Bicycle tyres aren't measured by the diameter, you need to check the size that is written on the side wall of the old tyres before ordering. 
Please feel free to message us with a photo of the old tyres if you are unsure of the size you need. 
TIRE 700X40C C-1446 CST 42-622

Brand CST (we have been selling CST for over 20 years!

High quality replacement tyres 

• Wired tyre
• Colour: black
• MAX PSI 75

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