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Create an accountMandrel-drawn tubes for the seat tube of a bike frame, 4130 CrMo. Tapered 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.
See here for other main tubes.
| Outer Diameter | Wall thickness | Max. Length | Butt sections |
| 29.8/28.6 | 1.2 - 0.6 - 0.9 | 500 | 100/25/235/20/~ |
| 29.8/28.6 | 1.2 - 0.6 - 0.9 | 560 | 100/25/330/20/~ |
| 29.8/28.6 | 1.2 - 0.6 - 0.9 | 620 | 100/25/360/20/~ |
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Review Seat Tube - Triple butted CrMo
