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Duo-Rateâ Reduction Chart

Percent of Reduction 4.5% 9.1% 13.1% 16.7% 20.0% 23.1% 26.0% 28.6% 31.1% 33.3% 37.5% 39.4% 42.9% 44.5% 47.4% 50.0%
Reduction Sprocket 21 Tooth 22 Tooth 23 Tooth 24 Tooth 25 Tooth 26 Tooth 27 Tooth 28 Tooth 29 Tooth 30 Tooth 32 Tooth 33 Tooth 35 Tooth 36 Tooth 38 Tooth 40 Tooth
Direct Rate Population Reduced Rate Population
18000 17190 16362 15642 14994 14400 13842 13320 12852 12402 12006 11250 10908 10278 9990 9468 9000
19000 18145 17271 16511 15827 15200 14611 14060 13566 13091 12673 11875 11514 10849 10545 9994 9500
20000 19100 18180 17380 16660 16000 15380 14800 14280 13780 13340 12500 12120 11420 11100 10520 10000
21000 20055 19089 18249 17493 16800 16149 15540 14994 14469 14007 13125 12726 11991 11655 11046 10500
22000 21010 19998 19118 18326 17600 16918 16280 15708 15158 14674 13750 13332 12562 12210 11572 11000
23000 21965 20907 19987 19159 18400 17687 17020 16422 15847 15341 14375 13938 13133 12765 12098 11500
24000 22920 21816 20856 19992 19200 18456 17760 17136 16536 16008 15000 14544 13704 13320 12624 12000
25000 23875 22725 21725 20825 20000 19225 18500 17850 17225 16675 15625 15150 14275 13875 13150 12500
26000 24830 23634 22594 21658 20800 19994 19240 18564 17914 17342 16250 15756 14846 14430 13676 13000
27000 25785 24543 23463 22491 21600 20763 19980 19278 18603 18009 16875 16362 15417 14985 14202 13500
28000 26740 25452 24332 23324 22400 21532 20720 19992 19292 18676 17500 16968 15988 15540 14728 14000
29000 27695 26361 25201 24157 23200 22301 21460 20706 19981 19343 18125 17574 16559 16095 15254 14500
30000 28650 27270 26070 24990 24000 23070 22200 21420 20670 20010 18750 18180 17130 16650 15780 15000
31000 29605 28179 26939 25823 24800 23839 22940 22134 21359 20677 19375 18786 17701 17205 16306 15500
32000 30560 29088 27808 26656 25600 24608 23680 22848 22048 21344 20000 19392 18272 17760 16832 16000
33000 31515 29997 28677 27489 26400 25377 24420 23562 22737 22011 20625 19998 18843 18315 17358 16500
                                 
Also available:                              
42 tooth sprocket = 52.4%                          
45 tooth sprocket = 55.6%                          
48 tooth sprocket = 58.4%                          
50 tooth sprocket = 60%