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Bike Transmissions - Reference
Below is a reference table which shows the standard calculations for a few known bikes.
See Gear Ratios Document

  Upd  Title  Front  Rear  LowRatio  HighRatio  ChainS  Range  TireD  LowInch  HighInch
    Search Term       SortOrder
TitleFrontRearLowRatioHighRatioChainSRangeTireDLowInchHighInch
Masi Giramondo44/32/2211-360.614.047656%2716108
Custom 9.36 Opus Extreme42/32/2211-360.613.845623%2716103
Low Gear Gravel Bike (Hypothetical)36/2211-360.613.339541%271689
Custom 8.3442/32/2211-340.653.843585%2718103
Custom 9.34 (Opus)42/32/2211-340.653.843585%2718103
Rocky Mountain (Robin) 199342/32/2212-320.693.540507%261891
Brodie Quantum (Yellow, Betsy)42/34/2211-320.693.841551%261899
Custom48/38/2811-420.674.451657%2718119
Custom 9.3242/32/2211-320.693.841551%2719103
Custom 8.32 (Brodie)42/32/2211-320.693.841551%2719103
Specialized Diverge (low front, rear)46/3011-420.714.247592%2719113
Trek 520 Large Size48/36/2611-360.724.447611%2719119
Surly Disk Trucker 202148/36/2611-340.764.445579%2721119
Devinci Stockholm (Steve)48/36/2611-340.764.445579%2721119
Specialized Diverge (Maria)48/3211-420.764.447579%2721119
Custom48/38/2811-360.784.445564%2721119
Moulton (Jacques B)56/44/3411-271.265.138405%16.792186
Opus Legato48/38/2811-340.824.443537%2722119
Brodie Elan with 36 tooth cassette46/3011-360.834.241506%2722113
Surly LHT50/39/3011-360.834.545542%2722122
Specialized Diverge Sport (Steve G)46/3011-340.884.239477%2724113
Brodie Elan (Standard) 202146/3011-340.884.239477%2724113
Brodie Roam 202046/3011-340.884.239477%2724113
Moulton Speed (17" wheels)58/4410-301.475.834395%172599
Miyata 1000 (Robin)50/40/2814-300.933.638387%272597
Specialized Women's Comp48/3211-340.944.439468%2725119
Giant Toughroad SLR GX148/3211-340.944.439468%2725119
Brodie Romulus50/3411-341.004.539450%2727122
Diverge 202250/3411-341.004.539450%2727122
Custom Wolf52/3814-381.003.738370%2727100
Trek 1.5 - Shimano 105 (BillM)50/3411-321.064.537425%2729122
Green Holdsworth (Steve)50/3214-301.073.634336%272997
SRAM Force 1 Setup4810-421.144.832421%2731130
Blue Norco (Robin)52/4013-341.184.033339%2732108
Chris K Folding bike5812-341.714.822281%203496
Brompton 6HR (has internal hub)50163.133.1null99%165050
Total: 36