Gear Ratio/RPM Chart by tire diameter

 

Street Tire:  BFG T/A radial

Drag Tire:    BFG Drag Radial  235/60-15, Mickey Thompson Drag Radial 235/60-15

Steel Rims

 

By Gary Pavlovich

1962 to 1965 Mopar Mail List Member

The 1962 to 1965 MoparฎWeb Site!

http://1962to1965mopar.ornocar.com/welcome.html

 

October 2005

 

Gear Ratio       3.23                              3.73                               3.91                               4.10

 

Tire Diameter

                26.1  26.6  27.1  28.9         26.1  26.6   27.1  28.9          25.1  26.1  26.6  27.1  28.9       25.1 26.1 26.6  27.1 28.9

 

 Miles per hour @:

RPM

2600    62.5  63.7  64.9  69.2          54.1  55.1  56.2   59.9          49.6  51.6  52.6  53.6  57.2       47.3 49.2  50.2  51.1 54.5

 

2800   67.3  68.6  69.9  74.5           58.3  59.4  60.5  64.5           53.4  55.6  56.6  57.7  61.5        51    53     54     55   58.7  

 

3000   72.1  73.5  74.9  79.8          62.4   63.6  64.8   69.1         57.3   59.5  60.7  61.8  65.9       54.6  56.8  57.9  59   62.9

 

3200   77     78.4  79.8  85.2          66.6   67.9  69.1  73.7          61.1   63.5   64.7  66    70.3       58.3  60.6  61.7  63   67.1

 

3400   81.7  83.3  84.8  90.5          70.7  72.1  73.5  78.3           65     67.5    68.8  70.1  74.7     61.9  64.4  65.6 66.8  71.3

 

Tire 235/60 245/60 255/60 255/70      235/60  245/60  255/60  255/70    235/60  235/60  245/60  255/60  255/70    235/60  235/60  245/60 255/60 70

Size   15”…                                15”…                                   14”     15”…                                14”    15”…

 

 

 

 

                         235/60-14    235/60-15    245/60-15    255/60-15    255/70-15    275/60-15    285/70-15 

Rim Range          6-9”            6-9”             7-8.5”          6.5-10”        6.5-10”        7-9.5”          7-9.5”

Rim Diameter                                                        7.5”             7.5”                             8.5”

Section Width     9.5”            9.5”               9.8”             10.2”           10.1”            11”              11.5”

Tread Width       7.6”            7.6”                                8.2”             7.6”             8.9”              8.5”

Tire Diameter    25.1            26.1              26.6               27.1             28.9               28               28.9

Revs p/mile        820              797               782                768              720              743               675