Originally Posted by
rekmeyata
right for horizontal, but the question was about vertical. I have a couple of 80's era bikes with horizontal dropouts with the screws and some without, but a person can adjust for the chain slack without the screws, it's just easier with them, and the skewers have to be strong enough to hold the hub in place without slipping.
My comment had nothing to do with adjusting chain slack. It was made to point out an error.
The comment you made to which I replied reads (in part) as follows:
Chain tension on a derailleur bike is automatically adjusted by the spring on the derailleur arm, so these bikes have a vertical dropout slot with no adjuster screws.
In my reply, I even highlighted the portions of the above to which I was referring. I guess you missed that.
As written, your comment categorically states that derailleur bikes have vertical dropouts. For that categorical statement to be true, it would need to apply to
all bikes/frames using derailleurs. That in turn means your statement, as written, is not correct - because not all bikes with derailleurs (or frames designed to be used with a derailleur) have vertical dropouts.
That's the point I was making. It's also why I provided two examples of frames with horizontal dropouts and adjuster screws that had integral derailleur hangers.
Had you qualified your statement concerning derailleur bikes using vertical dropouts to indicate that there were exceptions, I'd probably have said nothing.