For me, the terms cranker, stroker, tweener have
nothing to do with:
- Rev Rate
- Line (swinging or playing up the boards)
- Accuracy
Crankers can play up the boards with a low rev rate and pin-point accuracy. Strokers can hook the entire lane while hitting a different target on every shot. Tweeners can out rev crankers and have more accuracy than strokers.
Before I define the terms, consider a couple of current bowlers from the PBA tour: Ryan Schafer, Chris Barnes, and Mike Scroggins. I classify Schafer as a cranker, Barnes as a stroker, and Scroggins as a tweener. Generally Barnes has the highest rev rate, followed by Schafer then Scroggins.
I judge by a combination of (purely physical) swing and release style.
Strokers tend to have smooth swings and smooth, clean releases next to or even slightly behind the ankle. They can have lower rev rates like Brian Voss or higher rev rates like Michael Fagan or something in between like Pete Weber. Today, the players with the higher rev rates that fit this category are often called "power strokers". "Smooth" does not mean accurate. It is difficult to find an inaccurate player on the tour, so it is difficult to give a well-known example.
Crankers tend to have jerky swings with more moving parts (bent elbows, hands that change position from one place to another in the backswing, etc). There is large amount of effort in the release, again with more moving parts. The ball is released later, usually in front of the sliding ankel and the bowler tends to "hit up" on the ball or create a release action that looks like the ball is being launched from a shovel. Look at the tremendous effort Mark Roth (the classic cranker) put into his swing and release. Ditto with Ryan Schafer, Jason Couch, Eugene McCune, and even Walter Ray Williams at times. Though nowhere near as much effort as Roth, compared to many bowlers today, these bowlers often have later release points, put more effort and snap into the release motion, and have more complex swings with effort. These are all outstanding bowlers, very accurate, who can play up the boards as well as cover the entire lane.
Tweeners - well that should be easy enough to guess. Maybe it is a bowler that puts effort or some complex motions into their swing but have a clean, smooth release like Mitch Beasely or Tommy Jones. Or maybe it's someone with a clean, easy swing with a hitch in their release (me) like Ritchie Allen or Mika Koivuniemi.
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