How tight should chain ring bolts be?
A Shimano “General Operations” manual states the tightening torque for road chainwheels is 12-14 N-m. For mountain bike chainwheels it’s upped to 14-16 N-m for large and middle ring and 16-17 N-m for the smallest ring of a triple.
How are chain rings measured?
Bolt Circle Diameter (BCD) is the diameter of the circle that goes through the center of all of the bolts on your chainring. On bicycle chainrings, this dimension is usually measured in millimeters. On a chainring with 4 bolts, the BCD is the distance between two bolts across from each other.
Should you use Loctite on chainring bolts?
Chainring bolts don’t need much torque and they rarely come loose (i’m inclined to say never). Loctite will just make removal more difficult, and generous coat of grease will prevent corrosion just fine in practice.
What torque should your pedals be?
Typical torque for pedal thread is about 360 inch-pounds. With a foot long wrench, that is about 30 pounds of effort.
Should I grease chain ring bolts?
Yes, grease the chainring bolts. You could try a very very weak thread lock, but grease is enough.
What cranks should I get?
So in simple terms and assuming we all have similar proportions we could use our 172.5mm cranks and 1.778m height to suggest crank lengths should be 9.7% of our height….Crank Arm Lengths.
| Height | Crank Length(cm) |
|---|---|
| 6’0″ (1828mm) | 177.5mm |
| 5’11” (1803mm) | 175mm |
| 5’10” (1778mm) | 172.5mm |
| 5’9″(1753mm) | 170mm |
What are the dimensions of a 4 bolt chainring?
For 4-bolt chainrings: “A” = “B” x 1.414 For 5-bolt chainrings: “A” = “B” x 1.701 * Campy 110 BCD rings have a single offset bolt. They are not interchangeable with other 110 BCD rings and cranks.
How big is the outer nut of a chainring?
The outer nut has a standard external diameter of 10mm so theoretically the bolts can be used to fit any chainset. However, bolts are available in different lengths for different applications, e.g. for single or double chainrings (a double-chainring bolt being necessarily longer than a single-ring one).
What’s the difference between 4 and 5 chainring mounting standards?
What differs between 4 and 5 bolt chainring mounting standards is the diameter of a circle along which all the mounting bolts (centres) are placed. That is called BCD (Bolt Circle Diameter) – picture 1 explains it better:
How many bolt holes are in a bicycle chainring?
Most bicycle chainrings have between three and six bolt holes to attach them to the crank, spaced around a bolt circle. The tables at the bottom of this page give bolt-circle diameters for major brands. Aftermarket and less prominent brands tend to use the same bolt-circle patterns as the major brands.