The regulatory range — what the FIPJP rules say
The FIPJP rules set the diameter limits of an approved boule between 70.5 mm and 77.5 mm. Within this 7 mm range, the player is entirely free. The accepted manufacturing tolerance is generally ±0.5 mm around the nominal diameter engraved on the boule.
📐 REGULATORY RANGE — AVAILABLE DIAMETERS 70.5 Legal minimum 71 Very small 71.5 Small 72 Small standard 73 Common range 74 Common range 75.5 Large 77.5 Legal maximum Small range (70.5–71.5 mm) Common range (72–74 mm) Large range (75–77.5 mm) 📏The diameter is engraved on each boule along with the weight — for example "720-73" means 720 grams, 73 mm. In competition, the umpire can check these data with a gauge. A boule outside the tolerance (diameter less than 70.5 mm or greater than 77.5 mm even by a tenth of a mm) is excluded from play. The check is not systematic but it can be requested by the opposing team — that is why FIPJP approval is the only real guarantee.
What the diameter changes physically
Diameter is not only a matter of comfort in the hand. It alters several physical parameters of the game — some directly, others indirectly via the grip.
🖐️ Contact surface in the handA larger diameter increases the contact surface between the boule and the fingers — and therefore the grip friction. A 77 mm boule held by large hands is more stable than a 71 mm boule for the same player. Conversely, small hands on a large boule tense up to compensate for the lack of natural grip.
Grip stability ∝ hand/diameter match 🎯 Contact point at releaseReleasing a larger boule involves more spread fingers — the boule "rolls" differently over the ends of the fingers. A boule that is too large for the hand leaves the fingers in a less centred way, creating lateral micro-deviations imperceptible throw by throw but visible over 20 throws.
Unsuitable diameter = off-centre release ⚡ Ground contact zone on impactA larger boule has a higher radius of curvature — at the moment of impact on the ground, the effective contact zone is slightly different. This effect is minimal but can affect how the boule "grips" the terrain on landing, especially on an irregular surface.
Slightly different radius of curvature 👁️ Visibility on the groundA larger boule is more visible from the throwing circle. On a dark terrain or one of a similar colour to the boule, a few extra millimetres of diameter can make the difference in the visual assessment of the position. This parameter matters mainly for the visual umpiring of close positions.
+7 mm diameter = +21 mm visible circumference ⚖️ Weight/volume ratioAt equal weight, a larger-diameter boule is less dense — the steel is more hollow or the alloy slightly different. This has practically no measurable effect on the game, but means that two boules of the same weight in the hand can feel slightly different in perceived density depending on their diameter.
Negligible effect in practice 🔄 Moment of inertia in rotationA larger boule has a higher moment of inertia — it resists changes in rotation more. This can mean that a backspin applied at release dissipates more slowly on a large boule. A very subtle effect, difficult to perceive in real play.
Effet perceptible uniquement à haut niveauSmall diameter vs large diameter — the compared effects
🔵 PETIT DIAMÈTRE (70,5–72 mm) →Prise naturelle pour les petites mains — les doigts enveloppent bien →Lâcher plus précis pour les joueurs à petite morphologie de main →Moins visible au sol — peut compliquer l'appréciation visuelle des positions proches →Zone de contact au sol légèrement réduite — moins de friction au roulement →Prise instable pour les grandes mains — les doigts se positionnent maladroitement →Au tir : boule cible plus difficile à "couvrir" — zone d'impact effective plus petite →Recommandé pour les joueurs avec une tour de main inférieure à 19–20 cm 🟠 GRAND DIAMÈTRE (75–77,5 mm) →Prise naturelle pour les grandes mains — meilleure stabilité →Plus visible au sol — avantage pour les litiges visuels →Surface de contact au sol légèrement plus grande — friction accrue au roulement →Prise crispée pour les petites mains — créé une tension dans les doigts →Au tir : zone d'impact légèrement plus grande — plus de tolérance à l'imprécision →Plus difficile à tenir par temps chaud (main qui gonfle légèrement) →Recommandé pour les joueurs avec une tour de main supérieure à 21 cm 🎙️ Paquita sur le diamètre et la main "J'ai travaillé pendant des années avec des boules de 74 mm. Mon lâcher était propre mais j'avais cette légère sensation que la boule ne partait pas exactement là où mes doigts voulaient l'envoyer. En testant des 72 mm, j'ai compris — mes mains sont petites, les 74 mm me forçaient à écarter légèrement les doigts au-delà de leur position naturelle. Le lâcher était micro-décalé. Passer à 72 mm a réglé ce problème en deux sessions. Le diamètre n'est pas un détail — c'est la fondation de la relation entre votre main et votre boule." — PaquitaMorphology and ideal diameter
The main criterion for choosing your diameter is the size of the hand — more precisely the perimeter of the palm (hand circumference) and the length of the fingers. These two measurements determine which size of boule wraps naturally in the hand without forcing.
CRITERION 1 📏 Hand circumferenceThe main measurement. Wrap a flexible tape measure around the palm, at the level of the finger joints (just below the first phalanges). Hand circumference under 19 cm → 71–72 mm. Between 19 and 21 cm → 72–74 mm. Over 21 cm → 74–77 mm.
Universal basic criterion CRITERION 2 🖐️ Finger lengthLong fingers make it easier to wrap around a large-diameter boule — the tips stay in stable contact. Short fingers tend to "fall" inside the boule on large diameters, creating an unstable release.
Short fingers → smaller diameter CRITERION 3 👫 Gender and general buildWomen statistically have smaller hands — most female players go for 71–73 mm. Large-built men towards 74–76 mm. These are only starting points — the hand circumference measurement remains the objective criterion.
Statistical starting point, not an absolute rule CRITERION 4 👴 Age and osteoarthritisWith age, fingers may swell slightly (osteoarthritis, water retention). Some veterans who played with 75 mm switch to 73 mm to regain a more comfortable grip. Finger joint stiffness can also steer towards a slightly smaller diameter.
Osteoarthritis → consider going down CRITERION 5 🌡️ Season — hands swell in summerIn intense heat, hands swell slightly — finger volume increases by about 1 to 2%. A 75 mm boule that feels comfortable in winter may seem too tight in a heatwave. Some players have a slightly smaller-diameter boule for summer.
Hot summer → consider -0.5 mm CRITERION 6 🔄 Grip feel — the final judgeNo measurement replaces the actual feel. Hold 3 boules of different diameters in your normal playing grip, perform 5 swings, and note which one offers the most natural sensation of control without conscious effort. The right boule holds without thinking.
Test physique > toute mesureDiameter according to role: shooter vs pointer
The question of diameter according to role is subtle — there is no difference as marked as with hardness or weight. However, certain logic applies.
🎯 Shooter — a slight advantage to large diameterWhen shooting, the boule must strike the opposing boule precisely. A slightly larger boule offers a slightly wider contact zone — the impact error margin is larger. On a shot that passes 3 mm beside a small boule, a larger boule can still graze the target. This advantage is subtle but real for shooters who have "good but imperfect" accuracy. High-level shooters sometimes prefer to stick with a diameter suited to their hand rather than chase this marginal advantage with an uncomfortable diameter.
📍 Pointer — release precision comes firstFor the pointer, the quality of the release is the most critical variable. A diameter perfectly suited to the hand ensures a regular and precise release end after end. A diameter that is too large forces the hand to compensate — and this compensation introduces micro-variations in the release that translate into dispersion on the final distance. The pointer should prioritise hand/diameter fit over any other criterion.
Interaction between opposing diameters on impact
During a shot, the shooter's boule strikes the opposing boule. The relative diameter of the two boules slightly alters the geometry of the impact and the resulting direction of movement.
📐 GÉOMÉTRIE DU CHOC SELON LES DIAMÈTRES RELATIFS Même diamètre75 mm vs 75 mm Choc frontal symétrique. Direction de déplacement prévisible et stable. Neutre Lancée plus grande
77 mm vs 71 mm Point de contact légèrement décalé vers le bas. La petite boule adverse peut partir légèrement vers le haut. Avantage tireur Lancée plus petite
71 mm vs 77 mm Contact point offset upwards. The small thrown boule may bounce upwards off the large target. Slight loss of efficiency These effects are subtle on differences of 2–3 mm — much more visible at the extremes of the range (71 mm vs 77 mm) ⚡
The difference in behaviour at impact between two extreme diameters (71 mm vs 77 mm) is more visible on off-centre shots (not exactly head-on) than on frontal shots. A side shot on a small opposing boule with a large boule can create a different lateral deflection effect than an equivalent shot with two boules of the same diameter. This is useful knowledge for expert shooters who anticipate the post-shot effect on nearby boules.
The grip test — finding your diameter
🖐️ PROTOCOLE DE TEST 3 tests pour identifier son diamètre idéal 1 Test des jointures — mesure objective Mesurez votre tour de main (mètre souple autour de la paume, sous les jointures des doigts). Utilisez le tableau : moins de 19 cm → diamètre 71–72 mm / 19–21 cm → 72–74 mm / plus de 21 cm → 74–77 mm. C'est le point de départ objectif. 2 Test du balancement — sensation de contrôle Tenez une boule de votre diamètre candidat dans votre prise de jeu. Effectuez 5 balancements au ralenti. Vérifiez : les doigts restent-ils en contact stable avec la boule tout au long du mouvement ? La boule "glisse-t-elle" latéralement dans la main pendant le balancement ? Si oui — le diamètre est trop grand. Si vous sentez une tension pour maintenir la prise — trop grand aussi. La bonne taille ne demande aucun effort de maintien. 3 Test de la précision sur 20 lancers Sur un cochonnet à 7 mètres, lancez 20 boules avec votre diamètre habituel, notez la dispersion. Recommencez avec un diamètre différent de 1 à 2 mm. Si la dispersion est nettement inférieure avec le nouveau diamètre — vous avez trouvé quelque chose. Si les deux dispersions sont similaires — votre diamètre actuel est déjà adapté. Ce test nécessite d'emprunter des boules de diamètre différent chez des partenaires.The myths about diameter
❌ MYTHE ✓ RÉALITÉ ❌"Plus grand est mieux — une boule plus grande est plus stable." ✓La stabilité dépend de l'adéquation entre la taille de la main et le diamètre. Une boule trop grande pour la main est moins stable qu'une boule parfaitement adaptée — même si elle serait stable pour quelqu'un d'autre. ❌"Le diamètre n'a pas d'importance — seuls le poids et la dureté comptent." ✓Le diamètre détermine la qualité de la prise en main, qui conditionne directement la précision du lâcher. Sur ce critère, il a autant d'importance que le poids pour certains joueurs. C'est le paramètre le plus souvent négligé — pas parce qu'il est sans effet, mais parce que son effet est moins spectaculaire à court terme. ❌"Le diamètre influe sur la distance de roulement — une boule plus grande roule plus loin." ✓Faux — sur une surface donnée, à même vitesse et même angle, le diamètre n'a pratiquement pas d'effet sur la distance de roulement. La physique du roulement dépend de la vitesse, de la friction et de la masse — pas du diamètre seul. ❌"Les femmes doivent toujours jouer en petit diamètre." ✓Les femmes ont statistiquement des mains plus petites — mais il existe des femmes avec de grandes mains qui jouent parfaitement en 74–75 mm, et des hommes avec de petites mains qui jouent en 71–72 mm. Le tour de main est le critère objectif, pas le genre. ❌"Changer de diamètre est une décision majeure qui perturbe durablement le jeu." ✓Un changement de diamètre de 1 à 2 mm demande 3 à 6 sessions d'adaptation — une durée très courte comparée à un changement de poids ou de dureté. La mémoire musculaire s'adapte rapidement au diamètre parce que la main "ressent" immédiatement le bon ajustement.Summary table by profile
| Profile | Recommended diameter | Main rationale | Also to test |
|---|---|---|---|
| Woman — standard hands | 71–73 mm | Natural grip, precise release without effort | 72 mm as a universal starting point |
| Man — average build | 72–74 mm | Comfort zone of the majority of male players | 73 mm — the most common "universal" diameter |
| Man — large hand | 74–76 mm | Grip stability on large diameter | 74 mm to start, 75 if fingers are long |
| Beginner — all builds | 72–74 mm | Versatile mid-range zone, learning without constraint | Adjust after 2–3 months of regular practice |
| Veteran with osteoarthritis | 71–72 mm | Reduce finger joint strain | Go down gradually if pain persists |
| Shooter — large hands | 75–77 mm | Slightly wider contact zone at impact | Do not exceed grip comfort for this marginal benefit |
| Pointer — precision paramount | Diameter perfectly suited to the hand | Release quality takes priority over any other criterion | Dispersion test over 20 throws to confirm |
| Youth player (minime/cadet) | 70.5–71.5 mm | Hands still developing, smaller grip | Reassess each season — hands grow quickly |
Diameter, weight, hardness, grooving — the four parameters of boule choice in their overall coherence. Paquita's book pairs the right equipment with the right technique with 100 numbered drills.
📦 Order on AmazonFAQ — Your frequent questions
No — a single player's three boules must be identical in weight, diameter, hardness and model, as engraved and approved. A player cannot play with two 73 mm boules and one 74 mm boule, even from the same brand. On the other hand, in a triplette team, each player may have their own boules with their own diameter — the shooter in 75 mm, the middle in 73 mm, the pointer in 71 mm. Each player plays with their own approved boules. Three practical methods. 1) Read the diameter engraved directly on the boule — it is generally indicated with the weight (e.g.: "720-73" = 720g, 73mm). 2) Measure with a calliper if you have one — the most precise measurement. 3) Sandwich the boule between two books or two flat surfaces and measure the distance between them with a ruler — an approximate method but sufficient to distinguish a 71 mm from a 75 mm. For an official check (dispute in a competition), only the umpire's calliper is authoritative. Marginally. Normal wear from friction and impacts removes a few hundredths of a millimetre over several years of intensive practice. Over 5 to 10 years, a regularly used boule may lose 0.1 to 0.2 mm in diameter — which remains within manufacturing tolerances and is not perceptible in play. What changes more visibly is the local surface geometry (impact marks, chipping) — but the average diameter remains stable. A boule showing marks that locally reduce its diameter below 70.5 mm may theoretically be refused, but this is extremely rare in practice. Pas nécessairement — les deux paramètres sont indépendants dans la gamme réglementaire. Une boule de 750g peut faire 71 mm (acier très dense) ou 77 mm (alliage moins dense, éventuellement creux intérieur). La combinaison poids/diamètre est un choix de fabricant, et dans certaines limites, un choix du joueur. Des boules très denses à petit diamètre existent — elles sont moins courantes mais tout à fait réglementaires. En pratique, les gammes standards des fabricants proposent souvent des combinaisons "logiques" (poids plus lourd = diamètre légèrement plus grand) mais sans obligation physique ou réglementaire. 📎 Articles liés Equipment Choosing your boules — complete guide 2026 Equipment Stainless steel vs carbon — complete comparison Equipment Top 3 best shooter boules 2026 Equipment Checking the FFPJP approval of your boules Video Why changing bowls does not change your level Tools Free PetanqueLand tools© Pétanque by Paquita — petanqueland.fr ·
📖 Paquita's book on Amazon
The recommended diameter ranges are estimates based on average body types — the physical in-hand test remains the absolute reference for the final choice.