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Wheel / Tyre Sizing Notes
Where possible, we express wheel sizes in the ISO, French (FRE) and American (IMP) standards. For tyre sizing information, and an overview of the different size standards view the Schwalbe Technical Information (939KB) FAQ. The best and most reliable way to ensure you have the correct size is to check for the ISO code (in the form xx - yyy where xx is the tyre width in mm and yyy is the wheel diameter in mm) of your existing tyre. Most modern tyres will work, whatever the width, when the correct wheel diameter size is selected though frame clearance can become an issue with drastically wider tyres than were originally intended, particularly for road style bicycles. Consult the literature that came with your frame for information on frame clearances and other tolerances.