Join Date: Jul 2008
Location: Melbourne, Australia
Bikes: 2010 Giant Filter 1. 07/08 Apollo Independent.
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Low normal and rapid rise are the same thing. I believe you mean high-normal.
If in doubt, locate the RD cable where it is exposed (Probably underneath the top-tube), click the shifter into a middle gear, and (while pedalling) pull on the exposed cable.
Low-normal will shift into a HIGHER gear (smaller sprocket) when the cable is pulled, while a high normal will shift into a LOWER gear (Larger sprocket.)