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Message: [QUOTE="D36-108A, post: 548174, member: 37268"] There are a whole bunch of different roll charts to choose from. Only some of them show only the possible checks. Most show what your mileage is supposed to be at each minute or vice versa. If you don't get a "possibles only" JART chart (#4, #7?), and even if you do, it's a good idea to learn the possible check interval for each speed average. A roll chart, clock or stopwatch, and a resettable odometer are every bit as effective as a computer, possibly more so. But you do have to learn when to stop looking at them and just ride like your hair is on fire. [/QUOTE]