> If I want to go at 30mph what is that inrpms I 4th gear ?

If I want to go at 30mph what is that inrpms I 4th gear ?

Posted at: 2015-01-07 
Depends an vehicle . Ratio for diff , tyre diameter etc.

On average many cars will have around 1200-1500 rpms in fourth gear for this speed. Adding a rev counter can confirm.

It depends on the engine size & the gear ratios in the transmission & the differential

They are all different , so the Year-Make & Model would make all the difference here.

We need to know year make and model of car. The transmission gearing and final drive gearing are all different.

Gonna depend on the gearing - transmission, transfer case (if applicable), final drive.

Moped?

Bugatti Veyron?

Ocean liner?

Jumbo jet?

For better answers, ask better questions.

hard to say every car is different. I willing to guess though the car will be less than 1500rpm

Tell us the ratios in your rearend, gearbox and the diameter of your drive wheel.

Heh...

If I can run real fast, how fast is that?

2,000