How many inches is a 700 × 42 C wheel

to be accurate,.. do a "roll out" check on a flat surface,
1)..Put the valve at the bottom & mark the floor near the valve.
2) roll the wheel one turn until the valve is at the bottom again and mark the floor again near the valve.
3) Measure the distance on the floor between the two marks.

..it should be approx 2100mm ( 83") ?
 
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