Originally Posted by
carleton
FYI: Your Io requires a 19c tire, Comete 22-23c. Many people use different tires on the Io and Comete. Different make/model of tires, not just different size.
What makes you say the IO needs a 19?
According to
IO | Mavic - United Kingdom the specification is 18 to 22 mm and looking at Manchester (my "home") Velo's info
Track bike specification - National Cycling Centre they recommend 22 (regardless to wheel choice).