go any further. So stuck my fingers in (thank goodness I have small hands) and yes, the welding on the seat stays is what's causing the obstruction. Ergo, that explains the 25.4 mm post and the shim.
It's something the calipers wouldn't have picked up, as they don't reach down that far into the seat tube.
I guess I'd be OK filing the weld back a little.
But it's been bugging me all afternoon (I was out, and you know how things just simmer in the back of your mind) so I went and had another look.
I opened out the top of the seatpost with a screwdriver - it *WAS* bent btw, and had another go.
Got the post in no problem, but it only went in about two and a half inches or so before refusing to go any further. So stuck my fingers in (thank goodness I have small hands) and yes, the welding on the seat stays is what's causing the obstruction. Ergo, that explains the 25.4 mm post and the shim.
It's something the calipers wouldn't have picked up, as they don't reach down that far into the seat tube.
I guess I'd be OK filing the weld back a little.
The calipers were borrowed, so can't measure the diameter of the seatpost right now...
But it's been bugging me all afternoon (I was out, and you know how things just simmer in the back of your mind) so I went and had another look.
I opened out the top of the seatpost with a screwdriver - it *WAS* bent btw, and had another go.
Got the post in no problem, but it only went in about two and a half inches or so before refusing to go any further. So stuck my fingers in (thank goodness I have small hands) and yes, the welding on the seat stays is what's causing the obstruction. Ergo, that explains the 25.4 mm post and the shim.
It's something the calipers wouldn't have picked up, as they don't reach down that far into the seat tube.
I guess I'd be OK filing the weld back a little.
Or cut the seat post down
OP
OP
Reynard
Guru
- Location
- Cambridgeshire, UK
The excess weld is at the junction of seat tube and the tops of the seat stays. Not sure cutting the seat post down will help with that one, as I'd end up with a mighty short post...
