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Old 02-26-06, 10:26 PM
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T-Mar
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The SLJ 5500 was Simplex's top, all aluminum derailleur from the mid and late 1970s, while the SLJ6600 is it's early 1980s successor. The prime difference is the upper pivot casting and how the parallelogram attaches to it. On the SLJ6600, the pivot casting has an arm extending down below the pivot bolt and the parallelogram is mounted so that it protrudes forward and is nearly horizontal. The older SLJ5500 does not have this arm on the upper pivot casting and the parallelogram is more vertical like on the Simplex Prestige. The dropped paralleogram on the SLJ6600 is a better shifting design and was popularized by SunTour and Shimano.
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