roll bar tube

[shh120m]

sorry if this has already been asked (im sure it has) but i cant find it.

What diameter tube and what wall thickness do i need for the roll bar? Also does it have to be seamless? My old man has a mate whos an industrial pipe fitter and he has use of a mandrel bender at work, so i was going to have a crack at making one myself. Obviously i will probably have to compromise depending on what size formers he has but Im sort of toying with the idea of a full cage if the steel doesnt cost the earth.

thanks

[davedew]

I made the cage for my roadster from 50.8 o/d x 3.2 wall erw. Should be plenty strong enough.

[SeriesLandy]

You only need seamless if you want to race professionally ie FIA.

The ones ash had made were 50.1mm and 3.2mm thick ERWlink here (http://www.haynes.co.uk/forums/showthread.php?t=3204&highlight=rollbar).

[fabbyglass]

You only need seamless if you want to race professionally ie FIA.

The ones ash had made were 50.1mm and 3.2mm thick ERWlink here (http://www.haynes.co.uk/forums/showthread.php?t=3204&highlight=rollbar).


The MSA call for seamless tube for cages and roll bars as well, even at club level.