Melrose Wheelchairs Melrose Wheelchairs
Wheelchair Tyre Diameter Chart
This chart is to assist you when matching other Tyre / Wheel combinations for your wheelchair. For example, you may wish to try out some Mountain Bike tyres for some offroad trails you want to hike. Matching the outside diameter of the tyre lets you maintain your wheelchair setup measurements - squeeze, dump, castor alignment, brake position etc. We may not stock all of these tyres, contact us for availability.

Tyre diameters were calculated using the ETRTO measurement as per ISO 5775.
TYRE DIAMETER = (RIM DIAMETER (25-540)) + (TYRE WIDTH (25-540) * 2)
For tyres less than 28mm width, 2.5mm has been added to achieve the height.
Some Imperial measurements may have conflicting numbers, these usually occur in the 25" tyres that sometimes say 26 x ...

SIZE

ETRTO

CALCULATED DIAMETER
inch        (mm)

IMPERIAL & DECIMAL

METRIC

22"

44-484

22.5        (572)

22 x 1 5/8 x 1 1/2

25-489

21.4        (544)

22 x 1.00

37-489

22.2        (563)

22 x 1 3/8

40-489

22.4        (569)

22 x 1 3/8 x 1 1/2

50-489

23.2        (589)

22 x 2.00

28-490

21.5        (546)

550 x 28A, 550A

32-490

21.8        (554)

22 x 1 3/8 x 1 1/4

550 x 32A, 550A

37-490

22.2        (564)

22 x 1 3/8

550 x 35A

37-498

22.5        (572)

22 x 1 3/8 x 1 1/4

32-501

22.2        (565)

22 x 1 1/4

37-501

22.6        (575)

22 x 1 3/8

 

24"

40-507

23.1        (587)

24 x 1.50

44-507

23.4        (595)

24 x 1.625 / 1.75

47-507

23.7        (601)

24 x 1.75 / 1.85 / 1.90

49-507

23.8        (605)

24 x 1.85

50-507

23.9        (607)

24 x 1.90 / 2.00 / 2.125

54-507

24.2        (615)

24 x 2.10

57-507

24.4        (621)

24 x 2.00 / 2.125

60-507

24.7        (627)

24 x 2.35

44-531

24.4        (619)

24 x 1 5/8 x 1 1/2

40-534

24.2        (614)

24 x 1 1/2

20-540

23.0        (585)

24 x 3/4

23-540

23.3        (591)

24 x 7/8

25-540

23.4        (595)

24 x 1.00

32-540

23.8        (604)

24 x 1 3/8 x 1 1/4, 24 x 1 3/8

37-540

24.2        (614)

24 x 1 3/8

40-540

24.4        (620)

24 x 1 3/8 x 1 1/2

22-541

23.2        (590)

25-541

23.5        (596)

600 x 25A

28-541

23.5        (597)

600 x 28A, 600A

32-541

23.8        (605)

24 x 1 3/8 x 1 1/4

600 x 32A

37-541

24.2        (615)

600 x 35A

 

25"

20-559

23.8        (604)

25 / 26 x 3/4

23-559

24.0        (610)

25 / 26 x 1.00

25-559

24.2        (614)

25 / 26 x 1.00

35-559

24.8        (629)

25 / 26 x 1.35

37-559

24.9        (633)

25 / 26 x 1 5/8 x 1 3/8, 25 / 26 x 1.40

40-559

25.2        (639)

25 / 26 x 1.50

44-559

25.5        (647)

25 / 26 x 1.625 / 1.50 / 1.75

47-559

25.7        (653)

25 / 26 x 1.75 / 1.85 / 1.90

50-559

25.9        (659)

25 / 26 x 1.90 / 1.95 / 2.00 / 2.10

54-559

26.3        (667)

25 / 26 x 1.95 / 2.10 / 2.125

57-559

26.5        (673)

25 / 26 x 2.125 / 2.20 / 2.25

60-559

26.7        (679)

25 / 26 x 2.35

62-559

26.9        (683)

25 / 26 x 2.50

20-571

24.3        (616)

26 x 3/4

650 x 20C

23-571

24.5        (622)

26 x 7/8

650 x 22C

40-571

25.6        (651)

26 x 1 1/2, 26 x 1 3/8 x 1 1/2

650 x 35C, 650 x 38C

47-571

26.2        (665)

26 x 1 3/4

650 x 45C

54-571

26.7        (679)

26 x 2 x 1 3/4

650 x 50C

 

26"

28-584

25.2        (640)

26 x 1 1/8 x 1 1/2

650 x 28B

32-584

25.5        (648)

650 x 32B

35-584

25.7        (654)

26 x 1 3/8 x 1 1/2

650 x 35B, 650B Standard

37-584

25.9        (658)

26 x 1 1/2 x 1 3/8, 26 x 1 1/2

650 x 35B

40-584

26.1        (664)

26 x 1 5/8 x 1 1/2, 26 x 1 1/2

650 x 35B, 650 x 38B

44-584

26.5        (672)

26 x 1 5/8 x 1 1/2

650 x 42B

54-584

27.2        (692)

26 x 1 1/2 x 2

20-590

25.0        (635)

650 x 20A

25-590

25.4        (645)

26 x 1 1/8 x 1 1/4, 26 x 1 3/8 x 1 1/8 - 1 1/4

650 x 25A

28-590

25.4        (646)

26 x 1 1/8

650 x 28A

32-590

25.7        (654)

26 x 1 1/4, 26 x 1 3/8 x 1 1/4

650 x 32A

35-590

26.0        (660)

26 x 1 3/8

650 x 35A

37-590

26.1        (664)

26 x 1 3/8

650 x 35A, 650A

40-590

26.4        (670)

26 x 1.50, 26 x 1 3/8 x 1 1/2

650 x 38A

44-590

26.7        (678)

32-597

26.0        (661)

26 x 1 1/4

 

27"

40-609

27.1        (689)

27 x 1 1/2

20-630

26.6        (675)

27 x 3/4

22-630

26.7        (679)

27 x 7/8

25-630

27.0        (685)

27 x 1.00, 27 x 1 1/16

28-630

27.0        (686)

27 x 1 1/8, 27 x 1 1/4

32-630

27.3        (694)

27 x 1 1/4

35-630

27.6        (700)

27 x 1 3/8

 

28"

18-622

26.1        (663)

28 x 3/4

700 x 18C

19-622

26.2        (665)

700 x 19C

20-622

26.3        (667)

28 x 3/4

700 x 20C

22-622

26.4        (671)

28 x 7/8

23-622

26.5        (673)

28 x 7/8

700 x 23C

25-622

26.7        (677)

28 x 1.00

700 x 25C

27-622

26.8        (681)

28 x 1 1/16

28-622

26.7        (678)

28 x 1.10, 28 x 1 5/8 x 1 1/8

700 x 28C

30-622

26.9        (682)

28 x 1.20

700 x 30C

32-622

27.0        (686)

28 x 1.25, 28 x 1 5/8 x 1 1/4

700 x 32C, 700C

35-622

27.2        (692)

28 x 1.35, 28 x 1 5/8 x 1 3/8

700 x 35C

37-622

27.4        (696)

28 x 1.40, 28 x 1 5/8 x 1 3/8

700 x 35C

40-622

27.6        (702)

28 x 1.50, 28 x 1 5/8 x 1 1/2

700 x 38C

42-622

27.8        (706)

28 x 1.60

700 x 40C

44-622

28.0        (710)

28 x 1.625

700 x 42C

47-622

28.2        (716)

28 x 1.75

700 x 45C

50-622

28.4        (722)

28 x 1.90 / 2.00

54-622

28.7        (730)

28 x 2.10, 29 x 2.10

57-622

29.0        (736)

28 x 2.10, 29 x 2.10

60-622

29.2        (742)

28 x 2.35

32-635

27.5        (699)

28 x 1 1/2 x 1 1/8

770 x 28B, 700 x 28B, 700B

40-635

28.2        (715)

28 x 1 1/2, 28 x 1 1/2 x 1 3/8

700 x 38B, 700 x 35B, 700 Standard, 700B Standard

44-635

28.5        (723)

28 x 1 5/8 x 1 1/2

700 x 40 / 42B

28-642

27.5        (698)

28 x 1 3/8 x 1 1/8

700 x 28A

37-642

28.2        (716)

28 x 1 3/8

700 x 35A


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