Gearing should be between 82 and 88 gear inches for novice riders. (48 x 15 (86″) is ideal for adult riders) a slightly higher ratio around 88-90 gear inches is preferred for racing.
From http://www.hernehillvelodrome.com/starting/bikes/. So 50 x 16 (84") is prettty good.
@Cooky started
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From http://www.hernehillvelodrome.com/starting/bikes/. So 50 x 16 (84") is prettty good.