WTB: Old road bike

[Evan]

Where the rear wheel bolts up = drop outs

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You want the horizontal adjustment in them to get the chain tension right

yeah, I know thats where the wheel bolts up to, but what does "horizontal" mean. I cant see how it would not be vertical and still be able to hold a turning wheel....

edit- got it, thanks. this bike was made in 1991 so it may be borderline, but im pretty sure they have an angle