Brackets and mounts
Triathlon Training Bike Frame Assembly
- Bounding box
- 1219.2 × 457.2 × 1028.1 mm
- Engine
- Precision B-rep
- Parameters
- 28
- Published
- October 11, 2026
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The prompt
Generate a 2D mechanical fabrication drawing for a stationary Ironman Triathlon/Time-Trial training bike frame using 2-inch steel square tubing. This is a high-performance training machine, NOT a standard exercise spin bike. It must feature aggressive triathlon geometry: the seat tube must rise from the bottom bracket shell at a steep, forward-leaning 78-degree angle to open up the rider's hip angle. The frame reach from the bottom bracket horizontally forward to the adjustable vertical steering mast must be exactly 18.5 inches. The frame stack height from the bottom bracket vertically up to the handlebars must be adjustable from 24 to 26 inches using a telescoping mast. The saddle height from the center of the bottom bracket to the top of the seat must be fixed at 28.5 inches. The rear of the frame must feature horizontal dropouts spaced exactly 135mm apart to lock in a standard mountain bike training wheel. The main floor base must be an H-shape measuring 48 inches long by 18 inches wide for absolute stability during heavy pedaling.
Parameters
| Name | Value | Range |
|---|---|---|
| Base Overall Length | 1219.2 mm | 1000 – 1400 |
| Base Overall Width | 457.2 mm | 300 – 600 |
| Square Tube Size | 50.8 mm | 25.4 – 76.2 |
| BB Shell Width | 68 mm | 50 – 80 |
| BB Shell Outer Diameter | 40 mm | 30 – 50 |
| Seat Tube Angle (from horizontal) | 78 deg | 60 – 85 |
| Seat Tube Length to Saddle Top | 723.9 mm | 600 – 850 |
| Reach (BB to Head Tube) | 469.9 mm | 350 – 600 |
| Head Tube Height | 250 mm | 100 – 400 |
| Chainstay Length | 400 mm | 300 – 500 |
| Seatstay Junction Height above BB | 400 mm | 200 – 600 |
| BB Height above Floor | 300 mm | 200 – 400 |
| Stack Height (BB to Handlebar Clamp) | 635 mm | 609.6 – 660.4 |
| Outer Mast Tube Size | 50.8 mm | 38.1 – 63.5 |
| Inner Mast Tube Size | 44.5 mm | 38.1 – 57.2 |
| Mast Overlap Length | 80 mm | 40 – 150 |
| Handlebar Width | 400 mm | 300 – 500 |
| Handlebar Depth (fore-aft) | 30 mm | 15 – 60 |
| Handlebar Thickness | 20 mm | 10 – 40 |
| Saddle Length | 280 mm | 200 – 350 |
| Saddle Width | 140 mm | 100 – 200 |
| Saddle Thickness | 20 mm | 10 – 50 |
| Dropout Inner Spacing | 135 mm | 100 – 150 |
| Dropout Plate Thickness | 6 mm | 3 – 10 |
| Dropout Plate Width (along x) | 50 mm | 30 – 80 |
| Dropout Plate Height (along z) | 40 mm | 25 – 60 |
| Dropout Slot Length | 20 mm | 10 – 40 |
| Dropout Slot Width | 10 mm | 5 – 15 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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