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monkeyseemonkeydo

Home Made Dropper Post

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Cross post from trials-chat in case it's of any interest to those in here. Basically frame is 27.2mm and the options for dropper posts are few and far between while being silly expensive so I put one together with a cheap 25.4 seatpost, plastic USE shim as a bush and automotive gas strut giving a full 150mm of travel. Currently adjusted by manually operating the QR but considering looking into a remote system if I can be arsed.

Right, here we go. First up pics in the lowered and raised positions:

p1000467medium.jpg

p1000466medium.jpg

The components: The gas strut had to be turned down by a fraction to clear the ID of the seatpost and I just used a couple of bits of delrin to act as a spacer to the top of the seatpost and a stop which sits on top of the main pivot tube inside the seat tube. It's set up so that at max extension the post sits at the perfect height so it always goes to the right place and I can then lower the post to anywhere up to 150mm when I feel like it. A little bit fiddly to operate the QR on the move to start with but now pretty slick at it and since a lot of dropper posts operate via a lever under the nose of the saddle I didn't think it was too bad.

p1000473medium.jpg

Close up of the ball ended screw that goes through the seat clamp and seat tube:

p1000474medium.jpg

The travel:

p1000475medium.jpg

The only mod needed to the frame:

p1000476medium.jpg

Hopefully a video...

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That's ace! I had been wondering about making a dropper post and thought about those office chairs that have the lever but figured they would all be too large! Had never thought about using a car strut :) Nice one!

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It obviously works quite well with this frame because the main pivot gives a nice surface for the delrin disc to sit on but I'm sure there'd be ways to make it work all the way to the BB shell if needed. The little ball ended bolt also means the seat clamp can't rotate when it's loose so it's always where you expect it to be (Y).

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Yeah I need to figure that out on mine, as it would hit my BB. I'm sure I can make some sort of wedge to go in the seatube that goes in through the BB area. I have a CF 27.2 seat post with a use plastic shim, so my seatpost slips up and down a treat which is ideal for this setup! Looking forward to trying this out

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What would you want this for? Is it just for lazy seat adjustment?

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What would you want this for? Is it just for lazy seat adjustment?

A poor mans way of having a seat dropper I guess.

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I get that...but what is a dropper post actually used for? I had a quick google, but couldn't really understand what it did!

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Its a quick way to adjust seat height without stopping basically

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That's a brilliant bit of work they, cheap too I expect!

What would you want this for? Is it just for lazy seat adjustment?

I've got a reverb post on my Five, so much better being able to ride non-stop without getting off and adjusting the seat height. Until you try it you might not 'understand' how great it is!

Edited by AndrewEH1

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Aaaah! Lazy then :P

P.S - Paul...you're a fanny. You know why ;)

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Ha ha, taken your time to notice mate ;)

And yeah dropper posts are lazy, and expensive. I think the expensive part is what makes them so essential...

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Part of it stems from not knowing if I wanted a dropper or not but fancying having a go. I could quite happily afford a Reverb or whatever but the Scotsman in me thinks it'd be silly having the single most expensive part on the bike being a seatpost (whole bike was only £750 I think). The strut was about a tenner, the seatpost is a cheap £10 jobbie (not the lightest but obviously has slightly thicker walls for machining purchases. Total cost of the whole setup was about £30 I guess.

Not so much lazy as allowing the height to be adjusted on the fly. If you know you're coming up to a steep section, you don't need to either stop and adjust or make do with trying it with the saddle up your arse you can just adjust it on the go. To be perfectly honest since doing the bodge I haven't used it that much but it's good to know that I can when I want!

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I love this Dave, I've been thinking about getting one, but I'm not sure if I need one, much like yourself. I don't like the idea of the lever being under the saddle it looks iffy, but for some reason using the seat qr looks better. If I knew how to I would love to try it on my frame, but I don't fancy drilling a hole into a carbon frame.

Anyway, top job. Your not just all muscle :P

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The pictures don't work

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Nor does your attitude towards this forum.

The topic is 6 years old. You'll get over it.

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Just because you asked so nicely (and because someone else asked for them via a message a couple of weeks back)...

p1000466medium.jpg

p1000467medium.jpg

p1000469medium.jpg

P1000475 (Medium).JPG

p1000476medium.jpg

p1000474medium.jpg

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