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 Post subject: 30.2 Seatposts?
PostPosted: Wed Apr 24, 2013 6:47 pm 
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Joined: Thu Mar 25, 2004 8:34 pm
Posts: 471
I'm buidling a bike on the Dave Yates Framebuilding course this summer.

I need a 30.2mm Post to fit my design.

Does anyone know of anything nice?


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 Post subject: Re: 30.2 Seatposts?
PostPosted: Thu Apr 25, 2013 4:23 pm 
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Joined: Thu Jan 26, 2006 6:01 pm
Posts: 1513
Thomson makes a 30.0. I've never seen a 30.2.


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 Post subject: Re: 30.2 Seatposts?
Posted: Thu Apr 25, 2013 4:23 pm 


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 Post subject: Re: 30.2 Seatposts?
PostPosted: Thu Apr 25, 2013 7:52 pm 
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Joined: Thu May 04, 2006 4:43 pm
Posts: 5066
Location: Wherever there's a mountain beckoning to be climbed
You could get a custom seatpost, for instance Bold Precision http://www.boldprecision.com/custompricelist.htm.


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 Post subject: Re: 30.2 Seatposts?
PostPosted: Fri Apr 26, 2013 5:33 am 
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Joined: Sun Feb 10, 2013 5:11 pm
Posts: 84
Why 30.2? Braze in a seat tube sleeve and get a standard 27.2.


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 Post subject: Re: 30.2 Seatposts?
PostPosted: Fri Apr 26, 2013 9:22 am 
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Joined: Thu Aug 25, 2005 7:09 pm
Posts: 1227
Location: In the industry
27.2 isn't ideal for metal frames IMHO.

In a recent project to develop a light alu frame, we were using some nice 7-series alu tubing, which can be down to 0.7mm in certain places and generally between 0.8-1.2mm. The seat tube ended up being really heavy because we had to use 2.3mm tubing (the distance between 27.2 and 31.8). I could easily save 45grams if I could use a thinner seat tube.

Generally 2.3mm tubing simply is too thick for lightweight Alu or Steel (you don't need THAT much material to make a sturdy seat tube). You could put in a sleeve but that adds uncessary weight.

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