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Create an accountMandrel-drawn tubes for the main triangle of a bike frame, 4130 CrMo. These 9/6/9 tubes make for a pretty stout bike and are similar to what some Bassi bikes use.
All dimensions in millimetres. Sections column states initial length/taper/second length/taper/~remaining length.
| Outer Diameter | Wall thickness | Max. Length | Butt sections |
| 25.4 | 0.9 - 0.6 - 0.9 | 500 | 75/50/240/50/~ |
| 25.4 | 0.9 - 0.6 - 0.9 | 550 | 75/50/240/50/~ |
| 25.4 | 0.9 - 0.6 - 0.9 | 700 | TBD, special mandrel |
| 28.6 | 0.9 - 0.6 - 0.9 | 550 | 80/50/240/50/~ |
| 28.6 | 0.9 - 0.6 - 0.9 | 650 | 80/50/340/50/~ |
| 31.8 | 0.9 - 0.6 - 0.9 | 600 | 80/50/290/50/~ |
| 31.8 | 0.9 - 0.6 - 0.9 | 700 | 80/50/390/50/~ |
| 34.9 | 0.9 - 0.6 - 0.9 | 600 | 80/50/290/50/~ |
| 34.9 | 0.9 - 0.6 - 0.9 | 750 | 145/50/375/50/~ |
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Review Main Tube - Double butted CrMo
