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).

What thread are chainring bolts?

75mm thread. As a rule, a set of chainring bolts designated for use with a single chainring will do the job nicely. Trouble arises when the chainring is thinner than it might be and the bolts tighten against themselves instead of clamping the ring to the spider.

Can you reuse chainring bolts?

Chainring bolts made of Steel or Titanium will typically last longer and can be re-used more times than aluminum bolts. If the bolts look good and function smoothly, there is usually no reason to replace them. When reusing bolts, clean them well so there is no grit or other debris that may hinder proper tightening.

Do chainring bolts need grease?

In other words all metal to metal threads should be greased or thread-locked…. this seems to be the rule. Yes, grease the chainring bolts. You could try a very very weak thread lock, but grease is enough.

Are chainring bolts a standard size?

Chainring bolts are a standard, one size spec for granny rings, no nuts, the single, double (or u can get longer bolts for single with bashgaurd or double with bash guard). So 4mm nuts and bolts to go with them is proper size.

How do you fit chainring bolts?

Securing the nut with chainring nut wrench or hex key, thread the bolt into the nut in a clockwise direction, screwing in just until the bolt feels resistance and the rings are held in place. Repeat for all bolts and then gradually move from bolt to bolt, tightening each bolt a quarter of a turn each time until tight.

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.

What is copper grease?

Copper grease is an anti seize compound designed to operate at extremes of temperature. Note, it is not a lubricant. Copper grease is effective within the temperature range of of – 40° to + 1,150° celsius making it an ideal choice for use on wheel nuts & bolts, flanges, studs and exhaust brackets to prevent seizing.

Should you grease bike bolts?

@ChristianLindig It’s the norm for manufacturers to not recommend greasing the taper, but greasing the bolts is a pretty universal practice.

Do all chainrings fit all cranks?

Largely speaking, yes. As long as your attempting to replace them with a chainring(s) designed to work with your chainset. Your cranks will have a specific bolt layout or fitment spec so you can’t just fit a BMX chainring to your triathlon bike.

Can I replace chainring without removing crank?

Changing rings is not that difficult, and in some cases, it’s possible to replace chainrings without removing the crank. That possibility is limited by what ring sizes you’re using, but hey, it’s always nice when you can work smarter not harder. This trick works for most road cranks and some mountain cranks.