Road Bike Wheel Circumference For Computer

I m on a road bike. It s a fire road. Because of its large circumference this wheel has excellent rolling performance and traverses most objects with ease.

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Bicycle Sizing Chart By Wheel Size Sigma Bike Computer Wheel Size

Your Bike Computer Needs The Right Wheel Circumference To Be

Chassis Material High Carbon Steel Wheel Diameter Size 24 Inches

Trying to find proper circumference for 700c wheel with 25 mm tires i am.

Road bike wheel circumference for computer. Have a friend mark that spot with tape of chalk. Bikecalc takes this view. For more info on wheel circumference. I recently switched to 700 x 25 tires for my bike and my wife s.

Sit on your bike next to a wall. The easiest way of how to determine the wheel size for a bike computer is to roll the bike on the ground. We recommend checking out sheldon brown s calibration page. First pump up the tires.

Mark that spot with tape of chalk. The rear wheel creeps on the road surface as you pedal and can skid during braking so it gives a less accurate readout. Since the tire wraps around your rim the wheel diameter includes the tire on both sides thus the multiplication by 2. At your normal operating pressure measure the height of the tire from the top of the rim to where the tire ends.

Second place a tape measure on the ground. Her basic bike computer manual said to use 2124. I won t argue that it s correct just that it s simple and as likely to be right as any other strategy. Roll forward one revolution of the wheel so the valve stem is at the bottom of the wheel again.

You know the radius of a 700c wheel. Etrto tire size l mm l cm inch 47 203 12x1 75 935 94 54 203 12x1 95 940 94 12 40 254 14x1 50 1020 102 14 47 254 14x1 75 1055 106 40 305 16x1 50 1185 119. Since the effective tire size is affected by tread thickness tire pressure and rider weight the rolling circumference should be measured by rolling the bike with the rider aboard. Please note this table is only a guideline and by no means complete or 100 accurate as wheel circumference can vary due to tire pressure tread selection tire thickness rider weight rim width and load.

Measure the distance between the two marks in mm. Add that to the rim s radius and then 2 pi r. With a 622 mm bead seat diameter the 700c wheel is the most common tire size found on nearly every production road bike. Roll forward till your valve stem is at the bottom of the wheel.

Accuracy counts so measure your bicycle wheel circumference correctly when installing and setting your cycling computer. Wheel circumference wheel diameter pi. They have enough in common to blast down it.