2006-12-19 22:11:40 · 7 answers · asked by Red Robin 3 in Sports ➔ Cycling
If you mean a bicycle with a 26" WHEEL, it depends on the size of tire you use. If it's a mountain bike, with a tire size of 26" x 2.0" on average, you can do a rollout to measure the exact circumference of the inflated tire.
Also, a 26" wheel with a 2" tire is about 28" around, and the circumference is about 2100mm, or a little over two meters.
So with a little math, it turns out that the wheel would rotate about 475 times per kilometer.
2006-12-20 01:09:52 · answer #1 · answered by Anonymous · 2⤊ 1⤋
Do you mean the number of revolutions of the wheel per kilometer?
If so,
1) take the outside diameter of the tire (not the wheel since the diameter of the tire is larger than that of the wheel), multiply by 3.142. This will give you the circumference in inches;
2) Multiply this number by 25.4. This will give you circumference in millimeters;
3) Determine the number of millimeters in a kilometer, then divide this by the circumference. There is your answer to within 1mm.
2006-12-20 09:43:57 · answer #2 · answered by bikeworks 7 · 1⤊ 0⤋
26''=0.66m
D=0.66m
Circle circumference= pi X D
C=2.07m
1000m=1km
Nr revolutions=1000/2.07
Nrrev=483
2006-12-20 06:17:32 · answer #3 · answered by Λиδѓεy™ 6 · 0⤊ 0⤋
If you want to determine what the REAL circumference of the wheel will be you really need to measure the distance from the ground to the center of the hub when the wheel is actually loaded.
2006-12-20 21:26:17 · answer #4 · answered by Nick F 6 · 0⤊ 0⤋
since an inch is aproximately 2.54 cm
and the distance travelled during one revolution is
PI* 2 * R = 3.14 * 2 * 13" = 3.14 * 2 * 13 * 2.54 = 207.3656 cm
and since 1 km = 1000 m = 100.000 cm that means
the nr. of revolution is 100.000 / 207.3656 = 482.24006296126262022244769624277 revs
hope i didn't make any calculation mistakes... :D
2006-12-20 06:31:31 · answer #5 · answered by ╠╬╣ 3 · 0⤊ 0⤋
482 but if you want to add the extra little movement, it's 482.0936639. Hmm, thanks a lot for reminding me of school during holiday, haha, well, at least I got to use my brain a bit.
2006-12-20 12:36:12 · answer #6 · answered by longtailedmonkey 2 · 0⤊ 0⤋
A kilometER (not re) is part of the Metric system, and I live in the U.S.
2006-12-20 06:15:24 · answer #7 · answered by AngryAmerican82 3 · 0⤊ 2⤋