Originally Posted by Richard80

I can use some help with finding the right tire circumference to set in my Wahoo app.
My tire is a "Bontrager R1 700 x 25 / hard-case lite".
When I choose a "700 x 25c" in my Wahoo app, it sets a circumference of 2.105 millimeter.
However, when I measure the tire circumference manually, it is about 2.130 millimeter and according to the Wahoo app I have to choose "700c Tubular".
My question is: What is the difference between "700 x 25c" and "700c Tubular"? And what is the right size in millimeters to use?