tomato coupe

Just re-install the post so the original line is below the clamp -- it'll be fine.

datlas 

That's not how it works

smd4

An already too-small bike with an even shorter seat post?

I propose a toast to your knees: they were fun while they were alive.

veganbikes

LarrySellerz I don't know what your plan is but stop. Just stop. Seriously stop, as much as I get frustrated by you and this sort of nonsense, I don't want anyone getting in a wreck or hurt in that way! That seatpost is long done and needs to go in the trash. Get a new seatpost from a reputable maker and install it properly or get an actual real mechanic to install it properly.

Also keep in mind the bike is still too small so I would also get a properly sized bike. You will be much happier but in the end it is not totally dangerous, it will just cause long term damage to your body.

Atlas Shrugged

What would have happened is someone told Pollock to stop when he threw paint on a canvas, when Coco Channel had her first fashion show, when Elvis got on stage, Rodin exhibited his sculptures, when Lenny Bruce performed his comedy. Who are we to say stop! We could be witness to the ultimate expression of Bike Forums content.

Larry is at least unique and not repeating and debating the same worn out cycling wives tales from the 50’s.

LarrySellerz

Climbing bike for PRs. This bike is also stuck in the big ring. The super low seat will be out of the way (like a bmx bike or mountain bike with dropper post) and its going to be ridden standing up. The gearing will be high so you'll want to stand anyways.

Its like the people who go for a strava PR with the seatpost removed but more sensible.

The ultra light broken seatpost (you cannot buy them this light at this price point) is attractive for this function. Probably gonna slam it all the way down, and once i'm in good shape in a few months ill try to set some personal bests on it.

There are 2 upside down broken bikes in that graveyard pictured above, so im sure I can take a seatpost from there if I decide to turn this back into a sit-down bicycle.

Ooh and by the way that stub left over in the seatpost was like 3 inches, it doesn't take a cervelo engineer to do some napkin math that hints that the post was trashed before the final installation. It would have failed if installed a bit lower, that wasn't the problem lol. People lasering onto that detail are missing the forest for the trees. Also the clamp itself looks kind of cheap and dinky I wonder if that is part of the issue. There is only one bolt to tighten, the style where you have two might grip more evenly. The bolt was noticeably tight, not disturbingly so but I don't have a "feel" for tightening onto carbon like I do for metal so its hard for me to say if it was overtightened.

Eric F 

Well played, Larry.

:golfclap:

🤣🤣🤣

Lombard

LarrySellerz , I'm pretty sure you're trolling at this point. But if not, I have two words for you. Torque wrench.

wheelreason

Climbing bikes for PR requires a seat post with a maximum extension line, using one previously having a minimum insertion line could be.....never mind...

Reflector Guy

By the same line of reasoning, you don't really need both ends of the handlebar to steer the bike. Chop off one end there by the stem and you'll save a LOT of weight!

drlogik 

My response above was all tongue-in-cheek to lighten things up a bit.

Herzlos

It was 100% overtightened. That along with being beyond the minimum insertion point is why it failed.

If you really want to use what's left to make a standing hill climb bike then that's going to be fine as long as you don't actually use it.

terrymorse 

I'm skeptical of the "beyond minimum insertion point (MIP)" theory. Those are there to protect the frame and do little to protect the post.

What did sticking the post out beyond MIP line really do to the post, other than give the post an ever so slightly longer lever arm?

I'm on the "damaged by crummy clamp that was overtightened" team, with an option to join the "damaged by some reckless riding--we're talking about Larry here" team.

rosefarts

If you put a piece of rebar in it and fill the rest with grout, it should be a lot stronger.

genejockey 

This is the dumbest damn thing I've ever heard.

tomato coupe

Every frame could have a different insertion requirement. How would a stem manufacturer know where to put the insertion mark?

tomato coupe

Okay, let's see your "napkin" math.

terrymorse 

Take a look at some frames within arms reach, wave their arms around a little, take and educated guess.

In other words, "engineering".

tomato coupe

To be clear, you're saying the seat post manufacturers put arbitrary insertion lines on their seat posts to protect frames?

Maelochs

The seat post manufacturers (see post #269, above for a good laugh) defend themselves by figuring the force of a rider of whatever weight along particular lever (exposed seat post) and decide how much force the post van bear.

As I understand it, even though the most force is reacted at the rim (where the post meets the back of the top of the seat tube) in actuality, force is spread along the entire inserted forward face of the seat post (it levers against the front inside of the seat tube, with the back of the rim as the fulcrum) so the longer the inserted portion, the longer the lever arm and the lower the focused force at any one point.

rosefarts

If you think 3mm is the difference between fine and broken, you’ve probably never met an engineer.

tomato coupe

What does that have to do with seat post manufacturers trying to protect frames?

rydabent

Define "normal"!!!

terrymorse 

Yep.

But I wouldn't call it arbitrary. A considerable amount of hand waving goes into picking the position of a min insertion line.

rydabent

Wouldnt "normal" dictate this rider should have a frame that should be sized to his body, and then a "fit" procedure be done. After all a true cyclist must follow all the rules.