Specialised
Automobile Services |
| 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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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 |
Recommended |
Max. Load in lbs. | Revs. Per |
| 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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Photographs: ©Robert Titherley