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Group: Administrators
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It all depends on your circumstances. 6mm of solid rod will always be stiffer than 6mm OD tube. However its a compromise between weight and strength, hence why tubes are often used. In bending there is still tension and compression on the opposite sides of the tube/rod with less force in the middle, hence why with a reasonable wall thickness, the weight reduction more than offsets the slight strength loss from having a tube over a rod.
If you are stuck with 6mm, then a rod is your only option but with the added weight penalty. if not, id try a 8mm OD tube and see how you get on.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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