Key points
- Rev rate = number of revolutions ÷ time (s) × 60, in revolutions per minute (rpm).
- Second method: count the revolutions between the foul line and the pins, and know your ball speed.
- Rough benchmarks: stroker 250–300 rpm, tweener 300–400 rpm, cranker above 400.
- The ratio between rotation and speed matters as much as the rev rate itself.
What is rev rate?
Rev rate is the speed at which the ball rotates, expressed in revolutions per minute (rpm). Together with ball speed and axis of rotation, it is one of the three characteristics that determine the ball's path: the faster it spins, the harder it hooks when it leaves the oil, and the greater its entry angle into the pocket.
How do you measure your rev rate?
Method 1: revolutions and time
Film your delivery in slow motion with a phone, ideally from behind or from the side of the lane. Pick a clearly visible marker on the ball (the logo, the thumb hole or a piece of tape) and count the full revolutions over a measured time. Example: 6 revolutions in 1.2 seconds gives 6 ÷ 1.2 × 60 = 300 revolutions per minute.
Method 2: revolutions down the lane and speed
Count the revolutions the ball makes between the foul line and the pins, then enter its average speed (which you can measure with our ball speed tool). The tool calculates how long the ball takes to travel the 18.29 m and works out the rev rate from that. At 27 km/h, the ball takes about 2.4 s: 13 revolutions over that distance works out at about 320 revolutions per minute.
Stroker, tweener or cranker?
Bowlers are often classified by their rotation. These thresholds vary from coach to coach: they are benchmarks, not official categories.
| Style | Approximate rev rate | Characteristics |
|---|---|---|
| Low rotation | under 250 rpm | Straight ball or “spinner”: the ball hooks very little. |
| Stroker | 250 to 300 rpm | Smooth, accurate style, moderate hook. |
| Tweener | 300 to 400 rpm | In-between style, the most common in leagues. |
| Cranker | over 400 rpm | High rotation, big hook, large entry angle. |
Rotation and speed: finding the balance
A high rev rate is not an end in itself. What matters is matching rotation and speed. If speed dominates, the ball skids too long and hooks late; if rotation dominates, it hooks early and loses its energy before reaching the pins. The tool calculates the ratio between revolutions per minute and speed in mph, and gives you an indication of your balance. This benchmark is only approximate: the oil pattern, the ball's surface and your axis angle change the ball reaction a great deal.
- To increase your rev rate, work on releasing your thumb before your fingers and on your wrist action, ideally with a coach.
- To compensate for a high rev rate, a little more speed or a ball with a smoother surface helps the ball keep its energy.
Frequently asked questions
How do you calculate your rev rate in bowling?
Count the ball's revolutions over a known time and apply: revolutions ÷ seconds × 60. For example, 6 revolutions in 1.2 seconds gives 300 revolutions per minute.
What is a good rev rate in bowling?
There is no universally good rev rate. Most league bowlers are between 250 and 400 revolutions per minute. What matters is that the rotation matches your ball speed.
What is the difference between a stroker and a cranker?
A stroker throws the ball with moderate rotation and relies on accuracy; a cranker puts a lot of revs on the ball, which follows a pronounced hook and enters the pocket at a steep angle.
Can you measure your rev rate with a phone?
Yes: film in slow motion, spot a visible point on the ball and count the revolutions over a measured time. Taking several measurements gives a more reliable result.