PVD 5.5" Fork Hardtail Aluminum
This is going to be my first aluminum bike, so I have a few details to work out.
Contents
Geometry
Tubeset
Easton Ultra-Lite 7005 Taperwall MTB tubeset
- Down Tube - 429351
- Top Tube - 329375
- Seat Tube - 129338
- Chain Stay - S-Bend, 045715
- Seat Stay - 12° bend??, 529548
7005 Aluminum Stock
This tubing is widely available as special bicycle tubing, but is rare to find as bulk straight gauge tube. ASTM B221 Pertains to 7005(T53)(UNS A97005, #27)Aluminum in Bar Tube and Wire
| ISO | France NF | USA ASTM | German DIN | UK BS | Italy UNI | Switzerland VSM | Sweden IS | Japan JIS |
|---|---|---|---|---|---|---|---|---|
| ALZn4,5Mg1 | 7020 | (7005) | AlZn4,5Mg1 3.4335 | H17 7020 | 7791 | AlZn4,5Mg1 | 4425 |
One source is Fairing, Full 2008 Catalog
Odd Parts
Ahrens is selling some quality parts, the dropouts look very nice.
Head Tube and Headset
Custom Head tube
- Upper Stack - 8mm
- Lower Stack - 5.6mm
Fabrication Instructions
Easton Fabrication Instructions 7005 & 6061
Welding Practice
Welding Rod
"Use 5356, 5180 or 5183 fillers for welding 7005 frames.", Easton. "5356/5180/5183" Columbus
"Al Mg Si 05 (USA 6063) - CASTO MAG 45802" CeeWay.
Welded Up
Ageing - Heat Treating
Columbus
Frames in 7000 alloy.
The ageing of the frame realized in 7000 alloy has to be carried out 4/5 days after the welding, in two phases: 6 hours at 90°C ±5° - 4 hours at 150°C ±5°.
Easton
Artificial age for 7005 frames:
Age 6 hours at 200 degrees F (± 10 degrees F) plus 4 hours at 320 degrees F (±10 degrees F). This process
must be performed by the builder on all Easton 7005 tube sets.
