The official bowling rules used in Malaysian competition come from three rulebooks. The International Bowling Federation (IBF) sets the world playing rules, the USBC publishes the approved ball list that IBF events use, and the Malaysian Tenpin Bowling Congress (MTBC) adds national rules for its own events. On the core points, such as fouls, pinfall, ball weight and scoring, all three agree.
- Ball weight
- Max 16 lb (7.26 kg), no minimum
- Ball diameter
- 8.500 to 8.595 in (21.59 to 21.83 cm)
- Ball hardness (IBF)
- At least 72 on the Shore D scale
- Lane length
- 60 ft ± ½ in (18.29 m), foul line to head pin
- Lane width
- 41½ in ± ½ in (1.05 m)
- Pin weight
- 3 lb 6 oz to 3 lb 10 oz (1.53 to 1.65 kg)
Who writes the official bowling rules
Three bodies write the official bowling rules that matter to a Malaysian bowler. First, the International Bowling Federation publishes the Universal Playing Rules and the World Bowling Rules and Regulations. Its current rules document dates from September 2019, with changes added up to 2025. The IBF ran under the name World Bowling until November 2020.
Second, the United States Bowling Congress (USBC) publishes a yearly playing rulebook; the current edition covers 2026-2027. US leagues follow it directly. Elsewhere, it still matters because IBF rule 4.11.1 allows only balls on the USBC approved ball list in IBF-sanctioned events.
Third, the MTBC runs Malaysian national, state and international events such as the Malaysian International Open. It follows the world's official bowling rules and adds local ones on top. The MTBC also keeps the official averages, which it calculates from tournaments sanctioned by MTBC, the Asian Bowling Federation or the IBF.
Fouls and the foul line
Under both USBC Rule 5 and IBF Chapter 2, a foul happens when part of your body goes on or beyond the foul line and touches the lane, equipment or building. This applies during or after the delivery. Your shoes and clothing count as your body.
Some details of the official bowling rules on fouls surprise people:
- The foul line extends across the whole building, so leaning a hand on the ball return past the line still counts.
- Stepping over the line while you still hold the ball is not a foul, because no delivery has happened yet.
- Coins or pens that drop out of your pocket over the line don't cause a foul.
- Crossing onto the next approach isn't a foul either, unless you cross that lane's foul line too.
A foul still counts as a ball. You score zero for it, and after a first-ball foul the pins reset for your second ball. If you foul on purpose to get a fresh rack, USBC Rule 5b gives you zero and no further ball in that frame.
Legal and illegal pinfall
Legal pinfall covers pins knocked down by the ball or by other pins. It also includes pins that rebound off the side partitions, the rear cushion, or the sweep bar while it rests on the pin deck. Pins that lean against the kickback or partition also count. Bowlers call these leaning or fallen pins deadwood, and the machine must clear them before the next ball.
Illegal pinfall means the delivery counts but the pins don't. The main cases in the official bowling rules are:
- Your ball leaves the lane before reaching the pins, for example by jumping out of the gutter.
- The ball bounces back off the rear cushion and knocks pins over.
- Pinsetter machinery touches a pin, or a pin falls while staff remove deadwood.
- Deadwood left on the lane or in the gutter touches your ball, or it knocks down other pins.
- You foul.
When illegal pinfall happens on a first ball, the wrongly downed pins go back on their spots before your second ball.
Dead balls
A dead ball is different. The delivery doesn't count at all, and you bowl it again. Officials call a dead ball when a pin was missing from the rack, when you bowl on the wrong lane or out of turn, or when someone touches you during delivery. Speak up straight away, because the rules expect you to check the rack before you bowl.
Ball specifications and approved equipment
Every ball in sanctioned play must meet the size and weight limits in the official bowling rules. The maximum weight is 16 lb (7.26 kg), and there is no minimum. The diameter must sit between 8.500 and 8.595 inches, or a circumference of 26.704 to 27.002 inches. IBF rules also set a minimum surface hardness of 72 on the Shore D scale, and they ban softening the surface with chemicals.
Drilling rules matter too. The USBC rulebook allows a maximum of five gripping holes, one per finger and thumb, and it bans balance holes. In addition, every hole you drill must be used to grip the ball on every delivery. Your pro shop will know these limits, but it's worth asking if you buy a used ball with odd holes. Our drilling layouts guide explains why holes change ball motion.
In IBF events, players register their balls before official practice, up to a limit of six. Inspectors check the serial number, the approved list and the surface. From 1 January 2027, USBC rules also stop bowlers re-engraving the markings needed to identify a ball.
Lanes and pins
A lane runs 60 feet (18.29 m) from the foul line to the centre of the head pin, give or take half an inch. It measures 41.5 inches (1.05 m) wide, and the approach behind the line must be at least 15 feet (4.57 m) long. Pins weigh 3 lb 6 oz to 3 lb 10 oz and stand 15 inches (38 cm) tall. See our lane dimensions guide for the arrows, dots and oil.
Ball surface changes during competition
This is where the official bowling rules differ most between bodies, so check which rulebook your event uses.
| Situation | USBC (Rule 18) | IBF (rules 2.10, 4.10) |
|---|---|---|
| Before competition starts | Sand, polish or clean freely | Allowed |
| During a game | Not allowed | Not allowed; zero pinfall for that game |
| Between games | Not allowed once competition starts | Hand adjustments allowed in a designated area |
| Between rounds or blocks | Not allowed in the same event | Allowed in a designated area |
| Cleaners and chemicals | No liquid cleaners in play; approved cleaner only with an officer's consent | Only products on the IBF acceptable list |
| Rosin or powder on the ball | Not allowed | No foreign material on the ball |
You can still put rosin on your hand under USBC rules, as long as it leaves no residue on the ball. Likewise, wiping oil off with a dry towel is always fine. For more on keeping a ball in shape between sessions, see our bowling ball care guide.
MTBC rules: the 2026 urethane ban
On 27 January 2026, MTBC banned slow oil-absorbing high-performance urethane balls from all tournaments run by MTBC and its state affiliates, with immediate effect. The congress gave three reasons. These balls can break down lane oil patterns faster and create unequal conditions. They may also hold back the development of young bowlers. Finally, MTBC said some of these balls had tested below the allowed limits under IBF rules, and on-site testing isn't reliable.
MTBC said it consulted coaches, elite athletes and technical experts, and it considered USBC research. It also said it would keep monitoring and may review the rule. So before you enter a state or national event, check your ball's coverstock. Our bowling ball types guide explains urethane, reactive and plastic balls.
Tournament conduct and approaches
The official bowling rules also cover behaviour. For instance, both rulebooks ban putting powder, rosin or any slide product on your shoes if it transfers to the approach. Soft rubber heels that leave marks are banned for the same reason. Under the USBC rules, any bowler can ask you to stop using a slide product that makes the approach slippery.
Other points come up in event rules rather than the core playing rules:
- No smoking or alcohol: at IBF-approved tournaments, athletes must not use tobacco or drink during a block of games.
- Delay of play: USBC Rule 11 lets officials forfeit a game if a player refuses to continue.
- Dress code: the IBF recommends that every event sets one, so check the prospectus.
- Averages and clearance: bowlers without a valid MTBC average may have to enter the "Open" category at international events. Also, MTBC asks bowlers to request a clearance letter at least 14 days before an overseas sanctioned tournament.
Lane conditions also vary by event, so read the oil pattern sheet before you practise. Our oil patterns guide shows how to read one. For the polite side of the game, see our bowling etiquette guide, and for scoring basics go back to the bowling rules overview.
Where to read the full official bowling rules
The full IBF version of the official bowling rules sits on the IBF site under Resources. The USBC rulebook downloads as a free PDF from bowl.com, with question-and-answer notes under most rules. Meanwhile, MTBC posts its notices, averages and tournament rules on its website and Facebook page. If an event's prospectus disagrees with this summary, follow the prospectus and ask the tournament director.
Frequently asked questions
Is it a foul if you touch the foul line?
Touching the line itself isn't the test. You foul when part of your body goes on or over the line and touches the lane, equipment or building beyond it, during or after delivery. The foul line runs the full width of the building, walls and ball returns included. A foul delivery counts, but you get zero pins for it.
Can you change bowling balls during a game?
Yes. Neither the USBC nor the IBF rules stop you switching between your own legal balls mid-game, and most competitors use a separate spare ball. At IBF events, every ball must be registered first, with a limit of six. What you can't do is change a ball's surface during a game, and in USBC play not at all once competition starts.
Which governing body sets bowling rules in Malaysia?
The Malaysian Tenpin Bowling Congress (MTBC) runs national and state competition and adds its own rules, such as the 2026 urethane ball ban. For world events, the International Bowling Federation (IBF) rules apply. The USBC rulebook matters too, because its approved ball list is the one IBF events use.
What counts as legal pinfall?
Pins knocked down by your ball or by another pin count, including pins that bounce off the side partitions, back cushion or a resting sweep bar. Leaning pins that touch the kickback or partition also count as deadwood. However, pins don't count if your ball left the lane first, rebounded from the cushion, or if the pinsetter knocked them down.
Are there rules on bowling ball surface changes during competition?
Yes, and they differ. USBC Rule 18 bans abrasives, cleaners and foreign substances once competition starts, even on balls you haven't thrown yet. IBF rules allow hand surface adjustments between games in a designated area, but changing the surface during a game costs you zero pinfall for that game.
