Do Shimano chainrings come with bolts?
The thing is that the bolts needed for the BB were a larger diameter than the ones with crank, so those are the ones I used. But every time I have bought a Shimano BB, they come with bolts, and every high end Shimano crankset also tends to come with bolts.
What size are chainring bolts?
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).
Are chainring bolts universal?
The female-threaded “outer” part has a standard external diameter of 10mm, so any crank bolt will fit into any chainset. That does not, however, mean that any set of crank bolts will work for every chainset. As a rule, a set of chainring bolts designated for use with a single chainring will do the job nicely.
Do I need new chainring bolts?
Chainring bolts made of Steel or Titanium will typically last longer and can be re-used more times than aluminum bolts. They also handle torque better. Aluminum bolts are lighter and come in more colors. If the bolts look good and function smoothly, there is usually no reason to replace them.
What thread is a chainring bolt?
Bicycle Industry Threads
| Nominal Thread Size | Example of Bicycle Uses |
|---|---|
| 8mm x 1.25mm | Stem hardware, stud type crank nuts, suspension hardware |
| 8mm x 0.75mm | Chainring bolt |
| 9mm x 1mm | Front hubs, quick-release, Asian manufacturer |
| 9mm x 26 tpi | Front hubs, Campagnolo® |
When should I replace chainring bolts?
Replace the Chainring Bolts: – If there is any damage on the threads or on the wrench locations. – If excessive torque was required to loosen the bolts. – If any corrosion or rust or other malady is visible. – If the nut and bolt feel gritty when you are tightening them together.
How tight should chainring 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.