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Spring Blues/ Bridgestone Expanding Seatpost Dead..Can I use seatpost clamp?

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Spring Blues/ Bridgestone Expanding Seatpost Dead..Can I use seatpost clamp?

Old 03-11-10, 06:15 PM
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Drwecki
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Spring Blues/ Bridgestone Expanding Seatpost Dead..Can I use seatpost clamp?

Hey all, I got a bridgestone that someone else threw away. Anyways, The bridgestone has one of those exapnding seatposts (like a quill stem).. The bolt (not the seatpost) cracked in half... the bolt is stuck in the wedge part and is rusted in (hence why it broke in the first place)..

And I want to be able to use this frame it's a stainless steel submariner... With AL lugs.. Any DIY solutions anyone knows of?

Brian
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Old 03-11-10, 06:22 PM
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Drill out the bolt and buy a new bolt?
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Old 03-11-10, 06:39 PM
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How do you drill out a bolt?
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Old 03-11-10, 06:42 PM
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Originally Posted by Drwecki View Post
How do you drill out a bolt?
You'd use a drill.
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Old 03-11-10, 06:44 PM
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If you have the piece with the broken bolt stuck in it your more than welcome to send it to me and I'll do it for you.
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Old 03-11-10, 07:25 PM
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I think the post is stuck in the frame...
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Old 03-11-10, 07:32 PM
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I can't help you get it out, it takes time and patience, but don't throw out the quill nut. I just made a quill seatpost to replace one in my Schwinn 564. It's not that hard.
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Old 03-11-10, 08:32 PM
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No the post is out. I removed it a while back when I first got it, but when I tried to take out the bolt and clean it up a bit, the bolt broke in half. And what a nice offer to drill it out for me that's super cool. Tell me more about how you diy-ed a seatpost for the 564. The quill nut is weird, it's not solid, like the a cut off end of a tube.

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Old 03-12-10, 10:26 AM
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Post a pic of what you have.

I've got two bikes with those seatposts at home and another given to a relative 20 miles away so I "should" be able to figure something out. How close to Waukesha are you? Are you mechanically inclined and comfortable using drills and such?

I'm going to be mixing up a batch of wood bleach in a few weeks now that winter is thawing out, might be an option to help salvage some parts of your situation.
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Old 03-12-10, 10:50 AM
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I live in Madison, so Waukesha's not that far away. As for mechanically inclined-ness I am good up until I have to do fabrication. My weak point is my drill, but I also don't feel comfortable drilling out a bolt (because I've never done it & my drill sucks). I will post a picture soon, but I think I may have figured it out....build up the Schwinn Sprint first...

or Use a shim of some sort and do a variation of this.

http://bmx.transworld.net/1000076881...dge-seat-post/
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Old 03-12-10, 11:00 AM
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Originally Posted by RobbieTunes View Post
I can't help you get it out, it takes time and patience, but don't throw out the quill nut. I just made a quill seatpost to replace one in my Schwinn 564. It's not that hard.
any further info on how to do this? i have a 754 i'm gonna need one for. thanks.
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Old 03-12-10, 11:01 AM
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I work near Waukesha but live an hour farther northeast so if you're still stuck when you get back to it then maybe I can help. There's a couple of other resourcefull bikeforums people out by you as well.

Also keep an ear open for when the StVincent bike clearance sale is, you might get lucky and find a bike there if all you're looking for is the seatpost. Bridgestone, Kabuki (Bridgestone), and a few other brandnames used that style of post. You should be able to scramble through their inventory fairly quickly if you just focus on the seatpost and don't care about anything else. A few folks on the site here have mentioned that the sale gets a little crazy when they open the doors.
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Old 03-12-10, 11:05 AM
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Post a pic.

My LBS gave me a bunch of NOS stem bolts/angular wedge nuts of various lengths. I might be able to help.

J
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Old 03-12-10, 11:23 AM
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Originally Posted by treebound View Post
I work near Waukesha but live an hour farther northeast so if you're still stuck when you get back to it then maybe I can help. There's a couple of other resourcefull bikeforums people out by you as well.

Also keep an ear open for when the StVincent bike clearance sale is, you might get lucky and find a bike there if all you're looking for is the seatpost. Bridgestone, Kabuki (Bridgestone), and a few other brandnames used that style of post. You should be able to scramble through their inventory fairly quickly if you just focus on the seatpost and don't care about anything else. A few folks on the site here have mentioned that the sale gets a little crazy when they open the doors.

Yeah, the St Vinny's sale is usually every other Saturday, but I'm going to rev cycles swap this Saturday (3 bucks to charity to get in..generaly good deals..maybe I'll get lucky). You know what's even better moving day, this is how I got my Bridgestone kabuki Submariner (and my Schwinn Sprint) to begin with...FREE OF CHARGE. I got what I pain for!


As for a DIY solution. Here's what I'm thinking might work... I get a metal tube that fits inside my seat tube (my seat tube is a rather large diameter)... I then cut this metal tube with a hacksaw to have the same angle as my wedge bolt (a bolt that I will pillage from my parts box of some stem that I own) and the seat tube... Then I simply find a bolt that is long enough and that will fit the seat tube (or you hack the seat tube down a bit to fit the bolt..keep the same angle)...Then it may work as is...or I may need to buy an additional shim to go around the wedge (sort of like the seat tube shims they sell on the internet). I think this may work... for the Schwinn too! See the website for the BMX hack!
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Old 03-12-10, 11:20 PM
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Originally Posted by jco1385 View Post
any further info on how to do this? i have a 754 i'm gonna need one for. thanks.
PM sent
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Old 03-13-10, 10:34 AM
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Questions:

1. What's the advantage of a wedge seat post? Disadvantage?

2. Does a frame need to be constructed differently (heavier-than-normal gauge top of seat tube) to use one?

2A. If not, and one were to use a wedge seat post in a frame built with a clamp, wouldn't it be smart to leave the seatpost bolt in the clamp anyway, to keep it from splitting open when stressed?
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Old 03-13-10, 07:41 PM
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Originally Posted by Charles Wahl View Post
Questions:

1. What's the advantage of a wedge seat post? On a frame with no binder, it allows you to ride your bike.
Disadvantage? Heavier.

2. Does a frame need to be constructed differently (heavier-than-normal gauge top of seat tube) to use one?
Not that I know of. The frames that use them aren't, as far as the Schwinns...

2A. If not, and one were to use a wedge seat post in a frame built with a clamp, wouldn't it be smart to leave the seatpost bolt in the clamp anyway, to keep it from splitting open when stressed?

Maybe, but the binder doesn't stop the tube from splitting, having the proper size seat post prevents this, as the post cannot create force at an angle to the tube if it can't move around in the tube.

Unless the binder is compromised, I'm not sure why you'd want a quill seat post in a seat tube not made for one.

The binder keeps the seat post at it's proper height and pointed in the right direction. The split in the seat post at the rear, used with a quill seat post, could be a problem area, I'd guess. Seat tubes designed for quill posts do not have any splits or expansion/contraction cuts in them.
As far as I know...and that ain't much.
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Old 03-13-10, 07:58 PM
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I recently made what amounts to a quill seatpost to fix a frame that was crushed in a Park stand. You definitely need a heavier wall. Lots of old gaspipe wouldn't even notice it though.

As far as drilling out a bolt, the most interesting idea I've heard is to use a left-handed drill bit. You can get them from McMaster-Carr.
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