Originally Posted by
RH Clark
The problem would be in locating an adapter 10 years from now when you need a new seat post and can't get one of those D shaped ones either. I wouldn't think anyone would need anything except the stock post for quite a while, but accidents happen eventually.
Obsolete parts supply for Giant bikes really is a non-issue. I get it that you prefer to avoid proprietary parts, but you are just making up an issue that doesn't actually exist. This is not some obscure bike brand we are talking about. Giant spares are easy to find for any vintage.