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Old 06-18-08, 07:14 AM   #1
tekknoschtev
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Minimum Insertion of Seat Post

On the ride to work today, I discovered that I must have gone past the minimum insertion marker. Not a pleasant experience, but fortunately, nothing is broken aside from my hind quarters. I'm going to track down a set of wrenches to get the seat back in place and tighten it down.

But the seat post has no markings as to what would be the proper minimum insertion (that, or the rust that has built up has obscured the minimum insertion point, its a 28ish year old bike so that wouldn't surprise me). So I wonder, what would be a safe bet? I'd just fudge it and guess but I don't want to go through this again on the way home (though, I have tools there so it wouldn't be as bad).
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Old 06-18-08, 07:21 AM   #2
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I just walked downstairs and checked a few seatposts that were in my junk box. For 3 out of 4 the minimum mark was 4" above the bottom of the post. The other had the minimum mark 3" above the bottom.
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Old 06-18-08, 07:23 AM   #3
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I just walked downstairs and checked a few seatposts that were in my junk box. For 3 out of 4 the minimum mark was 4" above the bottom of the post. The other had the minimum mark 3" above the bottom.
Thanks for the quick reply. I can almost definitively say that I've either broken the post or well surpassed the 4" mark, and even the 3". I think its time for me to swing by the bike shop and scope out a bigger seat post because I was just getting used to riding up higher, and feeling better after my rides.
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Old 06-18-08, 10:51 AM   #4
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Go for a Thompson at the low end price range.
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Old 06-18-08, 10:56 AM   #5
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Go for a Thompson at the low end price range.
Thanks, but I'm going to pass on a seat post that costs $90-150. Unless I'm missing something searching for it, that seems to be about the price point they're at. The bike isn't remotely worth that (28-29 year old department store special that my dad gave me). I'm all for keeping what I have in good working order, don't get me wrong about that, but $90 is out of the question.

As it stands right now when our systems guy gets back from lunch I'm snagging his wrench set and going to readjust the seat post to get it where its safe to ride home. I'll then just switch back to my commuter MTB until I can find a suitable replacement seat post.
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Old 06-18-08, 11:13 AM   #6
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Thanks for the quick reply. I can almost definitively say that I've either broken the post or well surpassed the 4" mark, and even the 3". I think its time for me to swing by the bike shop and scope out a bigger seat post because I was just getting used to riding up higher, and feeling better after my rides.
Kalloy posts come in 400mm length, scads of diameters, and full retail cost is only around $25.00. That's long enough to leave a full foot of seatpost exposed.
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Old 06-18-08, 12:30 PM   #7
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Thanks, but I'm going to pass on a seat post that costs $90-150. Unless I'm missing something searching for it, that seems to be about the price point they're at. The bike isn't remotely worth that (28-29 year old department store special that my dad gave me). I'm all for keeping what I have in good working order, don't get me wrong about that, but $90 is out of the question.

As it stands right now when our systems guy gets back from lunch I'm snagging his wrench set and going to readjust the seat post to get it where its safe to ride home. I'll then just switch back to my commuter MTB until I can find a suitable replacement seat post.
Yeah, I have a bill for mine, but to each his own.
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Old 06-18-08, 06:51 PM   #8
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If it's not marked you want at the seatpost to at least clear the rear lug/seatstay/toptube juncture. How much... is open for debate.
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Old 06-18-08, 07:04 PM   #9
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Thanks everyone for the advice. kellyjdrummer, hopefully I didn't come off too snarky. I mean not to criticize others for their purchases or recommendations, I was just cranky due to riding on a crooked seat and still having a crooked seat. Were this bike something other than a "let me see what I like" bike, I probably would consider those posts more.

Turns out by my coworker "having a full set of wrenches" he meant he had socket wrenches out of a cheap-o computer cut that only went up to 3/8". I needed 1/2" for my seat post bolts so I was out of luck there. Had to go crawling back to my previous employer (helps that the guy living with me works there, and I've maintained good relations with them ) to borrow their tools. When I got home I used some light sand paper to cut through some of the rust and I found the minimum insertion point - about 2" below the seat! YIKES!

For now its just a touch past the minimum insertion point, but thats because its very uncomfortable to ride at the point. I'm currently saving to pick up a used road bike to replace this one, so for now it'll do, and I'll only use this for leisure rides. I have a MTB built up for a commuter so I'll just swap over to that and take the performance hit until I can afford something better.
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