Bolt Circle Diameter (B.C.D.) On a crankset, the diameter of the circle formed by the stack bolts. Common 5-bolt double-chainwheel sets use 130 mm or 110 mm diameters. Modern triple chainwheel sets have two diameters, a large one for the two outer chainrings, and a smaller diameter, with a separate set of bolts, for the granny ring. How Calculate PCD (Pitch Circle Diameter) of a Flange? The PCD of a flange is one of the most critical dimensions. Now we will try to make easy to find the PCD (Pitch Circle Diameter) of a flange in our daily work. PCD (Pitch Circle Diameter) is the diameter of a circle that goes through each of the bolt holes.
Apr 12, 2015 · The diameter of the holes that are equally distributed around the bolt circle diameter Bolt circle diameter: the diameter of the circle on which the holes will be evenly distributed. Start angle: The 0° angle is to the right in the "X" axis and aligned with the center of the bolt circle in the "Y" axis. DN = diameter nominal (size) A = flange b = thickness of flange D2 = diameter of raised face D1 = diameter of bolt circle n = number of bolts d = diameter of bolt holes FIRSTINFO Bolt Circle Wheel Lug Pattern Gauge with Slide Rule PCD Ruler 18.104.22.168 Lug Bolt Patterns Measurement Tool. 4.3 out of 5 stars 5. $18.00 $ 18. 00. Bolt patterns can be 4-, 5-, 6-, or 8-lug holes. A bolt circle of 4x100 would indicate a 4-lug pattern on a circle with a diameter of 100mm. Given here is an online bolt circle calculator to calculate bolt pattern for the angle of holes and its respective X and Y co-ordinates.
Oct 21, 2019 · The term “bolt pattern” refers to the number of bolt holes and the diameter of the circle that they form on your wheels. When you need to update or replace the wheels on your vehicle or trailer, having an accurate bolt pattern measurement is key to finding wheels that fit correctly. Dec 30, 2018 · Bolt Circle Diameter. The first concept one must be familiar with to understand bolt patterns is called BCD, for Bolt Circle Diameter. If you lay one of your wheels on the ground and draw a circle that passes through the center of each of the lug holes, that is the Bolt Circle, and it only remains to measure the diameter of said circle.
Information disclaimer: The information contained in this article is for general information purposes only. The information is provided by United States Plastic Corp. and while we endeavor to keep the information up to date and correct, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with ... Nov 29, 2018 · Bolt Pattern Basics Every vehicle rolls off the assembly line with wheels designed to its exact specs, which means there’s no such thing as a one-size-fits-all rim. So, if you’re in the market for some new ones, you’ll first need to know a few measurements — the desired diameter of your new wheels, the desired width …