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1 comments
I wouldn't bother unless you want bigger tyre clearance or going for discs (I have tyres measuring 32mm on my CAAD12 with rim brakes). I assume you are looking at a 54, a 52 CAAD12 could be closer in terms of frame reach/stack at 536 and 381.
Remember that due to steerer angle the more spacers the less reach you actually get (and less spacers more reach).
If you say ran a 54 CAAD10 with a 15mm spacer you would run a 54 CAAD12 with a 10mm spacer to get same actual stack, but would gain more reach, over and above the 4mm the figures suggest.