Diff Ratio. The chart below shows e36 e46 e90 e91 e92 e93 e85 e86 e83 e82 e88 transmission gear ratios it only shows cars that were available in the us. Differential gear ratio also known as final gear differential gear ratio.
Enter diff gear ratios and tire diameter then drag rpm slider to calculate speed from rpm. Enter shift at rpm select gear to shift to and hit shift and trace to run up through the gears recording shift point rpm and km h. A more powerful engine can use a higher rear end to give relaxed cruising and a higher top speed.
You don t need the tire diameter calculator in this case but be advised that most stated tire sizes rarely match the actual tire height.
Data may not be 100 accurate. Truck and off road tires may have a specification like 30 9 5r15 where 30 is the tire diameter 9 50 is the tread width and 15 is the wheel diameter. Drag max rpm slider to adjust the range of the rpm and km h gauges. Changing a diff to better suit larger wheels tires is a good idea and in some cases is a must.
