About RK chain

What does RK stand for?

A. RK is an abbreviation of Rolle Kette. Which is German for Roller Chain. The japanese company utilized German technicians.

*Actually, the company was originally called Race King when it first came to America, but American management said the name had to go. It was shortened to RK. How do I know?Read!!

How do I know when my chain has elongated beyond its service life?

A. Besides the obvious signs of long-term wear, rust, "hooked" sprocket teeth and bound links; There is a mathematical formula for determining when the chain needs to be replaced. Below is an example using a 120 link, 520 pitch chain.

A= # of Links (We'll use 120 for an example)
B= .625 for 520 pitch chain. (Measurement of center of pin to center of pin)
C=.03 (ratio of wear)

(A x B)=Y
(Y x C)=Z
(Y + Z)=X

X=When the chain exceeds this length - replace the chain!

Example:

(120 x .625)=75
(75 x .03)=2.25
(75 + 2.25)=77.25"

You should replace this chain when its length exceeds 77.25".

How should I maintain my non-O-ring chain?
Doing routine maintenance on any chain is a crucial step to getting the maximum wearlife out of your chain. You should :

• clean and check its adjustment every 400 miles (sooner if the chain gets excessively dirty).
• Use Formulated o-ring chain cleaner or other similar product to keep dirt from building up around link plates and rollers.
  
• You can hose off a non-O-ring chain, but be sure to use a moisture displacement product (like WD40) after the chain comes in contact with water. After your chain has been cleaned you should apply a quality chain lube. Wipe away any excess lube, so that it does not attract dirt.

How should I maintain my O-ring chain?

Doing routine maintenance on any chain is a crucial step to getting the maximum wearlife out of your chain. You should

• clean and check its adjustment every 400 miles (sooner if the chain gets excessively dirty).
• Use formulated O-ring chain cleaner or other similar product to keep dirt from building up around link plates and rollers. Don’t use a wire brush or pressure washer.
  
• If your chain comes in contact with water, be sure to use a moisture displacement (like WD40). Lubing an O-Ring chain is vital for maximum wearlife. All RK O-Ring chains are injected at the factory with a lifetime supply of internal lubricant. The purpose of an O-Ring lube is to keep the chain from rusting and the O-rings from drying out.
  
• Use a lubricant specifically designed for O-Ring Chains.

Reference : RK excel america, Takasago Chain