How often change cassette and chain

[dommisse]

Just been told my chain and cassette of 7 months needs replacement - that is about 7000 to 8000 km. It is Ultegra.

 

Is this normal? Will Dura-ace last longer?

[Johan Bornman]

Chains and cassettes don't see age, they just see miles overlaid by cleanliness.

 

My aunt Edna has a bike in teh garage that is 42 years old with the original chain and cassette, both in perfect condition.

You have one that is 7 months old but did many miles more than aunt Edna's bike.

 

Provided they measured the chain in an honest way and did an honest assessment of why the new chain won't work with the old cassette, this is normal.

[petatodd]

Get a chain measurer.

 

at 0.75 you need to change the chain

at 1.0 you need to change the cassette as well

[BMXER]

If you have done 7000 km in a single chain and casette, chances are its all worn out. Invest in a chain checker and you will end up using one casette with many chains but importantly more than 7000km.

[Breezer]

Ry hom tot hy begin spring. Ek ry myne tot so 15000km en vervang hom dan.

[scotty]

Get a ruler and measure it

 

 

Measuring Chain Wear

The standard way to measure chain wear is with a ruler or steel tape measure. This can be done without removing the chain from the bicycle. The normal technique is to measure a one-foot length, placing an inch mark of the ruler at the side of one rivet, then looking at the corresponding rivet 12 complete links away. On a new, unworn chain, this rivet will also line up exactly with an inch mark. With a worn chain, the rivet will be past the inch mark. [For accurate measurement, the chain should be held under some tension -- either on the bicycle, or hanging. Also, use a metal ruler or tape measure. Wood, plastic and cloth all can expand or shrink.-- John Allen]

This gives a direct measurement of the wear to the chain, and an indirect measurement of the wear to the sprockets. first, let's look at how to do this with a ruler that measures in inches.

• If the rivet is less than 1/16" past the mark, all is well.
  
• If the rivet is 1/16" past the mark, you should replace the chain, but the sprockets are probably undamaged.
  
• If the rivet is 1/8" past the mark, you have left it too long, and the sprockets (at least the favorite ones) will be too badly worn. If you replace a chain at the 1/8" point, without replacing the sprockets, it may run OK and not skip, but the worn sprockets will cause the new chain to wear much faster than it should, until it catches up with the wear state of the sprockets.
  
• If the rivet is past the 1/8" mark, a new chain will almost certainly skip on the worn sprockets, especially the smaller ones.
  

In metric measurement, 10 links of a new chain are 25.4 cm, or 15 links, 38.1 cm.

• If the rivet is up to 25.5 cm or halfway between 38.2 cm and 38.3 cm, all is well.
  
• If the rivet is a little bit past 25.5 cm, or approaching 38.3 cm, you should replace the chain, but the sprockets are probably undamaged.
  
• If the rivet is approaching 25.7 cm or 38.5 cm, you have left it too long, and the sprockets (at least the favorite ones) will be too badly worn. If you replace a chain at this point, without replacing the sprockets, it may run OK and not skip, but the worn sprockets will cause the new chain to wear much faster than it should, until it catches up with the wear state of the sprockets.
  
• More than that, and a new chain will almost certainly skip on the worn sprockets, especially the smaller ones.
  

[Tubeless]

I assume the above is for any chain..... any make.