Tyre sizes in ISO, Imperial,Metric & American

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ISO Imperial Metric American Tyre Diameter Circumference
sect–dia       (mm) (in) (m)
40–635 28×1½ 700B   715 28.1 2.25
25–630 27×1   27×11/8 680 26.8 2.14
32–630 27×1¼   27×13/8 694 27.3 2.18
18–622   700×18C 700×20C 658 25.9 2.07
23–622   700×23C 700×25C 668 26.3 2.10
25–622   700×25C 700×28C 672 26.5 2.11
28–622 28×15/8×11/8 700×28C 700×32C 678 26.7 2.13
32–622 28×15/8×1¼ 700×32C 700×35C 686 27.0 2.16
37–622 28×15/8×13/8 700×35C   696 27.4 2.19
47–622   700×47C   716 28.2 2.25
32–597 26×1¼     661 26.0 2.08
28–590   650×28A   646 25.4 2.03
37–590 26×13/8 650A   664 26.1 2.09
28–584   650×28B   640 25.2 2.01
40–584 26×1½ 650B   664 26.1 2.09
20–571     26×¾ 611 24.0 1.92
23–571     26×1 617 24.3 1.94
40–571   650C   651 25.6 2.05
25–559     26×1.0 609 24.0 1.91
32–559     26×1.25 623 24.5 1.96
40–559     26×1.5 639 25.2 2.01
47–559     26×1.75 653 25.7 2.05
50–559     26×1.9 659 25.9 2.07
57–559     26×2.125 673 26.5 2.11
28–541   600×28A   597 23.5 1.88
37–541   600×35A   615 24.2 1.93
32–540 24×13/8     604 23.8 1.90
28–520     24×11/8 576 22.6 1.81
37–507     24×1.5 581 22.9 1.83
47–507     24×1.75 601 23.7 1.89
37–501 22×13/8     575 22.6 1.81
37–489   22×13/8   563 22.2 1.77
28–451 20×11/8     507 20.0 1.59
35–451 20×13/8     521 20.5 1.64
28–440   500×28A   496 19.5 1.56
32–440   500A   504 19.8 1.58
28–406     20×11/8 462 18.2 1.45
37–406     20×1.5 480 18.9 1.51
47–406     20×1.75 500 19.7 1.57
54–406     20×2.0 514 20.2 1.61
32–369 17×1¼     433 17.0 1.36
28–355     18×11/8 411 16.2 1.29
40–355     18×1.5 435 17.1 1.37
47–355     18×1.75 449 17.7 1.41
37–349 16×13/8     423 16.7 1.33
32–340   400A   404 15.9 1.27
37–340   400×35A   414 16.3 1.30
47–305     16×1.75×2 399 15.7 1.25
47–203     12×1.75 297 11.7 0.93
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