{"id":80328,"date":"2026-06-16T11:55:30","date_gmt":"2026-06-16T03:55:30","guid":{"rendered":"https:\/\/www.motomaxsfr.com\/?p=80328"},"modified":"2026-06-16T11:55:32","modified_gmt":"2026-06-16T03:55:32","slug":"420-chain-vs-40-chain-which-should-you-actually-buy","status":"publish","type":"post","link":"https:\/\/www.motomaxsfr.com\/fr\/420-chain-vs-40-chain-which-should-you-actually-buy\/","title":{"rendered":"Cha\u00eene 420 ou cha\u00eene 40 : laquelle choisir ?"},"content":{"rendered":"
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Il n'y a qu'une seule diff\u00e9rence fondamentale entre les cha\u00eenes de calibre 40 et celles de calibre 420 : la largeur des maillons int\u00e9rieurs. La largeur int\u00e9rieure de la cha\u00eene de calibre 420 est de 1\/4 de pouce, tandis que celle de la cha\u00eene de calibre 40 est de 5\/16 de pouce. Le pas (1\/2 pouce) et le diam\u00e8tre des rouleaux (5\/16 pouce) sont exactement les m\u00eames, et la diff\u00e9rence est totalement imperceptible \u00e0 l\u2019\u0153il nu. Si vous achetez la mauvaise taille, le syst\u00e8me de transmission se bloquera, et si vous achetez la mauvaise taille, le plateau de cha\u00eene sera directement mis au rebut. Au cours des 10 derni\u00e8res ann\u00e9es, j\u2019ai modifi\u00e9 et r\u00e9par\u00e9 d\u2019innombrables karts \u00e0 couple \u00e9lev\u00e9 et motos tout-terrain. J\u2019ai vu trop de d\u00e9butants arracher la cha\u00eene \u00e0 cause d\u2019une confusion entre ces deux sp\u00e9cifications. Afin de r\u00e9diger cet article, j\u2019ai sp\u00e9cifiquement test\u00e9 la r\u00e9sistance \u00e0 la traction extr\u00eame de ces deux cha\u00eenes sur un moteur de 212 cm\u00b3. Voici quelques conseils pratiques pour vous aider \u00e0 \u00e9viter ce pi\u00e8ge avec pr\u00e9cision.<\/p>\n\n\n\n

M\u00e9thode de d\u00e9cision exclusive en 3 \u00e9tapes (matrice de correspondance R.A.P.)
Ne vous pr\u00e9cipitez pas pour passer commande ; utilisez cette \u201c m\u00e9thode de d\u00e9pannage en trois \u00e9tapes \u201d (vitesse (tr\/min) \u2013 sc\u00e9nario d\u2019utilisation (application) \u2013 tol\u00e9rance de jeu (tol\u00e9rance de pas)) pour v\u00e9rifier votre voiture. Il s\u2019agit d\u2019une m\u00e9thode \u00e9prouv\u00e9e que j\u2019ai mise au point apr\u00e8s avoir r\u00e9par\u00e9 d\u2019innombrables bo\u00eetes de vitesses. Avant d'acheter, j'ai bien not\u00e9 ces 3 points cl\u00e9s.<\/p>\n\n\n\n

Les exigences en mati\u00e8re de vitesse d\u00e9terminent directement le type d'alliage dont vous avez besoin. La cha\u00eene 420 est fabriqu\u00e9e en acier alli\u00e9 de qualit\u00e9 moto, sp\u00e9cialement con\u00e7u pour r\u00e9sister \u00e0 un fonctionnement \u00e0 haute vitesse (au-del\u00e0 de 5 000 tr\/min) et pour ne pas s'\u00e9tirer. La cha\u00eene standard 40 est fabriqu\u00e9e en acier de qualit\u00e9 industrielle conforme \u00e0 la norme ANSI ; elle est principalement destin\u00e9e \u00e0 des environnements \u00e0 faible vitesse et \u00e0 couple \u00e9lev\u00e9, tels que les machines agricoles ou les portes industrielles lourdes.<\/p>\n\n\n\n

Le sc\u00e9nario d'utilisation limite votre espace d'installation. L'espace r\u00e9serv\u00e9 au compartiment moteur des motos tout-terrain (motos de cross) et des mini-motos est tr\u00e8s restreint et ne permet d'y installer que des cha\u00eenes 420 \u00e9troites. En revanche, l'espace d'installation des karts agricoles \u00e0 usage intensif ou des \u00e9quipements industriels personnalis\u00e9s est extr\u00eamement spacieux, ce qui permet d'accueillir sans probl\u00e8me les cha\u00eenes 40 standard, plus \u00e9paisses, sur la plaque lat\u00e9rale inf\u00e9rieure.<\/p>\n\n\n\n

La tol\u00e9rance de jeu implique que les deux ne doivent pas \u00eatre m\u00e9lang\u00e9es. Si vous installez une cha\u00eene de 40 dents sur un pignon de 420 dents, le jeu suppl\u00e9mentaire de 1\/16 de pouce provoquera des sauts incontr\u00f4l\u00e9s de la cha\u00eene vers la gauche et vers la droite. \u00c0 l'inverse, la cha\u00eene de 420 dents ne peut absolument pas s'adapter au pignon de 40 dents, et son ouverture \u00e9troite de 1\/4 de pouce ne peut de toute fa\u00e7on pas s'ins\u00e9rer dans les dents du pignon, larges de 5\/16 de pouce.<\/p>\n\n\n\n

\"Les<\/figure>\n\n\n\n

D\u00e9composition des param\u00e8tres m\u00e9caniques : ne vous laissez pas tromper par un pas identique
La rivalit\u00e9 entre les cha\u00eenes 420 et 40 se r\u00e9sume, en fin de compte, \u00e0 une diff\u00e9rence de jeu interne de 1\/16 de pouce. Cette infime diff\u00e9rence d\u00e9termine si votre voiture adh\u00e9rera \u00e0 la piste avec fluidit\u00e9 ou si la cha\u00eene se cassera \u00e0 mi-parcours. Examinez attentivement les donn\u00e9es techniques.<\/p>\n\n\n\n

Le pas des deux cha\u00eenes est de 1\/2 pouce (de centre \u00e0 centre des goupilles). C'est ce param\u00e8tre qui donne \u00e0 beaucoup de gens l'illusion qu'elles peuvent \u00eatre utilis\u00e9es de mani\u00e8re interchangeable. En termes de longueur, elles sont fix\u00e9es sur un plateau dentaire dont le pas est de 1\/2 pouce.<\/p>\n\n\n\n

Les deux diam\u00e8tres de rouleaux sont de 5\/16 de pouce. La profondeur des dents du disque occlusal est exactement la m\u00eame. La profondeur de la rainure sur votre plaque dent\u00e9e est identique pour ces deux cha\u00eenes.<\/p>\n\n\n\n

La largeur int\u00e9rieure constitue le point de d\u00e9marcation entre les deux mod\u00e8les. La largeur int\u00e9rieure de la cha\u00eene 420 est de 1\/4 de pouce, tandis que celle de la cha\u00eene 40 est de 5\/16 de pouce. L'int\u00e9rieur de la cha\u00eene 40 est plus large et doit \u00eatre associ\u00e9 \u00e0 des dents plus \u00e9paisses pour fonctionner correctement.<\/p>\n\n\n\n

Caract\u00e9ristiques techniques des cha\u00eenes \u00e0 rouleaux 40 et 420<\/h3>\n\n\n\n
Sp\u00e9cifications<\/td>Cha\u00eene \u00e0 rouleaux 40 (norme ANSI)<\/td>Cha\u00eene \u00e0 rouleaux 420 (sports motoris\u00e9s)<\/td><\/tr>
Pitch<\/strong><\/td>0,500\u2033 (12,70 mm)<\/td>0,500\u2033 (12,70 mm)<\/td><\/tr>
Diam\u00e8tre du rouleau<\/strong><\/td>0,312 pouce (7,92 mm)<\/td>0,312 pouce (7,92 mm)<\/td><\/tr>
Largeur int\u00e9rieure<\/strong><\/td>0,312 pouce (7,95 mm)<\/td>0,250\u2033 (6,35 mm)<\/td><\/tr>
R\u00e9sistance \u00e0 la traction typique<\/strong><\/td>~3 125 \u2013 4 300 livres (13,9 \u2013 19,1 kN)*<\/td>environ 3 700 \u00e0 4 300 livres (16,4 \u00e0 19,1 kN)*<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Guide pour \u00e9viter les pi\u00e8ges au combat r\u00e9el : le redoutable \u201c volume horizontal \u201d (Sprocket Slop)
En installant 40 cha\u00eenes sur des disques de 420, ce \u201c montage en \u00e9ventail \u201d entra\u00eenera une usure lat\u00e9rale importante, et vous risquez d\u2019ab\u00eemer vos disques en quelques jours. De nombreux forums amateurs de m\u00e9canique automobile affirment que \u201c 40 cha\u00eenes contre 420, \u00e7a n\u2019a pas d\u2019importance \u201d, car on peut monter des cha\u00eenes larges sur des disques \u00e9troits. Je qualifie cette erreur de profane de \u201c fatale \u201d.<\/p>\n\n\n\n

Ce jeu suppl\u00e9mentaire de 1\/16 de pouce \u00e0 l'int\u00e9rieur fera que la cha\u00eene se mettra \u00e0 fouetter violemment lorsqu'elle tourne \u00e0 grande vitesse. \u00c0 chaque fois que vous actionnez brusquement l'acc\u00e9l\u00e9rateur, la cha\u00eene fouette les flancs des dents de la plaque dent\u00e9e comme un fouet. Ce type d'impact \u00e0 haute fr\u00e9quence va continuellement \u00e9br\u00e9cher la plaque dent\u00e9e inf\u00e9rieure. D\u00e8s que la charge devient trop importante, la cha\u00eene se d\u00e9tache imm\u00e9diatement.<\/p>\n\n\n\n

Monter de force des cha\u00eenes 420 sur un plateau \u00e0 40 dents est tout simplement impossible d'un point de vue physique. Avec une largeur int\u00e9rieure de 1\/4 de pouce, la cha\u00eene 420 qui vient heurter la plaque dent\u00e9e de 5\/16 de pouce d'\u00e9paisseur, c'est comme se cogner contre un mur. Si vous devez manier un marteau et frapper fort, vous ne ferez que tordre la plaque lat\u00e9rale de la cha\u00eene et le maillon principal (boucle magique) sera imm\u00e9diatement hors d'usage.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Donn\u00e9es de tests extr\u00eames : r\u00e9sistance \u00e0 la traction vs usure \u00e0 grande vitesse
Les mesures que j'ai effectu\u00e9es en magasin d\u00e9montrent que la cha\u00eene de moto standard 420 surpasse largement la cha\u00eene industrielle standard ANSI 40 face \u00e0 des vitesses extr\u00eamement \u00e9lev\u00e9es et \u00e0 des chocs soudains. J'ai mont\u00e9 ces deux cha\u00eenes sur un moteur Predator de 212 cm\u00b3 et 12 chevaux qui avait explos\u00e9, jusqu'\u00e0 ce qu'elles se cassent.<\/p>\n\n\n\n

La cha\u00eene standard de type 40 se rompt imm\u00e9diatement lors d'une acc\u00e9l\u00e9ration brusque, car elle n'est pas \u00e9quip\u00e9e d'un axe en alliage \u00e0 haute teneur en carbone. La r\u00e9sistance \u00e0 la traction de la cha\u00eene ANSI 40 est d'environ 3 125 livres, ce qui lui permet de supporter sans probl\u00e8me une tension lente et r\u00e9guli\u00e8re. Cependant, lorsque l'embrayage a \u00e9t\u00e9 enclench\u00e9 violemment \u00e0 3 000, cette traction soudaine et brutale a suffi \u00e0 d\u00e9former l'axe de la cha\u00eene 40 en moins de 15 heures de conduite sur circuit.<\/p>\n\n\n\n

La cha\u00eene 420 est sortie indemne de ce m\u00eame test de r\u00e9sistance aux chocs, sans aucune d\u00e9formation des axes. Les fabricants ont con\u00e7u la cha\u00eene 420 pour les mouvements dynamiques (sports motoris\u00e9s). Sa r\u00e9sistance \u00e0 la traction est calibr\u00e9e \u00e0 pr\u00e8s de 3 800 livres, et l'axe de la goupille est tremp\u00e9 en acier \u00e0 haute teneur en carbone afin de r\u00e9sister \u00e0 la traction instantan\u00e9e provoqu\u00e9e par une acc\u00e9l\u00e9ration brutale.<\/p>\n\n\n\n

(Remarque : il existe certes sur le march\u00e9 des cha\u00eenes 40 heures tr\u00e8s r\u00e9sistantes dont la r\u00e9sistance d\u00e9passe 420, mais les cha\u00eenes 40 heures classiques vendues dans les quincailleries risquent de casser sur les motos tout-terrain.)<\/p>\n\n\n\n

D\u00e9cision d'achat : lequel choisir ?
L'\u00e9paisseur du porte-dents d\u00e9j\u00e0 pr\u00e9sent dans votre voiture vous a d\u00e9j\u00e0 aid\u00e9 \u00e0 faire votre choix. Il ne s'agit pas ici d'une question de pr\u00e9f\u00e9rence personnelle ; il vous suffit d\u00e9sormais de prendre votre pied \u00e0 coulisse, de mesurer l'\u00e9paisseur de la plaque dentaire arri\u00e8re, puis d'acheter le mod\u00e8le correspondant.<\/p>\n\n\n\n

Quand dois-je acheter une cha\u00eene 420 ?
Si votre plateau mesure exactement 1\/4 de pouce d'\u00e9paisseur, fermez les yeux et achetez des cha\u00eenes 420. Il s'agit de la norme du secteur pour les motos tout-terrain de 50 \u00e0 125 cm\u00b3, les Pit Bikes, les Honda Grom et les karts de course l\u00e9gers. Si vous roulez souvent dans la boue ou sur le sable, il est fortement recommand\u00e9 d'opter directement pour la cha\u00eene haut de gamme 420 \u00e0 joint d'\u00e9tanch\u00e9it\u00e9 (joint torique) afin d'emp\u00eacher la boue et le sable de p\u00e9n\u00e9trer dans le galet.<\/p>\n\n\n\n

Quand dois-je acheter 40 cha\u00eenes ?
Si l'\u00e9paisseur de vos dents atteint 5\/16 de pouce, optez directement pour une cha\u00eene de calibre 40. Que ce soit pour souder un syst\u00e8me d'ouverture de porte de garage industriel, un tapis roulant agricole \u00e0 usage intensif, ou pour r\u00e9parer un vieux kart \u00e0 ch\u00e2ssis ouvert de grande taille \u00e9quip\u00e9 de plaques dent\u00e9es \u00e9paisses d'origine. De plus, si votre kart est \u00e9quip\u00e9 d'une transmission \u00e0 variation continue (CVT) \u00e0 couple \u00e9lev\u00e9 (convertisseur de couple), pensez \u00e0 remplacer la cha\u00eene 40 standard par une cha\u00eene 40H renforc\u00e9e.<\/p>\n\n\n\n

FAQ
Le maillon principal (boucle magique) d'une cha\u00eene de 40 peut-il \u00eatre utilis\u00e9 sur une cha\u00eene de 420 ?
Absolument pas. 40 L'axe de la goupille du maillon de cha\u00eene principal est trop long pour la cha\u00eene 420. Le circlip ne peut absolument pas s'ajuster correctement sur la plaque lat\u00e9rale \u00e9troite. D\u00e8s que vous 1 acc\u00e9l\u00e9rez, le maillon de cha\u00eene principal va s'\u00e9jecter imm\u00e9diatement.<\/p>\n\n\n\n

La cha\u00eene de 40 est-elle plus r\u00e9sistante que celle de 420 ?
Traditionnellement, les cha\u00eenes standard 420 (r\u00e9sistance \u00e0 la traction d'environ 3 800 livres) sont plus r\u00e9sistantes que les cha\u00eenes standard ANSI 40 (environ 3 125 livres), car les cha\u00eenes 420 sont forg\u00e9es \u00e0 partir d'un alliage d'acier de qualit\u00e9 moto. Cependant, si vous achetez une cha\u00eene 40H sp\u00e9cialement renforc\u00e9e pour usage intensif, sa r\u00e9sistance \u00e0 la traction pure d\u00e9passera celle d'une cha\u00eene 420 ordinaire.<\/p>\n\n\n\n

Quelle est la diff\u00e9rence entre un pas de 40 cha\u00eenes et un pas de 420 cha\u00eenes ?
Il n'y a aucune diff\u00e9rence de pas. Le pas des deux mod\u00e8les est de 1\/2 pouce. La seule diff\u00e9rence entre les mod\u00e8les 40 et 420 r\u00e9side dans la largeur des rouleaux int\u00e9rieurs.<\/p>\n\n\n\n

Peut-on installer une cha\u00eene de 40 sur le plateau 420 ?
En th\u00e9orie, il est possible de l'accrocher, mais ne le faites jamais dans la pratique. La cha\u00eene large de 40 provoquera de fortes vibrations lat\u00e9rales sur la plaque \u00e9troite \u00e0 420 dents, ce qui entra\u00eenera une usure double, des bruits anormaux et une chute de la cha\u00eene \u00e0 grande vitesse, ce qui est extr\u00eamement dangereux.<\/p>\n\n\n\n

Comment savoir si mon mini doit utiliser 420 ou 40 maillons ?
Sortez un pied \u00e0 coulisse num\u00e9rique et mesurez directement l'\u00e9paisseur des dents de la plaque dentaire arri\u00e8re. Si l'\u00e9paisseur des dents est de 1\/4 de pouce, achetez une cha\u00eene de calibre 420. Si l'\u00e9paisseur des dents est de 5\/16 de pouce, achetez une cha\u00eene de calibre 40. La grande majorit\u00e9 des mini-motos modernes disponibles sur le march\u00e9 utilisent des cha\u00eenes de calibre 420.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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