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Tyre Size Guide

Tyre Size Guide

1. ISO Bike Tyre Size Standards
2. Complete Tables of all Bike Tyre sizes 

 

1. ISO Tyre Size Standards

bike tyrebike tyre sizes

ISO, the International Organization for Standardization has developed a universal tire sizing system that eliminates this confusion. 

(This system was formerly known as the "E.T.R.T.O." system, developed by the European Tyre and Rim Technical Organisation.)

The ISO system uses two numbers; the first is the width of the tyre or rim in mm. 

The second ISO number is the diameter of the bead seat of the rim, in mm. ("B.S.D."). 

All tyres should have an ISO number and at least one of two other sets of numbers. The second and/or third set of numbers may change depending on which country the tyre is being sold to.

In the above example the ISO number is 37-622, in Australia we call this size 700 x35, whilst in northern Europe they refer to this size as 28 x 1-5/8 x 1-3/8

2. Tables of Bicycle Tyre Sizes 

 

28" Old Postmans Bikes
ISO Traditional Size French Australian  
37-642 28 x 1-3/8 700 x 35A   Obsolete
28-642 28 x 1-3/8 x 1-1/8 700 x 28A    
44-635 28 x 1-5/8 x 1-1/2 700 x 40/42B   Old Roadsters
40-635 28 x 1-1/2 28 x 1-1/2 x 1-3/8 700 x 35B/38B    
32-635 28 x 1-1/2 x 1-1/8 700 x 28B, 770B Course    
29" MTB, 700c Road and Hybrid Bike Tyres
ISO Traditional Size French Australian  
60-622 28 x 2.35   29" x 2.35 Modern 29er MTB
50-622 28 x 2.0
28 x 1.9
  29" x 2.0
29" x 1.9
 
47-622 28 x 1.75 700 x 45C 700 x 45 Modern Hybrid Bikes
44-622 28 x 1.625 700 x 42C 700 x 42  
42-622 28 x 1.60 700 x 40C 700 x 40  
40-622 28 x 1.5
28 x 1-5/8 x 1-1/2
700 x 38C 700 x 38  
35-622 28 x 1-5/8 x 1-3/8 700 x 35C 700 x 35  
32-622 28 x 1-5/8 x 1-1/4 700 x 32C
700C Course
700 x 32  
28-622 28 x 1-5/8 x 1-1/8 700 x 30C 700 x 30  
30-622 28 x 1.20 700 x 28C 700 x 28 Modern City Bikes
25-622 28 x 1.00
28 x 1-1/16
700 x 25C 700 x 25 Modern Road Bikes
23-622 28 x 7/8 700 x 23C 700 x 23  
22-622 28 x 7/8 700 x 22C 700 x 22  
20-622 28 x 3/4 700 x 20C 700 x 20  
19-622 28 x 3/4 700 x 19C 700 x 19  
18-622 28 x 3/4 700 x 18C 700 x 18  
27" Bicycle Tyres
ISO Traditional Size French Australian  
35-630 27 x 1-3/8   27" Racers Old Racing Bikes
28/32-630 27 x 1-1/4     Some Old Ladies Bikes
32-630 27 x 1-1/4      
28-630 27 x 1-1/8
27 x 1-1/4 Fifty
27 x 1-1/4
     
25-630 27 x 1.00
27 x 1-1/16
     
22-630 27 x 7/8      
20-630 27 x 3/4      
40-609 27 x 1-1/2      

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