This is an IRD cassette, nothing to do with Riv other than they are a 
retailer. The odd cog choices apears to be an IRD chacterstic in both 
cassettes and FW's. They seem to be in love with 17-21-24 jumps when 
17-20-24 is to me at least, perfect. Also 15-18-21-24  on 6 sp. FW when 
15-17-20-24 is perfect.   

  Gear charts are great, I like Mikey's as it's customizable , it has some 
presets but you can modify any cog choice or just manually type in the cogs 
. http://home.earthlink.net/~mike.sherman/shift.html

    17-21 jumps are quite large , regardless . 

     Thought has no beginning and no end . 

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