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Message: [QUOTE="whenfoxforks-ruled, post: 1296855, member: 73147"] Wow, 60 hours on a 250f? So the x-ring chain will out last 3 top ends? In 06, my son raced 30 some races on his 450f, plus practice and my occasional romp. 1 top end, and 2 sprocket and chain sets. On the 250f, 6 races for him and 4 for me, and practice, 2 top ends and 1 sprocket and chain set. He always preferred figuring the hours as opposed to an actual meter. At 1 hour per race, and 1 hour of practice twice a week, I put that at 90 hours on the 450f and 30 for the 250f. He has some real speed(usually top 5 in a class), and mine diminishes with age(+45b). Joe, you failed to mention the price of that fancy chain? [/QUOTE]