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Straight Sided Tyres
Straight sided tyres are similar in construction to wired on tyres and have inextensible wire beads. They were developed in the USA and employed either rims with a detachable flange or rims that could be reduced in diameter for tyre fitting and removal.

They were phased out for cars in the 1920s although they are still used on commercial vehicles.

 

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Straight sided wheels - dimensions.

 The top table refers to tyre size and the bottom gives details of the detachable rims.

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Tyre Size Information  - diameters and widths in inches

Tyre Size

Overall Diameter

Inflated
Width

Recommended
Rim Width

 Max. Load in lbs.

Revs. Per
Mile
31 x 4 31.50 4.20 2.75 900 673
32 x 4 32.45 4.20 2.75 1000 655
32 x 4.5 33.00 4.65 3.10 1250 643
43 x 4.5 34.80 4.70 3.10 1250 610
36 x 4.5 36.70 4.70 3.10 1250 578
33 x 5 33.50 5.20 3.75 1700 633
35 x 5 35.40 5.20 3.75 1700 599

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Detachable Rim and Tyre Sizes - dimensions in millimetres except for tyres

Tyre Sizes

 Outside Diameter Inside Diameter Overall width Inside Width
18 x 3.5
25 x 3.5		 492 451 87 59
19 x 3.5
27 x 4.40		 518 476 87 59
20 x 3.5
30 x 5.00		 543 501 87 59
21 x 3.5
29 x 4.40		 568 527 87 59
22 x 3.5
32 x 5.00		 594 552 87 59
23 x 3.5
31 x 4.00		 619 578 87 59
25 x 3.5
32 x 3.5		 670 626 87 59
18 x 4
27 x 4.75		 498 451 99 68
19 x 4
28 x 4.75		 522 476 99 68
20 x 4
29 x 4.50		 548 500 99 68
21 x 4
30 x 4.50		 573 527 99 68
22 x 4
32 x 4.00		 598 552 99 68
23 x 4
31 x 4 or 33 x 5		 624 578 99 68
24 x 4 or 33 x 4.5 649 601 99 68
25 x 4 or 34 x 4.5 675 626 99 68
18 x 4.5 or 28 x 5.00 502 450 111 79
19 x 4.5 or 29 x 5.00 527 476 111 79
20 x 4.5 or 30 x 5.00 552 501 111 79
21 x 4.5 or 31 x 5.00 578 525 111 79
22 x 4.5 or 32 x 5.00 603 551 111 79
23 x 4.5 or 32 x 4.5 or 33 x 5 629 577 111 79
24 x 4.5 or 33 x 4.5 654 601 111 79
25 x 4.5 or 34 x 4.5 or 35 x 5 679 626 111 79
18 x 5 or 30 x 6.00 502 449 127 95
19 x 5 or 31 x 6.00 527 476 127 95
20 x 5 or 32 x 6.50/6.20 552 500 127 95
21 x 5 or 33 x 6.00 578 525 127 95

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Specialised Automobile Services, Langley Mill, Langley Road, Langley
Macclesfield, Cheshire SK11 0DG
Tel: 01260 253119     Fax: 01260 252699     e-mail: sales@wirewheels.co.uk

 

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