wheels
 

I put 600-16 wheels on my 29 tudor (21inc, tires) the 21s are 96inc. OD the 16s are 89inc.OD what is the diff. in MPH? Many thanks!!

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

Re: wheels
 

Just a guess.....MPH will be approximately 7% slower than the speedo reading.