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Seatpost snapped 20 miles from home

Old 05-20-20, 06:46 AM
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Funktopus
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Seatpost snapped 20 miles from home

So I'm out in the country, coming down a hill and go over a harder than expected bump at speed. My seat snaps off the seatpost and I'm thrown on the bank. Looking at the damage the post is snapped right at the very top, by the seat attachment.

I'm pretty far from home, but there's a Halfords 3 miles away, where I can probably buy one of these: https://www.halfords.com/cycling/bike-parts/saddles-seats-posts/micro-adjust-seat-pillar-27.2-591166.html

Sadly my Internet connection is too weka to upload a photo out here, but I don't know my seat post size. It's a vitus 787. Any advice on how to figure out my seatpost size without a tape measure, or guesses on how likely that one is to fit?

Thanks!
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Old 05-20-20, 06:49 AM
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Lemond1985
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What year is yours? I see a couple "for sale" ads that list 25 mm. Might be a hard size to find.
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Old 05-20-20, 06:51 AM
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Seat posts are usually stamped with the diameter. Remove what you have and look around the bottom where the size will be near the minimum insertion line. Good luck.
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Old 05-20-20, 06:53 AM
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Update: some photos https://photos.app.goo.gl/K8AcLZY4G8ofmQfe7
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Old 05-20-20, 06:54 AM
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Originally Posted by Lemond1985 View Post
What year is yours? I see a couple "for sale" ads that list 25 mm. Might be a hard size to find.
I don't know unfortunately, but that's a good place to start. Options are pretty limited out here though!
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Old 05-20-20, 06:58 AM
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Originally Posted by Moe Zhoost View Post
Seat posts are usually stamped with the diameter. Remove what you have and look around the bottom where the size will be near the minimum insertion line. Good luck.
https://photos.app.goo.gl/mot8Btt4FeBbuvd66

Clearly its in a bit of a state, but looks like the 25mm theory is plausible.
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Old 05-20-20, 07:00 AM
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The Sheldon Brown site says 25.0mm for a Vitus 787
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Old 05-20-20, 07:11 AM
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It looks like the bottom cradle snapped? Maybe you could find a way to re-attach the saddle/clamp to the post and gingerly ride it home? Or clamp on something else to sit on? Or just ride home without a saddle as best you can. Good luck.
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Old 05-20-20, 08:17 AM
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Phoned the local bike shop and they thought they had something to fit a 25mm seatpost. Rode the 7 miles over there without a seat - never have I appreciated how much core strength cycling standing up uses! Turns out they had a 25.4mm and it just doesn't fit. So on this occasion it's the local train station that saves the day.

Might see if I can find a size that's smaller and shim it with a beer can. I need a beer anyway, so it's a two birds one stone kind of situation.

Thanks all for your help and research, I appreciate it!
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Old 05-20-20, 08:18 AM
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Originally Posted by jethin View Post
It looks like the bottom cradle snapped? Maybe you could find a way to re-attach the saddle/clamp to the post and gingerly ride it home? Or clamp on something else to sit on? Or just ride home without a saddle as best you can. Good luck.
I think if I'd had some cable ties handy this would have been possible. Might start carrying some in future.
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Old 05-20-20, 08:39 AM
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I wonder if you could scrounge a straight seat pillar and clamp as found on a lot of cheap mountain bikes or department store bikes? At least that'd let you sit for the ride home.

This is the type of seat pillar and clamp I'm talking about.




Good luck and cheers

Edit. iirc BMX seatposts are/were often 25.0mm in diameter.

Last edited by Miele Man; 05-20-20 at 09:36 AM. Reason: Added comment
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Old 05-20-20, 12:19 PM
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Be a man, stand up and ride. It's only 20 miles.
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Old 05-20-20, 12:55 PM
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Shimming a seatpost in aluminum frame is not a real good idea, unless you buy a shim or precision machine one yourself. If you're off even by a little bit in thickness, you might cause a fatigue crack in the frame. Hell, I've seen an 0.2mm undersize seatpost cause a crack in a 531 frame!

Since you mention Halfords, I guess you are probably in the UK. It looks like you can get a cheap Velo-orange "Dajia" post on ebay UK for £26.39.

Last edited by scarlson; 05-20-20 at 01:02 PM.
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Old 05-20-20, 01:20 PM
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Originally Posted by scarlson View Post
Shimming a seatpost in aluminum frame is not a real good idea, unless you buy a shim or precision machine one yourself. If you're off even by a little bit in thickness, you might cause a fatigue crack in the frame. Hell, I've seen an 0.2mm undersize seatpost cause a crack in a 531 frame!

Since you mention Halfords, I guess you are probably in the UK. It looks like you can get a cheap Velo-orange "Dajia" post on ebay UK for £26.39.
Actually I was looking at the exact same listing. I wasn't aware of Velo Orange, but they seem to get pretty good reviews for their frames. And they also make a reproduction of the cables that were originally on my Vitus, which is cool. Just waiting for someone to turn down my lowball offer on a vintage Shimano seatpost before I grab that Velo Orange.
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Old 05-20-20, 01:22 PM
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Originally Posted by oneclick View Post
Be a man, stand up and ride. It's only 20 miles.
If we're talking business I should have just sat on the snapped off seatpost 💁‍♂️
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Old 05-20-20, 01:23 PM
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Pretty sure that lower end Peugeot used 25.0mm seatposts, but they aren’t common.
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Old 05-20-20, 01:42 PM
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Originally Posted by Dfrost View Post
Pretty sure that lower end Peugeot used 25.0mm seatposts, but they aren’t common.
Likely a French thing. Some high-end constructeurs also would shim larger sized tubes to take 25.0 seatposts, at least in the late '40s and early '50s.
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Old 05-20-20, 03:28 PM
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Kalloy has seatposts in that size. Don’t know offhand who the UK distributor is, it is normal bike parts, should not be hard to find. If you need to have a specific brand and style of correct seatpost that could be hard.
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Old 05-20-20, 03:30 PM
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Originally Posted by Funktopus View Post
I think if I'd had some cable ties handy this would have been possible. Might start carrying some in future.
Do not shim, it can distort the ST/lug and be unreliable.

I would get a proper sized one or sand down a 25.4 carefully to fit.
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