The bolt pattern (also known as the P.C.D. or Pitch Circle Diameter) of a vehicle can be referenced in either standard or metric, and usually the year and kind of vehicle dictates how the bolt pattern is referenced. Most older cars the bolt pattern is referenced in standard "Five on Four and a Half" (or 5x4.5), versus a model car that is referenced in metric "Five on One Fourteen Point Three" (or 5x114.3). Both are correct, but it can sometimes be confusing as we have heard folks say "No, my car isn't 5x114.3 it's 5x4.5!!". Here's a handy reference for those times:

BOLT PATTERN CONVERSION (mm to inches)

COMMON REFERENCE	MILLIMETERS	CONVERTS TO	INCHES
Three on One Twelve	3x112	CONVERTS TO	3x4.41
COMMON REFERENCE	MILLIMETERS	CONVERTS TO	INCHES
Four on Ninety Eight	4x98	CONVERTS TO	4x3.9
Four on One Hundred	4x100	CONVERTS TO	4x3.94
Four on Four	4x101.6	CONVERTS TO	4x4
Four on One "O" Eight --- or --- Four on Four and a Quarter	4x108	CONVERTS TO	4x4.25 or 4x4 1/4
Four on One Ten	4x110	CONVERTS TO	4x4.33
Four on One Fourteen Point Three --- or --- Four on Four and a Half	4x114.3	CONVERTS TO	4x4.5 or 4x4 1/2
COMMON REFERENCE	MILLIMETERS	CONVERTS TO	INCHES
Five on One Hundred	5x100	CONVERTS TO	5x3.94
Five on Four	5x101.6	CONVERTS TO	5x4
Five on One "O" Eight --- or --- Five on Four and a Quarter	5x108	CONVERTS TO	5x4.25 or 5x4 1/4
Five on One Ten	5x110	CONVERTS TO	5x4.33
Five on One Twelve	5x112	CONVERTS TO	5x4.41
Five on One Fourteen Point Three --- or --- Five on Four and a Half	5x114.3	CONVERTS TO	5x4.5 or 5x4 1/2
Five on One Fifteen	5x115	CONVERTS TO	5x4.52
Five on One Twenty	5x120	CONVERTS TO	5x4.72
Five on Four and Three Quarter	5x120.7	CONVERTS TO	5x4.75 or 5x4 3/4
Five on Five --- or --- Five on One Twenty Seven	5x127	CONVERTS TO	5x5
Five on One Thirty	5x130	CONVERTS TO	5x5.12
Five on One Thirty Five	5x135	CONVERTS TO	5x5.3
Five on Five and a Half --- or --- Five on One Thirty Nine	5x139.7	CONVERTS TO	5x5.5 or 5x5 1/2
Five on One Fifty	5x150	CONVERTS TO	5x5.9
COMMON REFERENCE	MILLIMETERS	CONVERTS TO	INCHES
Six on One Fourteen --- or --- Six on Four and a Half	6x114.3	CONVERTS TO	6x4.5 or 6x4 1/2
Six on One Twenty Seven --- or --- Six on Five	6x127	CONVERTS TO	6x5
Six on One Thirty	6x130	CONVERTS TO	6x5.1
Six on One Thirty Two	6x132	CONVERTS TO	6x5.2
Six on One Thirty Five	6x135	CONVERTS TO	6x5.3
Six on Five and a Half --- or --- Six on One Thirty Nine	6x139.7	CONVERTS TO	6x5.5 6x5 1/2
COMMON REFERENCE	MILLIMETERS	CONVERTS TO	INCHES
Seven on One Fifty	7x150	CONVERTS TO	7x5.9
COMMON REFERENCE	MILLIMETERS	CONVERTS TO	INCHES
Eight on Six and a Half	8x165.1	CONVERTS TO	8x6.5 or 8x6 1/2