Joined: Dec 2004
Posts: 12,560
Likes: 799
From: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, Bacchetta Quattro, Catrike Speed
Whatever the word is, it seems like the Park tool, which I also have, isn't as reliable as good-old measuring the chain with a tape measure. From center of rivet to center of rivet should be 12 inches for 12 full links. I prefer to change it out at 1/16" of elongation.