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Oil Patterns Explained

Every competitive bowling event is played on a specific oil pattern. Understanding how patterns work is essential for shot selection, ball choice, and lane adjustment.

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1,100+ Patterns catalogued
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28–52 ft Distance range
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67 PBA patterns

What Oil Does to a Bowling Ball

Bowling lanes are coated with a thin layer of oil (conditioner) that reduces friction between the ball and the lane surface. This oil is applied in specific patterns that control where the ball skids, where it begins to hook, and how much it hooks.

Every bowling ball goes through three phases of motion: Skid (the ball slides on the oiled part of the lane), Hook (the ball begins to grip the lane as oil thins out), and Roll (the ball makes its final turn towards the pins).

The length, volume, and shape of the oil pattern determine exactly where those transitions happen. A longer pattern pushes the hook phase further down the lane. A heavier volume pattern means more skid and less overall hook. The ratio between oil in the centre and on the outside edges determines how forgiving the pattern is.

In competition, the oil pattern is one of the most critical variables. Two bowlers throwing the same ball on different patterns will see dramatically different ball motion.

How to Read a Pattern Sheet

Every pattern sheet provides three key numbers that tell you what to expect on the lanes:

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Distance (ft)

How far the oil extends down the lane from the foul line.

Short < 36 ft
Medium 36–41 ft
Long 42+ ft
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Volume (mL)

Total amount of oil applied to the lane surface.

Light < 14 mL
Medium 14–22 mL
Heavy 22+ mL
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Ratio (:1)

Oil in centre vs outside boards. Lower = harder.

Flat (Sport) < 3:1
Moderate 3–6:1
House 6:1+

House Shot vs Sport Pattern

House Shot

Typical centre conditions

  • arrow_right High ratio (6:1 or more) — heavy oil in the middle, dry outside
  • arrow_right Creates a "funnel" effect that guides the ball to the pocket
  • arrow_right Forgiving of accuracy errors — miss right and the ball hooks back
  • arrow_right What you'll encounter in recreational and league bowling

Sport Pattern

Competition conditions

  • arrow_right Flat ratio (under 3:1 per USBC definition) — even oil across the lane
  • arrow_right No forgiving "funnel" — accuracy and repeatability are critical
  • arrow_right Miss right and the ball stays right — no forgiveness
  • arrow_right What you'll bowl on at all Tenpin Ireland sanctioned events

The PBA Animal Patterns

The five signature PBA Tour patterns, each named after an animal and representing a different challenge.

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Cheetah

36 ft · 16.35 mL

Ratio: 2.8:1

High scoring, short

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Viper

39 ft · 26.5 mL

Ratio: 3.1:1

Heavy volume for length

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Chameleon

40 ft · 23.5 mL

Ratio: 3.1:1

Most forgiving of the five

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Bear

44 ft · 24 mL

Ratio: 2.7:1

Heavy oil, long

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Badger

52 ft · 29 mL

Ratio: 2.6:1

Longest and hardest

Tenpin Ireland Competition Patterns

These are the oil patterns currently in use across Tenpin Ireland events for the 2025/26 season.

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Kegel Navigation Bermuda

Senior Tour Ranked Events

41 ft 22.5 mL Ratio 3.5:1 Sport
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Kegel Beaten Path

National Championships 2026

39 ft 24.5 mL Ratio 4.2:1 Challenge
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ETBF Athens

Junior Irish Open

42 ft 25 mL Ratio 3.2:1 Sport
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WTBA Beijing

World Youth Championship Roll-Off

44 ft 26 mL Ratio 2.9:1 Sport

How Lanes Change During Play

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Carry-Down

As balls travel through the oil, they push conditioner further down the lane beyond the original pattern end point. This extends the effective pattern length, reducing backend hook reaction. The ball goes longer and hooks less.

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Track Burn

Repeated ball paths through the same area remove oil from the "track" zone (typically boards 8–15). This creates more friction in the track area, causing balls to hook earlier. Bowlers need to move inside or change ball surface.

Adjustments for Transition

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Move your feet — shift inside (left for right-handers) as the track dries up

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Change your ball — switch to a weaker ball or different surface as the pattern breaks down

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Adjust speed/angle — increase speed to combat early hook, or reduce angle

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The Rule of 31

A quick formula to estimate your breakpoint board.

Pattern Length − 31 = Breakpoint Board

36 ft − 31 = 5

Break at board 5 (near gutter)

40 ft − 31 = 9

Break at board 9 (moderate)

45 ft − 31 = 14

Break at board 14 (deep inside)

Caveat: The Rule of 31 is a starting point, not gospel. It breaks down on patterns with unusual volume, flat ratios, or asymmetric forward/reverse oil applications. Use it as your initial line, then adjust based on ball reaction.

How Oil Patterns Affect Ball Selection

Heavy Oil (22+ mL)

  • check Solid reactive coverstock
  • check Sanded/dull surface finish
  • check Strong core (low RG, high diff)

Medium Oil (14–22 mL)

  • check Hybrid coverstock
  • check Benchmark/versatile balls
  • check Medium core (mid RG)

Light/Dry (<14 mL)

  • check Pearl reactive or urethane
  • check Polished surface finish
  • check Mild core (higher RG)
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Explore the Full Pattern Library

Search over 1,100 oil patterns from PBA, USBC, ETBF, Kegel, and international competitions. Filter by distance, volume, difficulty, and organisation.

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