I've got a 30mm seat tube on my Iron Horse 6Point which is an odd-ball size.
The outside diameter of the seat tube is 34.9 (a fairly common size).
Many 30.9 ID seat tubes also have a 34.9 OD.
The thought is to have a machinist drill & ream the seat tube out to 30.9mm so that the bike can have more seat post options.
Does any one have any experience drilling / enlarging seat tubes? Is there a heat-treated surface finish, or anything like that, on frames that will be compromised by drilling out the seat tube?
The outside diameter of the seat tube is 34.9 (a fairly common size).
Many 30.9 ID seat tubes also have a 34.9 OD.
The thought is to have a machinist drill & ream the seat tube out to 30.9mm so that the bike can have more seat post options.
Does any one have any experience drilling / enlarging seat tubes? Is there a heat-treated surface finish, or anything like that, on frames that will be compromised by drilling out the seat tube?