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Discuss light weight issues concerning road bikes & parts.
- Posts: 771
- Joined: Thu Mar 25, 2004 8:34 pm
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?
- Posts: 1730
- Joined: Thu Jan 26, 2006 6:01 pm
Thomson makes a 30.0. I've never seen a 30.2.
- Posts: 84
- Joined: Sun Feb 10, 2013 5:11 pm
Why 30.2? Braze in a seat tube sleeve and get a standard 27.2.
- Posts: 1235
- Joined: Thu Aug 25, 2005 7:09 pm
- 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.
. 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.