Originally Posted by
rmfnla
Exactly, and 27.2 posts are much more common than 27.0
I love the doomsayers who think removing a hair's breadth of metal is an invitation to catastrophe.
I'm not really a doomsayer and Sheldon is correct, it's only a 1/10 of a mm. However, thin wall steel tubes have walls as little as 0.5 to 0.7 mm thick in the butted ends. So that 0.1 mm means removing 15 to 20% of the total metal thickness. Here is an example from the Columbus Tubing web site:
http://www.columbustubi.com/eng/4_4_1.htm
On a cheaper, heavy wall frame I wouldn't hesitate to ream it to 27.2 but I wouldn't do it on thin wall, light weight frame.