Hi Tristram,

The majority of local rollcage constructors use The Circular Hollow Section tube supplied by Parker Steel. It's of the correct size and wall thickness to comply with the NASA rulebook. It also bends easily in a pipe bender and former.

The minimum approved size is 32mm diameter with a wall thickness of 2.5mm. I think Parker's size is slightly over this at 33.7mm dia. and 2.5mm wall thickness.

Hope this helps!

Thanks Neil, that's a great help :-)

Hi I know this is an older post
but i am looking to buy cds tube to build a cage, I emailed Mr Ramsey at Parker steel and this was his reply

Unfortunately we cannot do seamless tubes

So any other ideas where to buy

They say the size 31.75 outside diameter x 2.64mm wall, 12swg Cold drawn seamless carbon steel is the size we are to use which is a nats off 32mm

Paul IK125 / IK225 / IK325/