Originally Posted by DaveSSS

Use the chain length formula. I tried one online calculator and it was wrong. For my 46/30 crank, 10-36 cassette and 415mm chain stays : 46+36= 82. 82/4=20.5. 415/25.4=16.34. 16.34x2=32.68. 20.5+32.68+1 = 54.18

I would use a 55 inch chain because the total is over 54. The online calculator said 54 was OK and 53 was shortest possible - wrong.

Never count links. Measure the length between pin holes center to center, then add the half inch for the quick link. My chains measure 54-1/2, plus the quick link.