I am trying to calibrate my bike computer and i need to enter in the correct wheel factor.?
Question by G-M-B-A: I am trying to calibrate my bike computer and i need to enter in the correct wheel factor.?
So I’m looking at the tire and it says 26 X 1.95 but i’m still not sure which is right wheel factor.
Closest options on the computer are:
26″ (650A) or
ATB 26″ X 1.75 or
ATB 26 X 2 (650B)
I have no idea what “ATB” or the “A” or “B” stands for, i was hoping someone who knows bikes could discipher?
Also, the wheel diameter 26.6″ (700 X 25C) is highlighted in bold in the manual for computer, as if that is a common wheel size or something..
Thanks for any help!
Best answer:
Answer by Roger J
Every computer may difer. Refer to the onwers manual. If you lost it, look-up the manufactuer on the web. It’s a very interesting science. I’ve done it several times. Take the time to read.
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Just measure the circumference of the wheel yourself, it will be more accurate then the figures they give you. Put the valve on your wheel down at bottom, mark on the floor, then rotate your wheel until valve is at bottom again, mark and measure the distance traveled.
You will need to do a procedure called a ( Wheel Roll Out Method) and use the valve stem to make your marks on the floor. Inflate tires to riding pressure. Position your bike ( I like to use my kitchen Floor for this procedure) so the valve stem of the front wheel is at the bottom position and mark the floor (pencil works great)
Roll the bike forward in a straight line while applying pressure to the handle bars to simulate rider weight.
When you move the wheel one complete revolution again mark the floor according to the valve stem.
Measure the distance on the floor, converting your inches to millimeters 1 inch = 25.4mm so your distance in inches x 25.4 millimeters will give you your correct wheel setting for your computer.