Seatpost
987
Member
317 days
ChunkyB posted 10 weeks ago.
Stretch her legs out, perhaps.
That's honestly a weird looking seatpost. The link you provided says that it's 25.4 mm. Did you mix up the 4 and 5, or is her's just a really rare size. I'm hoping you just mixed the numbers, because I'm pretty sure a 24.5 mm seatpost would be a one-of-a-kind. Nashbar also has one, and I'm sure the other big online retailers also have some. Good luck.
If you are looking for 25.4, here are a few I found after googling 25.4 mm seatpost.
http://www.bikemannetwork.com/biking/p/ST9390
http://www.bikeparts.com/search_results.asp?id=BPC325600
http://www.bikemannetwork.com/biking/p/ST9090
"The melting point of wax means nothing to me": Thrice
877
Member
251 days
TriSooner posted 10 weeks ago.
Can you take a hack-saw and cut off an inch or two from the bottom? Or are there compression-related parts way down there? Can't tell too well but the pic you linked too makes the post look solid. Or get one of the ones Chunky B linked too. Can't go wrong trying something less than $20.
987
Member
317 days
ChunkyB posted 10 weeks ago.
TriSooner wrote:
Can you take a hack-saw and cut off an inch or two from the bottom? Or are there compression-related parts way down there? Can't tell too well but the pic you linked too makes the post look solid. Or get one of the ones Chunky B linked too. Can't go wrong trying something less than $20.
I don't think it's an issue of the post being too long. I think it's because the post flares out near the top for some weird suspension system. Kind of like aero seatposts that can't go down past a certain point.
"The melting point of wax means nothing to me": Thrice
877
Member
251 days
TriSooner posted 10 weeks ago.
ChunkyB wrote:
Oh, after a re-read and looking more closely, you are right. The suspension mechanism won't let the seat post go down any more. Got it, but wow, that's a short girl. Bike too big?
I don't think it's an issue of the post being too long.
987
Member
317 days
ChunkyB posted 10 weeks ago.
TriSooner wrote:
ChunkyB wrote:Oh, after a re-read and looking more closely, you are right. The suspension mechanism won't let the seat post go down any more. Got it, but wow, that's a short girl. Bike too big?I don't think it's an issue of the post being too long.
Exactly what I was thinking. If she needs even less seatpost than that, I'm guessing the frame is way too big for her. I guess it's a girl's bike, so stand over clearance probably isn't a problem, but if it was a guy's frame, she wouldn't even be able to reach the ground on her tippy toes.
"The melting point of wax means nothing to me": Thrice
622
Member
469 days
Iron Dan posted 10 weeks ago.
You could always just weld the seat directly to the top tube.
If you look at the description of the seat post below the picture, they list the diameter as 24.5mm. This has to be a typo because that is nothing in either the metric or inch system and I can't believe that anyone would make a seat post of such a random size. A 25.4mm seat post is a one inch seat post and you should be able to find one that should work.
185
Member
254 days
GGehrke posted 10 weeks ago.
Thomson Elite comes in every imaginable size, and is super nice, but is pricey.
A shop with access to the QBP database should be able to help you out. Their system will let them filter results according to some spec like that. You can also search QBP through Harris Cyclery (http://harriscyclery.net/page.cfm?PageID=49) but a shop has more powerful access to the system.
467
Member
460 days
Socket posted 10 weeks ago.
Thanks for the help guys!
Fortunately I did seem to have a transposition issue and the seatpost is 25.4mm. The bike is a size or two too big but it was dirt cheap for the 2 bikes, 2 polar bottles, 3 bike computers, cargo bags and racks, and hand pump so we're doing what we can with what we got.
I totally disassembled the suspension mechanism last night and recovered about an inch and a half. The flare at the top may still be keeping it just a smidge too high, but we'll see.
46
Member
141 days
SueR posted 10 weeks ago.
Tie her between two cars and run the video...
You should be able to hacksaw the bottom, those are mostly elastomers for suspension and they sit in the top anyway.
467
Member
460 days
Socket posted 10 weeks ago.
SueR wrote:
Tie her between two cars and run the video...
That could work, but its only a temporary solution ;-)
The top is the issue and if the removal of the suspension spring and spacer isn't enough it should be simpler to get a new post (now that I know it's not some bizarre exotic size). I'm sure if I had a lathe I'd try that to shave the flare down, but fortunately I don't. (that would definitely need video ;-) )
Not quite for a tri-bike, but I figure there's plenty of bike knowledge flying around here: The seatpost for my fiance's bike is an inch or two too high, but it can't be dropped any further because it's one of those built-in suspension shock absorbing thingmajiggers. I bought a new one without thinking and it had too wide a diameter to fit in her bike.
After actually looking at the current one, it turns out she has a 24.5mm seatpost in there. The only one I've been able to find online is the one that's in there already [link]. Anything I can do other than replace the bike?