Anyway here's a teaser of an update for you. All my tubing is here to make the frame Quick list-
- 4130 Head Tube and BB Shell from and old steel frame
- Ceeway 'Thron' Seat Stay Tubes (4) and a set to be unused top tube
- Reynolds 853 Seat Tube for 30.9 Dropper Post
- Reynolds 631 Top Tube
- 1.2mm Walled Down Tube from Sky-Craft (thick walled to handle suspension loads)
|Head Tube Joint with Down Tube, including DT gusset|
Another minor problem I encountered was that a 30.9mm seat tube, with its 1.2mm top wall thickness, meant my outer diameter on the tube was 33.3mm. Nobody makes a 33.3 seat clamp so my choces were make a seat clamp, fixed or otherwise, or make the 33.3 into a 34.9 to take a standard size QR clamp. I decided to step up the size on the seat tower so it would take an existing clamp as making a custom one may be costly. I lucked upon the fact that my top tube was .8mm wall and an outside diameter of 34.9mm- Perfect.
I cut a short length of this tube as I needed the remainder for the top tube, you have to cut from the long butted end with butted tubes so this is usually scrap anyway. Once I had cut it down I pressed it onto the 33.3OD tube and smoothed off the cut edge toline with the top of the 33.3 tube. Pretty happy with the results shown below.
|Seat Tube Tower with 34.9mm adapter pressed onto it, ground a little chamfer on to tidy things up.|
|With Seat Clamp attached, clamp slot to be drilled and cut out|
|DT/BB Junction. tubing to be cut to allow possibility of future internal cable routing for dropper post|
|DT/BB/ST junction. to be marked out on down tube for further dropper post cable clearance|
Also got someone to knock up some Bushings and an axle for my pivot. PTFE bushing 13mm alloy axle. Check Trevor Bennett's blog out here. Also a big thnks to his late father, Wilf, whom without his engineering prowess, trevor may not hve had a lathe. Cheers Wilf.
|Pivot Kit, consisting of housing, two press fit bushings and a 2 piece Axle|
Welding front triangle this week - stay tuned