I bought a bike computer for my Dahon Mariner D7 today and I don't have a tape measure. Does anyone know the circumference for the Kenda 20" x 1.5" tires it comes with? The instruction booklet only has the codes for 26" and 700cc tires. Thanks!
An approximation on diameter is to take the bead diameter + 2 times the tire width.
Originally Posted by Uberneot
Multiplying the diameter times pi will give you circumference.
1.5" is about 38mm.
Not sure if that tire is a 406 or 451, but a majority of 20X 1.5 tires have an ISO 406mm bead diameter.
Diameter = 406mm + 2x38mm =484mm.
Circumference= 484mm* 3.14=1520mm
Its too easy just to measure, put the valve stem down on a sidewalk crack roll the bike forward until the valve stem is down again, mark it and get out your tape measure.
good god man....do you have the cure for cancer formula too?