Hand Built Bicycle Frame Builders Of Chicagoland

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The place to showcase hand built bicycle frames, and to talk about everything related to frame building. Made In Chicago

Location: Chicago
Members: 46
Latest Activity: Feb 18, 2015

Started by Jason B.. Last reply by Jason B. Nov 11, 2013.

Started by Todd Allen. Last reply by olloyd1 Feb 5, 2010.

Started by on2wheels. Last reply by Todd Allen Jan 21, 2010.

Comment

Comment by CJ on September 15, 2011 at 6:13am: I have a crack developing in the seat post collar on my old steel trek. can anyone recommend where I should look to get it repaired. thank you. below is a pic

https://lh6.googleusercontent.com/-q57LKriDdSk/TnFiph0GQrI/AAAAAAAA...

Comment by UV Metal Arts - Powder Coating on July 29, 2010 at 2:33am: Glad to here it all went well. Sean is a great asset to UV Metal Arts.

Comment by Primitive Don on July 29, 2010 at 2:21am: UV, your guy Sean/Shaun (sp) did a nice job straightening out the old school Diamondback BMX frame I brought in. Watching him do it was quite educational!

Comment by Todd Allen on January 21, 2010 at 3:40pm: Are you building a folding bike?

Comment by UV Metal Arts - Powder Coating on January 21, 2010 at 3:38pm: Matt feel free to call me or come on by. I have sleeved cromoly before and would be glad to help.

Comment by Matt M. 18.5KM on January 21, 2010 at 12:26pm: Todd - as it turns out the I.D. of my steel cromoly seatpost is 26.2mm. I'm not certain yet but Curb Dog makes a cromoly seatpost in a 28.6mm. I'm still trying to get the I.D. of that particular make. I believe with enough extension into a steel seatpost will allow for a telescoping alloy 26.2mm upper section. I plan to use a seat clamp to hold it in place as Dahon and Brompton do on their bikes. I really like this seatpost clamp - looks robust - 28.6mm Primo Viking seatpost clamp
http://www.ebikestop.com/primo_viking_286mm_seatpost_clamp_silver-S...

Comment by Michael Catano on January 20, 2010 at 6:16pm: 230mm is a pretty substantial addition to a seatpost... how long is the original post? Steel or aluminum? This is probably not a great idea.

Comment by Todd Allen on January 20, 2010 at 6:11pm: Matt,

Unless you need a special seat post of dimensions that can't be purchased new, I don't think modifying an existing one makes much sense.

If you simply butted two pieces of tubing together and brazed them you will have a much weaker post than one made from a single length of tubing.

To make it strong you would need to sleeve tubing inside to reinforce the joint. This will make a heavier post. And unless you are extremely lucky to have additional tubing that perfectly fits, you will likely have to lathe all 3 pieces of tubing. So add in extra expense for the time and effort to do the machining in addition to the brazing and now you have a heavy expensive seat post.

If I was going to make a custom seatpost I would use a single piece of tubing cut down to the appropriate length and then join a seat clamp to one end. That joint can be built up if needed since it doesn't need to slide into the seat tube.

Comment by Matt M. 18.5KM on January 20, 2010 at 2:17am: Hey UV - I need to add 230mm of length to my seatpost. Assuming I provide you with the tubing what will it take for you to braze them together?

Comment by on2wheels on December 10, 2009 at 11:03am: Todd, You should start a discussion topic just above. I am sure people will have some advice, and there is variety of it.
I can chime in on a few things I have heard.