How to choose the right size?

We always recommend replacing your bicycle’s tyres with the same size as the original equipment. Tyre width and wheel diameter are specified in millimeters by ETRTO but measurement in inches may also be used as an alternative.

ETRTO vs Alternative size differences

To recognize the correct size in ETRTO vs Alternative system we have prepared a short overview of what the differences are between those systems. ETRTO is the inner diameter in mm whereas alternative is the outer diameter in inches. Widths are stated in mm for ETRTO or inches for alternative sizes.

Marking example:

ETRTO: 57-622
Alternative: 2.25x29"

Conversion table

The conversion table helps you transfer between ETRTO and the alternative system