Re: wheels
With the 16 in. tires, your road speed will be apx. 7.5% slower with the same engine speed.
For Example,
Assuming your speedometer was correct with the 21 in. Tires.
With the 16 in. tires, when your speedo is reading 45 MPH, your road speed will only be apx. 42 MPH.
You can correct most of this error by replacing the speedo gear (Turtle) on the torque tube with one with one more teeth. Theroretically, your speedo will read a little fast but this is better then reading too slow.
If your speedo read a little fast before, change the gear with one with two more teeth.
I hope I have done my math correctly.
Good Luck and let us know how you came out.
Chris
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