Bluebird

WOG Speed Calculator

Enter Engine Speed       
Enter Axle Ratio             
Enter Trans. Ratio         
Enter Tire revs per mile 
Speed in MPH
 
The transmission ratio can be entered as 1 for direct,  the ratio of V- drive, or for overdrive. If you want to check the speed in 3 gear of an Allison 740, it is 1.38

The factory std Axle ratio for MCI 7-8-9  and Eagle is 3.70
 

The BB 42 w/ 60 series came from the factory std Axle ratio 4.89
 

The BB 42 w/ 60 series and Alison 4060 has an OD Transmission and the final 6 gear ratio is .64
 

Look up the Revs per mile  below or at dealer location.
http://www.michelin.com/us/eng/tire/truck/tires/xza/xza2_sp.html
http://www.goodyear.com/   Goodyear
http://www.toyo.com/   Toyo
http://www.trucktires.com/   Firestone/Bridgestone

Revs per mile will vary with different Tire manufactures
Toyo M144 315/80Rx22.5=487
Continental HSL1 Coach 315/80Rx22.5=491
Firestone HP3000 315/80Rx22.5=491
Michelin 315/80/22.5 XZA=492
9R22.5 = 542 =   8.25x20
10R22.5 = 520 =   9.00x20
11R22.5 = 504 = 10.00x20 
12R22.5 = 492 = 11.00x20
11R24.5 = 480 = 10.00x22
12R24.5 = 470 = 11.00x22
 

 

 

 
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