Reaming seatpost tube for dropper post?

[Gtpulse]

Stupidly and wanting to avoid the soda mess I tried to remove a stuck seatpost with a blacksmiths drill. Even with everything clamped down I mullered the seat tube and that was with a drill bit something like 26mm to take out a 27.2mm seat post. I’m not an engineer but am usually pretty careful/handy with making/repairing. I’m sure someone with the ability to clamp the frame and a big enough mill/pillar drill could do the job, however, given the likely use of the bike if a dropper is being fitted I don’t think I’d want to risk weakening the frame.

 

[CTK]

Makes sense to do a post rather than the frame like in the above video. You can always chuck it away if you cock it up.

 

[Tootyred]

The middle of that seat tube gets very thin.....most of that you will remove trying to ream it.

Riding a fag paper don't sound that good to me or that long lived.

 

[was8v]

No way jose

The reason droppers aren't available in the smaller sizes is the inner post has to be smaller, and not snap or bend.


Get a frame with 26.8 and fit a gravity dropper...

Or bigger, e.g. lots of aluminium frames from the era, or I know Orange P7's have a decent size seat tube if you remove the shim.

I have a '97 M2 stumpjumper that has 30.9 post for this purpose.

I have a '92 steel checker pig that has a big seattube.

 

[mattr]

I dont get why droppers are so hard to make. Its an office chair shaft with a cable attached.

Think the uncontrolled spinning might be a bit off putting...

 

[novocaine]

Think the uncontrolled spinning might be a bit off putting...

Spoilsport.

You know the spinning isnt in the pneumatic unit don't you? Its a bearing underneath it.

They also only come in 27mm diameter. I've got one in the garage i liberated from a skip rmto play with.

 

[Spudalumps]

Wetting myself laughing!

 

[mattr]

Spoilsport.

You know the spinning isnt in the pneumatic unit don't you? Its a bearing underneath it.

Some do, some don't. The one we exploded in the DT lab at school span freely. Until we exploded it.

I'd like to see how fast a saddle would come up on top of one of them, getting your crown jewels in the way would be a whole new type of pain...

 

[novocaine]

Challange excepted.

 

[mattr]

Challange excepted.

Castration expected...