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Bargain on Gumtree for someone tall - https://www.gumtree.com/p/bicycles/bob-jackson-frame-reynolds-631-butted-tubing-25-/1332402023
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The one thing I would recommend is a drop of loctite on the bolts, as they're quite snug the bottle may have unscrewed one of my bolts going in and out over time and I noticed it was a bit loose. It's also possible I may have been a bit shy when tightening them originally due to the nature of them, but yeah a drop of loctite won't do any harm.
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Titchmarsh up in York look really well made - http://www.bespoked.cc/Photo%20galleries/2016%20Photos/titchmarshcycles.html
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Removing the faff of designing a caliper brake frees up a lot more space for actual aerodynamic engineering, especially on the front end. Modern frame specific calipers on TT bikes were all pretty rubbish, much like the Venge Vias and cables don't like the kinks that can come from completely internal routing.
Disc rotors are probably a touch 'slower' on paper compared to a hidden caliper but the scope they have for new fork designs (new Shiv, S5D etc) will save a lot more watts in the long run. The new Shiv has fork legs that look over 100mm apart, there's no way you could get a decent caliper rigged up on there. Hydro hoses are loads easier to hide too.
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Look ridiculous but v v good - https://www.spatzwear.com/
Depending what you need machining, I might be able to help. No fancy CNC kit but I've made parts for Feather cycles and a few others over the years.