What does 130mm BCD mean?

The diameter of that circle is the BCD. When you see a measurement like 110 or 130 BCD, that means that diameter is 110 or 130 millimeters, respectively.

What is the most common BCD?

144 is probably the most common these days, although Campy and Sugino also used to use 151.

What is 110 BCD chainring?

Bolt Circle Diameter (BCD) is the diameter of an imaginary circle running through the center of the chainring mounting holes. It is always defined in millimeters.

How do I know my BCD size?

In many cases the BCD is printed right on the chainring like in the example below. Sometimes it is stamped or engraved on the back side of the chainring. If it is not labeled on your chainring, you will need to measure it. On a chainring with 4 bolts, the BCD is the distance between two bolts across from each other.

How do I know what chainring to buy?

One of the easiest ways to determine which chainring is going to be compatible with your crank is to simply type in your brand, type, groupset, and type, added with “chainring”, and possible the amount of teeth you want. You can find the type of the crank located at the back of it.

What size BCD do I need?

BCD Size Chart
Size Weight (kg) Waist (cm)
M 64-79 83-101
L 77-95 91-112
XL 93-109 101-122

How do I choose chainrings?

The larger chainring gives you bigger, harder to turn gears that move you further per pedal revolution – so it’s suitable for higher speeds – while the smaller chainring gives you gears that are easier to turn but move you a shorter distance per pedal revolution – so it’s suitable for lower speeds, including riding …

Are all chainrings the same size?

Rings are supplied with different sizes with different amounts of teeth. The more teeth, the bigger the chainring. The number of teeth affects how much effort is needed to turn the pedals. The larger the chainring the more rotations of the rear wheel you’ll achieve by a single rotation on the front chainring.

What size chainrings do I need?

Basically, large chainrings are for going fast and/or riding on the flat or on downhills. Smaller chainrings are for going up hills. Smaller rings go closest to the frame while larger rings go furthest from the frame.

Should I get a 52T or a 130mm BCD?

You can get 53t rings for 110mm BCD but they are not common. So if you feel that you’d be at a disadvantage with only a 52t ring, get the 130mm. I live on a steep road, like races with big climbs and do a lot of climbing in general, so it’s compact for me.

What does BCD mean on a motorcycle?

What is BCD? BCD is an acronym for Bolt Circle Diameter . It’s the measurement (diameter) of an imaginary circle passing through the centers of all the bolts in a round pattern – like chainring bolts that hold the rings to the crank.

What does 104/64 BCD mean on a chainring?

On triple cranks, and on most mountain 2×10 (and 2×11) set-ups, there are 2 Bolt Circle Diameters — one for the large ring (or rings), and one for the small chainring. In this case, they are usually designated as something like 104/64 BCD. That means 104 mm bolt circle diameter for the larger ring, and a 64 mm diameter for the smaller ring.

What is the specification for BCD?

The specification for BCD is pretty easy when there is only one Bolt Circle on your crank. Most road and cyclocross doubles have just one BCD where both the large and small ring mount. However, that is not always the case.