Technical Info - Tyre Size Conversion Chart

Wheel Hub & Spoke Sizes Beaded Edge Wheels & Tyres Well-based Wheels & Wired-on Tyres Straight Sided Tyres Tyre Size Conversion Chart Bibendum Wheels and Tyres Worn Hub Diameters Calculating 4 & 5 Stud PCD

Rim Dia.	Tyre Section - All dimensions in inches
	3.50	4.00	4.50	4.75	5.00	5.25	5.50	6.00	6.50	7.00	7.50
18				27 x 4.75		28 x 5.25	28 x 5.50	30 x 6.00	30 x 6.50 30 x 6.20	32 x 7.00 30 x 6.75
19	26 x 3.50	27 x 4.00	28 x 4.75 27 x 4.40	28 x 4.75	28 x 4.95 29 x 5.20	29 x 5.25	29 x 5.50	31 x 6.00	31 x 6.50 31 x 6.20
20			29 x 4.50	29 x 4.75	30 x 5.00 29 x 4.95	30 x 5.25	30 x 5.50	32 x 6.00 30 x 5.77	32 x 6.50 32 x 6.20	34 x 7.00 32 x 6.75	34 x 7.30
21			30 x 4.50 29 x 4.40	30 x 4.75	31 x 5.00 30 x 4.95	31 x 5.25		33 x 6.00		35 x 7.00 33 x 6.75
22					32 x 5.00 31 x 4.95	32 x 5.25		34 x 6.00 32 x 5.77
23			31 x 4.40		33 x 5.00 32 x 4.95			35 x 6.00 33 x 5.77	35 x 6.60	37 x 7.00	37 x 7.50
24					34 x 5.00 33 x 4.95			36 x 6.00 34 x 5.77
25								37 x 6.00 35 x 5.77