Il s'agit du nombre de trous (bleu) X le diamètre (Jaune) en millimètre d'un cercle imaginaire qui passerait par le milieu de ces trous.
Ici une Jante ATS "Classic" en 4X100.

Opel en 4 trous : 4 X 100
Opel en 5 trous : 5 X 120 puis 5 X 110 (depuis l'Omega A) puis de nouveau 5x120 (vers 2008)
Le Diamètre:
Exprimé en Pouce (ou inch en Anglais)
1 Pouce = 2.54 centimètres.
Sur nos Opel anciennes il est généralement de 13" ou 14"
La Largeur
Également exprimé en Pouce, sur nos Opel les largeurs d'origine sont de 5 à 6 pouces
Le Déport (ET)
De l'allemand : "Einpresstiefe" c'est la distance (en mm) entre le centre de la jante et son point d'appui sur le tambour, moyeu ou disque, voici la formule de calcul et un schéma (mais il est souvent gravé sur la Jante)


6 trous
6 on 5-1/2"
Chevrolet - all to '48
Chevy/GMC - P.U., van to '70
- 4x4 P.U., Blazer '71-'89
- LUV 2WD '72-'84
Dodge - D-50, Ram 50 P.U. '79-'87
Ford - Courier PU '72-'84
Mazda - P.U. '72-'89
Nissan/Datsun - P.U., Pathfinder '67-'89
Toyota - SR5, 4WD P.U., Landcruiser, 4-Runner (some) to '89
5 trous
5 X 100mm
Buick - Century, Skylark, Skyhawk FWD '79-'87
- LeSabre, Riviera, Somerset '85-'88
Chevrolet - Beretta, Citation, Cavalier, Celebrity, Corsica
'80-'89
Chrysler - Voyager 14" '84-89',Laser, Lebaron '85-'87
Dodge - Daytona, Aries, Charger, Lancer, Caravan '85-'89
Oldsmobile - Calais, Ciera, FWD '82-'87
- Firenza, Omega FWD '79-'86
Plymouth - Sundance '87-'89
Pontiac - 6000, Grand Am, J2000, Sunbird, etc. FWD '82-'87
- Fiero '82-'88
5 X 101.6 mm
'64-'69 Mopar "A" 13"
'65-'76 Mopar "A" 14"
Dodge - Aspen, Dart, Demon, Swinger (w/o discs) '63-'72
Plymouth - Barracuda, Duster, Valiant (w/o discs) '61-'74
5 X 108 mm
Volvo 140, 164 15"
Volvo - all to '89
Ford - T-Bird '89
5 X 110mm
Opel (Toutes celles en 5 trous après 1986, soit à partir de l'Omega A et Senator B)
5 X 112mm
Audi - 5000 Turbo, Quattro '86-'87
Mazda - RX7 GSL '86-'87
Mercedes - all '77-'89
VW - Transporter, Vanagon '71-'89
5 X 114.3 mm
AMC Gremlin, Hornet, Pacer, Javelin, Matator, AMX
AMC - most models (exc. Jeep) '40-'89
Chrysler/DeSoto - all full size RWD cars (exc. Imperial) '37-'89
Datsun/Nissan - 1600-2000 '65-'73
- 300ZX, 200SX V6 (some) to '89
Dodge van
Dodge 1/2 ton P.U.
Dodge - all full size cars & P.U.'s '37-'89
- Dart, Demon, Swinger '73-'80
Ford 1/2 ton van
Ford Granada, Monarch
Ford - All full size cars '49-'72; '79-'85
- Fairlane '62-'79
- T-Bird '55-'71; '77-'79
- Mustang 5-bolt '65-'73
- Maverick 5-bolt all
- Mustang SVO '85-'86
- Ranchero '68-'84
- Aerostar, Probe, Bronco II/Ranger to '89
Hudson - all '48-'56
Lincoln - all '70-'72; '80-'89
Mazda - RX7 Turbo, 626, 929, MX6 '86-'89
Mercury - all full size cars '52-'54; '61-'72; '79-'85
- Cougar '67-'79
Mopar '73-up "A" body
Plymouth - all full size cars '37-'89
- Barracuda '70-'74
- Duster, Valiant, Volare '73-'80
Pontiac - Tempest, LeMans '61-'63
Studebaker - all '51-'66
Toyota Crown, Hilux P.U.
Toyota - 2WD P.U. '69-'89
- Supra Turbo '86-'89
Volvo 122, 1800
5 X 115mm
Buick - Century, Electra, LeSabre, Regal, Riviera (some) '83-'89
Cadillac - Allante, most others '84-'89
Chevrolet - Celebrity '85-'89
Oldsmobile - Regency, Ciera, Cutlass, Delta 88 '84-'89
Pontiac - 6000 '83-'89
- Bonneville, Grand Am '86-'89
5 X 120mm
BMW 2500, 2800, 3.0, 520, 530, 630, 730
BMW - all 5 bolt to '89
Opel Toutes celles en 5 trous av 1986 (Commodore A, B & C - KAD - Monza - Senator A...)
5 X 120.6 mm
Buick - Regal, Century, Special (most mid-size) '64-'80's
Chevy van
Chevrolet - all (exc. as noted elsewhere) '49-'89
Corvette all
Corvair '65-'69 5-bolt
GM compact and midsize
Oldsmobile - 442, Cutlass, F-85, Toronado
(most mid-size) '60's-'80's
Pontiac - GTO, LeMans, Firebird, Grand Prix
(mid size) '64-'80's
5 X 127 mm
Austin-Healy 3000
Buick LeSabre, Centurion, Riviera, Electra
Buick - Electra, LeSabre, Riviera, (most full-size) '35-'87
Cadillac - DeVille, Fleetwood '38-'89
- SeVille '77-'79
Chevrolet 3/4 ton vans
Chevrolet - Bel Air, Biscayne, Impala, Caprice, Kingswood '71-'76
- above w/HD package wagons '77-'89
- Blazer 2WD '71-'83
Chrysler - Imperial '67-'71
Ford, LTD '73-'75
Ford - T-Bird '72-'76
- Galaxie, LTD, Custom '73-'78
Lincoln - all (exc Versailles) '60-'67; '73-'79
Mercury - all '55-'60
- Cougar, XR7 '73-'77
Oldsmobile - all full size RWD '40-'87
Packard - all '51-'55
Pontiac - all full size RWD '40-'86
Rover
5 X 130mm
Porsche - 911, 912, 944 to '89
5 X 139.7 mm
AMC - Jeep (5 bolt) '42-'89
Chrysler - 8 cyl. & wagon '46-'55
- Imperial '54-'66 Ford 2 ton van
Ford Bronco, F100
Ford - all '28-'48
- full size P.U., van, Bronco '49-'89
International Scout, Travelall
Lincoln - all '52-'60
Mercury - all '39-'51
Suzuki - Samurai '86-'89
4 trous
4 X 95.2 mm
Austin Marina
Triumph Spitfire, TR7
Lotus
4 X 98mm
Alfa Romeo Alfetta
FIAT
Lancia
4 X 100mm
Acura - Integra to '89
Audi - most models to '89
Audi Fox
BMW 1600, 2002
BMW - 2002, 300-series to '89
Chevy - Chevette '76-'87
- Spectrum, Nova '80-'89
Dodge - Omni, Rampage, Aries, 024 '79-'85
- Charger, Daytona (FWD) '82-'89
Honda - all (except '76-'80 Accord, Civic) to '89
Isuzu - Impulse, I-Mark to '89
Nissan - Pulsar, Sentra '87-'89
Opel (Toutes celles en 4 trous)
Plymouth - Horizon, TC3, Reliant, Voyager '78-'89
Renault - all to '89
Toyota - Celica, MR2, Tercel '86-'89
VW - Dasher, Fox, Jetta, Rabbit, Scirocco to '89
4 X 101.6 mm
Austin-Healey Sprite
Crosley - all '39-'52
MG Midget
Jensen Healey
GM L-body
Buick Skyhawk '75-'81
Chevrolet Vega, Monza '71-'81
Pontiac Sunbird, Astre '76-'81
Oldsmobile Starfire '75-'81
4 X 108 mm
Alfa Romeo (exc. Alfetta)
Ford - Fairmont '78-'86
- Mustang 4-bolt patterns '74-'93
- T-Bird '80-'88
- Pinto '71-'80
- Fiesta '78-'85
- Escort all (RWD and FWD)
- Cortina all
- Taurus, Tempo, EXP to '89
- German-built Capri I, II, III '69-'8?
Mercury - Capri '71-'88
- Cougar '79-'88
- Merkur, Topaz, Lynx '80-'89
- Zephyr '78-'86
Plymouth Cricket
Porsche - 924 '77-'84
Sunbeam - Tiger, Alpine '65-'70
4 X 110mm
Mazda - RX2, RX3, RX4, GLC, 626, P.U. '71-'82
- RX7 to '85
Honda
4 X 114.3 mm
Acura - Legend '86-'89
Buick - Special '61-'63
Chevrolet
Corvair all 4-bolt
Chevy II all 4-bolt
Sprint '85-'87
Nova ('61-'70)
Datsun/Nissan - most models to '89
Dodge Colt '79-'88
Dodge Colt (early) Ford
Mustang all '65-'68 4-bolt
Falcon, Maverick, Granada all 4-bolt
Honda Accord Prelude
Hyundai
Mazda - 626, RX7 '83-'87 ????
MGA, MGB, MGC
Mitsubishi Lancer, Galant, Mirage
Olds - F-85 '61-'63
Plymouth - Arrow, Sapporo '79-'88
SAAB all ???
SAAB - 900 to '87
Suzuki Ignis Swift
Toyota Corolla - most exc. MR2 and P.U. to '89
Triumph TR 1..6
Volvo V40 et S40
4 X 130mm
Porsche - 914 '71-'82
VW Beetle, 411, 412, 1500 Sedan, Transporter/Vanagon