Vehicle speed (mph), engine speed (rpm), tire diameter (inches), trans gear ratio, and rear axle gear ratio are all interrelated. If you know four out of five of these values, you can determine what ...

How many of you actually know which manual transmission model is clinging to your Jeep's underside? What about its ratios? Some spot checking around the offices here was not very impressive. With that ...

My friends Volkswagen Tiguan 2.0 Auto Diesel does 60mph at 2000 rpm in top gear on a flat road. I think this is about 500rpm too much. There is no change in rpm when switching the gear change from ...

The optimal gear ratio depends on how the engine fits the intended use of the boat. Courtesy Yamaha In every boat test we run, we include certain specs that we feel are valuable to our readers. Some ...