The bike I ordered has a 11-28 cassette and I'd like to switch to a 12-25. Should I take a link out of the chain? The calculator on epicidiot.com says 54 links for both but the machineHead site says 53 links for the 12-25. The largest chainring is 53 and the chain stay is 40.5cm. If I do, it's an ultegra 10 speed chain. Is it just a matter of removing the link with the chain tool and getting a new pin? Thanks.