
hi all
would it be a problem if i made my trailing arms out of 20 mm instead of 25 mm as the book states
it is seamless and about 4mm wall thickness
cheers
colin
Should be fine 
I'm using 21mm x 3mm seamless and have told that is overkill (16g ERW is apparently quite usable) so you should be fine at that.
Cheers
Alex