I am a lonely visitor
Join Date: Feb 2002
Location: Where even Richard Nixon has got soul
Bikes: Michelle Pfieffer, the Carbon Fiber Wonder Bike: A Kestrel 200 SCI Repainted in glorious mango; Old Paintless, A Litespeed Obed; The Bike With No Name: A Bianchi Eros; RegularBike: A Parkpre Comp Ltd rebuilt as a singlespeed.
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OK Private, I looked into this a little. If I have this right, the distance between your two marks in millimeters is the number you should enter for miles per hour.
24 x 2.10 is an odd sized tire. I'm curious what kind of bike you have.
Also, is there an ERTRO size on your tire? If so, it is probably on the label where you found the tire 24 x 2.10 tire size. It will be expressed as a two digit number followed by a dash and a three digit number.
If there is an ERTRO number, you might find the same number in the manual that came with your bike computer. Use it to calibrate your computer. ERTRO numbers are generally more accurate anyway.
Religion is a good thing for good people and a bad thing for bad people. --H. Richard Niebuhr