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One other thing to note is that a steeper STA does allow for reasonably short chainstays though when trying to fit fatter tires in a performance frame and getting things right down to the mm of clearance. You simply can't put a 700x35 tire in a frame with a 71.5-STA and 415mm stays - so even if you can use a 71.5-STA with a zero SB post and get roughly the same position as a 73.5-STA with a 25mm SB post, there may be other reasons not to do it that way.
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