Chain Ring Bolts
5 min read
Asked by: Rebecca Walker
Are chain ring bolts universal?
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.
What size are chain ring bolts?
One aspect that is often overlooked is that many chainrings have recessed bolt holes, the depth of the recess should also be taken into consideration. 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.
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 chain ring bolts?
Quote from video: Put one of the chain ring bolts in doing it up by hand. Then do the same with the opposing bolt. And then the remainder.
Should you grease chain ring bolts?
Yes, grease the chainring bolts. You could try a very very weak thread lock, but grease is enough.
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.
What does BCD mean chainring?
Bolt Circle Diameter
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.
How do I measure my BCD?
Look at the photos and compare to your crank or chainrings. Find the number of bolts in the circle (Left Column) and the approximate measurement (metric or English) between adjacent holes. Find those numbers in the table, then in the Right Column you’ll see the Bolt Circle Diameter (BCD).
What is a crank bolt?
Crank bolts, as the name suggests, are used to secure the crank to the axle (spindle) of the bottom bracket(BB). While they are another of those parts that may go largely unnoticed by most riders – sometimes they are even covered by a dust cap – they may become loose and worn over time and require replacement.
Is PCD the same as BCD?
Chainrings are sold by number of bolts and PCD or BCD, which is the same thing and stands for Pitch Circle Diameter or Bolt Circle Diameter. Easier than diameter to measure is the centre-to-centre distance between two adjacent bolts.
How do I know what size chainring to get?
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
Can I change chainring size?
As a general rule, you can change the size of your chainring 2 teeth without changing your chain length. If you go more than 2 teeth smaller, you will need to shorten your chain. With smaller chainrings, you may find yourself spinning out on fast downhills.
Do you need 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.
Do you lube chainring?
A good chain lube can smooth the chain’s engagement with the cassette sprockets and chainrings, and maintain proper shifting performance. It also helps prevent corrosion and reduces friction and drivetrain wear.
How often should you clean crankset?
How to Tighten Chainring Bolts on Bike | Using a Chainring …
Do you grease crank bolts?
With or without lubricant, in use, cranks will make metal-to-metal contact with the spindle, causing fretting erosion of the steel spindle for all but the lightest riders. Lubricating the spindle for assembly assures a predictable press fit for a given torque.
What is a crank bolt?
Crank bolts, as the name suggests, are used to secure the crank to the axle (spindle) of the bottom bracket(BB). While they are another of those parts that may go largely unnoticed by most riders – sometimes they are even covered by a dust cap – they may become loose and worn over time and require replacement.
How do you measure a BCD crank?
Quote from video: If you measure right in the center of this hole here to the center of the other the opposite hole there that will give you the diameter of that circle. Or the BCD.
What makes up a crankset?
The crankset comprises the two crank arms to which the pedals are attached and between one and three chainrings that the chain runs over. Cranksets are typically comprised of the chainring(s)… In modern designs, it also typically includes the bit in the middle – the axle or spindle – that connects the two sides.
Should I grease crank spindle?
With or without lubricant, in use, cranks will make metal-to-metal contact with the spindle, causing fretting erosion of the steel spindle for all but the lightest riders. Lubricating the spindle for assembly assures a predictable press fit for a given torque.
How often should you clean crankset?
Around the three month mark is normally enough time, even in the best conditions for dirt to work its way into the small gaps and contact points around the crankset and bottom bracket area.