Raceworks Donuts are Tight Radius 5052 Grade aluminium, and welded on the outside only
They all feature a 41mm dia hole in the centre
| Tube dia. Imperial | Tube dia. Metric | Part No. | Wall Thickness | Centre Line Radius | Bead Rolled | Finish |
|---|---|---|---|---|---|---|
| 2.0″ | 50.8mm | ITD-200 | 2.0mm | 45.9mm | No | Raw |
| 2.5″ | 62.0mm | ITD-250 | 2.0mm | 51.5mm | No | Raw |
| 3.0″ | 76.0mm | ITD-300 | 2.0mm | 58.5mm | No | Raw |
| 3.5″ | 89.0mm | ITD-350 | 2.0mm | 65.0mm | No | Raw |
| 4.0″ | 101.0mm | ITD-400 | 2.0mm | 71.0mm | No | Raw |
| 5.0″ | 127.0mm | ITD-500 | 2.0mm | 85.0mm | No | Raw |