Choosing the Right Bowling Ball for Better Spare Conversion: A Coach’s Step‑by‑Step Guide

Spare conversion is the difference between a good game and a great one, and it’s the part of bowling that most casual players overlook. You can knock down a perfect strike on the first ball, but if you leave a stubborn 7‑pin and can’t finish the frame, your score suffers. That’s why I’m writing this guide now – the league season is heating up, and every pin counts.

Why Spare Conversion Matters

A high spare percentage does three things for you:

Keeps your average steady – Even if you have an off‑day on the strike side, good spares protect your score.
Builds confidence – Knowing you can finish a frame makes you relax on the next throw.
Saves energy – You won’t be scrambling for a make‑up frame later in the game.

In short, a reliable spare ball is a secret weapon. Let’s break down how to pick the right one.

Step 1: Identify Your Spare Types

Not all spares are created equal. Most bowlers face three common patterns:

Single‑pin spares – The 7, 10, or any lone pin left after a strike.
Corner spares – The 1‑2‑4‑7 or 3‑5‑6‑10 clusters that sit near the gutter.
Split spares – The classic 7‑10 split or any two pins far apart.

Each pattern calls for a different ball reaction. A ball that slides straight is great for a 7‑pin, while a ball that hooks a little can help you angle into a corner spare.

Step 2: Look at the Core and Coverstock

Bowling balls have two main parts that affect how they move:

Core – The shape inside the ball. A symmetric core (like a sphere) rolls straight, while an asymmetric core (like a banana) creates a stronger hook.
Coverstock – The outer shell. A “plastic” cover rolls straight, a “urethane” gives a mild hook, and a “reactive resin” creates a strong hook.

For spare work, most coaches, including me at Pin Pursuit, recommend a ball with a plastic or low‑reactivity urethane coverstock and a symmetric core. That combo gives you a predictable, straight‑line path that’s easy to line up.

Step 3: Choose the Right Weight

A spare ball should feel comfortable enough to swing quickly and accurately. If you’re used to a 16‑lb strike ball, you might think a lighter spare ball will be easier, but that can throw off your timing. I usually suggest a ball that’s one to two pounds lighter than your regular strike ball. For most bowlers, that means a 14‑lb or 15‑lb spare ball.

Step 4: Pick a Finger Grip That Feels Natural

The grip on a spare ball is often tighter than on a strike ball because you want more control. A “finger tip” grip (where only the tips of your fingers go into the holes) works well for most players. It lets you release the ball cleanly without adding extra spin. If you already use a fingertip grip on your strike ball, keep it the same on the spare ball – consistency is key.

Step 5: Test the Ball on the Lane

Before you commit to a ball, take it for a quick test:

Find a lane with a dry surface – Most spare balls perform best on a slightly dry lane.
If you’re bowling on heavily oiled conditions, see our recommendations for heavy‑oil lane ball selection.
Throw a few single‑pin spares – Aim for the 7‑pin and 10‑pin from the same spot each time.
Watch the ball’s path – It should travel straight, hit the pin head‑on, and not bounce off the gutter.

If the ball hooks too much, swap the coverstock for a plastic version. If it slides too much and can’t hit a corner spare, consider a low‑reactivity urethane ball.

Step 6: Mark Your Ball

A simple visual cue can save you a lot of time during a tournament. I like to put a small piece of tape or a bright sticker on the ball’s side where I line up for a 7‑pin. That way, I don’t have to think about the exact spot each throw – I just line up the mark with the lane’s arrow.

Step 7: Practice the “Spare Routine”

Even the best ball won’t help if your approach is shaky. Here’s a quick routine I teach my students at Pin Pursuit:

Step 1 – Visualize – See the pin you’re targeting and picture the ball hitting it dead center. For a notoriously tough 7‑10 split, you can follow our detailed drill guide.
Step 2 – Align – Place your feet on the same board each time. Consistency beats power.
Step 3 – Release – Keep your hand low and your wrist firm. A clean release prevents unwanted spin.
Step 4 – Follow‑through – Let your arm swing straight toward the pins. A smooth finish keeps the ball on line.

Run through this routine for at least 30 minutes a week, focusing on different spare types. You’ll notice your conversion rate climb quickly.

Step 8: Keep an Eye on Lane Conditions

Lane oil changes throughout a session. A ball that works great on a fresh lane might slide too much on a heavily oiled lane. If you notice your spare ball losing traction, try a slightly higher‑recovery urethane coverstock. It will give you a tiny bit more hook without turning the ball into a strike ball.

Step 9: Rotate Your Spare Balls

If you bowl often, consider having two spare balls: one plastic for single‑pin spares and one low‑reactive urethane for corner spares. Switching between them is easy once you have the visual marks set up, and it gives you flexibility as lane conditions shift.

Step 10: Trust Your Feel, Not Just the Specs

All the technical talk about cores and coverstocks is useful, but the final decision comes down to how the ball feels in your hand. If a ball feels “right” and you’re hitting spares consistently, that’s the right ball for you. Don’t be afraid to try a new model if your current one stops delivering.

Choosing the right spare ball is a small investment that pays big dividends in your scores. By following these ten steps, you’ll walk into any league night or tournament with a clear plan, a reliable ball, and the confidence to finish every frame. Remember, the best bowlers aren’t the ones who strike the most—they’re the ones who never leave a pin standing.