What it all Means

SP

The sequential "Shifting Pattern" of your Chainring x Freewheel combination
( 1st gear, 2nd gear, 3rd gear,... etc )

MDxHDxSDxFW

The MD represents the Main_Chainring, where the pedals are, thus, where your feet go. The HD is what I call the "Host_Chainring". This is the chainring that is directly connected to the MD ring. The SD is what I call the "Slave_Chainring". This chainring is the one that connects to the freewheel.

GI

"Gear Inches".

DI

The distance in INCHES traveled in a single pedal rotation.

diff

The difference in INCHES between the present DI value and the next sequential DI value.
The diff values are displayed in inches, with a decimal remainder.

 SP  MDxHDxSDxFW      GI       DI      diff       DF        PRPM     RT

 5>  54x36x54x16   136.69   429.42    28.63    35' 9.42"   147.55  1: 5.06
 6>  54x36x54x15   145.80   458.04    32.72    38' 2.04"   138.33  1: 5.40
 7>  54x36x54x14   156.21   490.76    37.75    40'10.76"   129.11  1: 5.79

The "28.63" on line 5> shows the difference between the DI value on 5> and the DI value on 6>. This means there is a difference of 28.63 INCHES of ground covered in a single pedal rotation between the chainring & freewheel combinations of 54x36x54x16 and 54x36x54x15 ( on a 27.00 inch wheel ).

DF

The distance in FEET traveled in a single pedal rotation.

PRPM

"Pedal Rotations Per Mile".

RT

Gear Ratios.

 SP           Shifting Pattern
 MDxHDxSDxFW  MainDrive x HostDrive x SlaveDrive x FreeWheel
 GI           Gear Inches
 DI           Distance traveled in INCHES in a single pedal rotation
 diff         Difference in INCHES between the present DI value and 
              the next sequential DI value. 
 DF           Distance traveled in FEET in a single pedal rotation
              displayed as FEET'INCHES.decimal_remainder"
 PRPM         Pedal Rotations Per Mile
 RT           Gear Ratios

 Wheel Diameter: 27.00    54/36/54   12-13-14-15-16-17-19-21-23
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 SP  MDxHDxSDxFW      GI        DI      diff       DF         PRPM      RT
----------------------------------------------------------------------------
 1>  54x36x54x23    95.09    298.72    28.45    24'10.72"    212.10  1: 3.52
 2>  54x36x54x21   104.14    327.17    34.44    27' 3.17"    193.66  1: 3.86
 3>  54x36x54x19   115.11    361.61    42.54    30' 1.61"    175.21  1: 4.26
 4>  54x36x54x17   128.65    404.16    25.26    33' 8.16"    156.77  1: 4.76
 5>  54x36x54x16   136.69    429.42    28.63    35' 9.42"    147.55  1: 5.06
 6>  54x36x54x15   145.80    458.04    32.72    38' 2.04"    138.33  1: 5.40
 7>  54x36x54x14   156.21    490.76    37.75    40'10.76"    129.11  1: 5.79
 8>  54x36x54x13   168.23    528.51    44.04    44' 0.51"    119.88  1: 6.23
 9>  54x36x54x12   182.25    572.55     0.00    47' 8.55"    110.66  1: 6.75

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