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Travel Agent ®
A stepped pulley device from Quality Bicycle Products, designed to change the amount of cable travel. The principal application of these is to permit the use of traditional short-pull brake levers with direct pull cantilevers or other brakes that are designed for long-pull levers.
See the Brake Lever Types entry for more details on this issue.
The cable from the lever normally goes around the small step of the pulley first, then through a hole onto the large step. This causes the cable leaving the Travel Agent to be pulled twice as far (but half as hard) as where it enters. It can also be used in the opposite direction if desired. (Q.B.P. Photo)
Note: the small-diameter pulley will fatigue the cable, resulting in fraying and failure, sooner or later.
