Q: What is the relationship between circumference and diameter?
A: Circumference divided by pi(3.14) equals diameter. A wheel with a circumference of 112 cm will have a diameter of 35.6 cm. The math is: 112 cm divided by 3.14 = 35.6 cm.

Q: What wheel sizes will bike computers accept?
A: Cateye computers will generally accept wheel circumferences from 112 cm to 255 cm. Put another way, that represents wheels from 14 inches (35 cm) to 32 inches (81 cm) in diameter. Sigma Sport and Topeak computers will accept a wheel size from 1 to 50 inches ( 2.5 cm to 127 cm) in diameter. Topeak and the Sigma Sport BC600, 800, 1200, 1400 and Targa all use the more precise 4 digit, wheel setting numbers.

Q: What is the best way to measure wheel circumference?
A: The most precise method is to use a 6 foot (2 meters) piece of single strand, 16 to 20 gauge wire. Bend a small "L" on one end and then tape that end to the center of your tire's tread. Be sure to bring your tires up to the normal pressure that you ride with first. Then, lay the wire lengthwise along the outside of your tire's tread and use electrical tape to hold it in place. When you come back around to your starting point, bend another "L" in the wire. Now carefully remove the wire and precisely measure it. This measurement will be the exact circumference of your wheel.
Different width, brands and types of tires will have different circumferences. If you race on one set of wheels and train on another we reccommend precisely measuring both sets. If the circumference difference is more than 5% we suggest using a computer that allows for two wheel settings. Your speed and distance readings will be more precise and make more sense.

The calibration chart below gives approximate values for the circumference of various size tires. For an exact measurement and precise readings we suggest using the method detailed above.

At Branford Bike we want you to be happy and satisfied with everything you purchase from us. We understand that sometimes you will need to return a product because it was not quite what you wanted. You may return anything you purchase from us within 60 days and unused, for an immediate exchange or refund.

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Our Secure Order Form opens in a separate window that you may resize and tile behind our online catalog. After filling in your name, address and card information you may leave the order window open. Browse through our catalog and when you wish to purchase an item simply "cut and paste" the part number and description to the appropriate order form boxes.

When you are done shopping, submit your order for error checking, and then for processing. We will email you a confirmation within 10 minutes. Another, more detailed confirmation, will follow when we ship your order.

   
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