Each chainring bolt – the number will vary depending on the chainset design, but is usually four or five – consists of two parts, a female-threaded ‘outer’ part and a matching male ‘inner’. The outer nut has a standard external diameter of 10mm so theoretically the bolts can be used to fit any chainset.
Are all chainring bolts the same size?
Chainring Bolts come in many different lengths and are often referred to as single, double or triple which a rough guide only. … Single bolts are generally between 3.5 – 5.0mm Long. Double bolts are generally between 5.0 – 6.5mm long. Triple bolts are generally 7.0mm or longer.
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.
Are all chainrings compatible?
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.
What size are Shimano chainring bolts?
Outer diameter of male bolt across threads is 7.7mm, outer diameter of female sleeve/nut is 9.6mm. Diameter of both across the pan head is 11.6mm. These are the measurements for a Shimano 5700 compact crank 50/34 stock chainrings, for future reference.
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®|
Which way do chainring bolts go?
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.
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 are chainring bolts?
Chainring bolts perform the simple task of securing one or more chainrings to the chainset spider, and in the case of many MTBs, a bash guard as well. … The outer nut has a standard external diameter of 10mm so theoretically the bolts can be used to fit any chainset.
How do you know if a chainring is compatible?
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.
Will any chainring fit any crank?
Any chainring that has the same bolt circle diameter (BCD) and the same number of bolts as your crank is compatible with your crank.
Are all Shimano chainrings compatible?
Shimano users who wish to upgrade chainrings should note if their bike uses a compact, mid-compact or standard crankset. … In order for chainrings to be compatible with Shimano cranksets, they must have the same 110mm or 130mm BCD measurements as Shimano cranksets.
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.
Are bike crank 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.