Today I did something to my bike thread...

cletus · 14-10-2022 10:27AM

https://www.boards.ie/discussion/comment/119742702#Comment_119742702

😂😂😂

In general, how are these things attached? Do they just clip on (not the oak one, thank you very much)

hesker · 14-10-2022 10:35AM

I’d expect they attach to the crank arm and you might need longer bolts and maybe spacers. Or they might require a purpose built chainring that has threaded holes for attachment.

Mundo7976 · 28-10-2022 06:30PM

My frankenstein is complete. Not the most pretty thing but functional & will work over the winter months. A bit twitchy up front, might be down to needing new bearings though. Pleased enough with the outcome.

28-10-2022 06:59PM

Are the new cranks a bit/much longer than the ones you took off? Hard to say for sure from the picture, how much space is there to the floor when the pedal is at 6'O clock?

Mundo7976 · 28-10-2022 07:16PM

Must be camera trickery, they're both the same length 🤷🏻‍♂️

CramCycle · 28-10-2022 07:36PM

Doing the same myself to a cheap planet X bike I picked up. Turns out the seat post is fused though and it's sitting a few inches to low. Planning to turn it upside down and feed ammonia through the bottle cage bolts

magicbastarder · 28-10-2022 08:23PM

aluminium frame? what's the seat post?

CramCycle · 28-10-2022 08:43PM

https://www.boards.ie/discussion/comment/119806042#Comment_119806042

Steel frame, aluminium seat post. I've tried freezing and heating but nothings budging. I might also use Cola instead of ammonia, would be more cost effective to try first.

Squidgy Black · 28-10-2022 09:32PM

https://www.boards.ie/discussion/comment/119806126#Comment_119806126

Had the same issue with a Kona Paddywagon over the lockdown, went at it with hacksaw blades to try cut segments out etc, neighbour who’s a fabricator ended up just chopping the seat tube and welding a new piece in

magicbastarder · 28-10-2022 09:55PM

are you sure he wasn't lying to you?

Squidgy Black · 28-10-2022 11:18PM

https://www.boards.ie/discussion/comment/119806388#Comment_119806388

Unfortunately yeah as I ended up having to paint it myself. Post had been in the frame for about 4 years and never moved in that time so was never coming out

edit: I have been whooshed

JMcL · 29-10-2022 11:08AM

A bit twitchy up front, might be down to needing new bearings though

I think that's common with this style of frankenbike though. Hydrids trend to have longer top tubes and slacker head tube angles to complement the width of the flat bars. I imagine the latter is what's making it twitchy

Still, must say the result looks grand, and so long as the twitchiness is something you can get used to, what harm

beggars_bush · 29-10-2022 08:46PM

cleaned the bikes today. good deep clean too. nothing else to do as it was absolutely bucketing it down outside

cassette, rear mech, chains all looking very snazzy.

iwillhtfu · 31-10-2022 10:35AM

https://www.boards.ie/discussion/comment/119805839#Comment_119805839

I've tried all the fads and generally they don't work or it's a combination of them all and then it releases and whichever was the last used i.e Coke its miraculous 😂

For seized posts I find the best is a soak in wd40 leave over night. Then leverage is your friend, lay the frame on it's side on a flat surface. Stillson spanner on the post and then a long bar on the stillson. 9/10 times it will break loose with the lightest or pressure. The seat post is generally a write off either way.

I have never tried the above with a carbon frame as they generally don't get stuck but I wouldn't recommend.

magicbastarder · 31-10-2022 11:38AM

and AFAIK you don't want slow steady pressure to break the bond. you want a fairly percussive tap.

iwillhtfu · 31-10-2022 02:01PM

https://www.boards.ie/discussion/comment/119814847#Comment_119814847

From experience leverage has been the deciding factor on several stuck seat posts. Sure a tap on the seat tube may help similar to how an impact would work.

cletus · 31-10-2022 03:20PM

Agree with the above, if you can clamp the seat post in a bench vice, you can use the frame itself to increase the leverage

CramCycle · 31-10-2022 05:50PM

https://www.boards.ie/discussion/comment/119814640#Comment_119814640

Its definitely bonded alu to steel so Wd40 won't do anything unfortunately (I don't think).

https://www.boards.ie/discussion/comment/119815658#Comment_119815658

Already tried, not even a budge. It's so tight a blow from a hammer will just bend the seat post. My dad had a weird drop hammer thing that acts like a vice that will pull with a jolt but I'd have to make it as I won't be home for awhile. I'll try the coke first and then ring my dad to ask what it's called.

gameoverdude · 31-10-2022 05:59PM

Kinda off topic,but I actually used it!

Felt good.

magicbastarder · 31-10-2022 06:00PM

https://www.boards.ie/discussion/comment/119806126#Comment_119806126

freezing it would have a better chance than heating it, as i understand, as Al has a bigger coefficient of expansion than steel.

Squidgy Black · 31-10-2022 06:17PM

https://www.boards.ie/discussion/comment/119816176#Comment_119816176

Probably a slide hammer is it?

cletus · 31-10-2022 07:03PM

@CramCycle at that rate I can't see a slide hammer working.

There are homemade jigs I've seen for pulling the seat post, but you'd want to have the materials to hand

Edited to add: if you can put it back in the vice, and get something to use as a lever (I used a length of 4x2).

Position the lever between the seat tube and the head tube, and use it to increase the torque as you turn

CantGetNoSleep · 31-10-2022 08:29PM

How often should you be removing the seat post to prevent this happening? I've had a bike fit on all of my bikes so don't like to fiddle with the saddle height

hesker · 31-10-2022 08:34PM

Sodium hydroxide solution has been used successfully I believe. Poured in the BB. It reacts with Al.

If you google it I think you should find an account of it. I would not have the frame completely upside down. Just a slight angle off it and add portionwise and rotate to add more

hesker · 31-10-2022 08:36PM

Also I think I read somewhere about a guy constructing a type of slide hammer again using the BB to add nuts to threaded rod or something like that.

iwillhtfu · 31-10-2022 08:41PM

https://www.boards.ie/discussion/comment/119816176#Comment_119816176

You just need more leverage. I'm talking get an 8ft piece of steel on the end of a stilson. I wouldn't use the frame to leverage as there's a good chance you'll bend something if it's that stuck.

The hammer you're referring to is a slide hammer they're used for pulling out dents in autobody shops.https://www.screwfix.ie/p/hilka-pro-craft-dent-puller-kit-9-piece-set/62730?gclid=CjwKCAjw5P2aBhAlEiwAAdY7dAoKww-x80QDOCZ11YGnPzuhkSvan5C-qfjQbv7-JtpNWYbG5qKJoxoC6NkQAvD_BwE&gclsrc=aw.ds

cletus · 31-10-2022 08:49PM

https://www.boards.ie/discussion/comment/119816758#Comment_119816758

How do you secure the frame while pulling on the Stilson

iwillhtfu · 31-10-2022 09:28PM

https://www.boards.ie/discussion/comment/119816782#Comment_119816782

I've always laid them flat on the deck as it creates a bit of space between the seat post and the ground. Then have some one hold it down, it may be similar forces exerted on the frame but in my eyes I don't think they are.

They key is twisting as opposed to pulling. I've yet to be stumped by one but I'm sure it'll happen at some point and hopefully we'll find out the coke is miraculous after all 😂

cletus · 31-10-2022 09:45PM

https://www.boards.ie/discussion/comment/119816924#Comment_119816924

I think if you use the 4x2 like I suggest earlier, it results in rotational force too. I've had it work on a seat post that hadn't been moved in about 35 years 😁

iwillhtfu · 31-10-2022 09:49PM

https://www.boards.ie/discussion/comment/119816980#Comment_119816980

Yep I missed that, I generally use a length of unistrut as it's naturally heavy.

Today I did something to my bike thread...

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