Originally Posted by sethkins88
Im trying to figure out if my gears have been redone. Im running about 3200 rpms at 70mph. My speedo is off my 5mph as well. Just wondering if you guys are running similar rpms with the same setup.
Speedo is off 5 MPH which way?
If you are 3,200 RPM at 65 MPH, your gear ratio is probably 4.56.
If you are 3,200 RPM at 75 MPH, your gear ratio is likely 4.10.
Your actual tire height and the innacuracy of your speedo are the (2) unknown factors that are making it impossible to say with certainty.