How will I know when my rear cassette needs replacing?

[Bigtallfatbloke]

...and the front chain rings come to that. I hav edone iro 4000 miles on this thing and I am off to ride the length of Germany in July. Should I replace the cassette before I go? I have no idea if it needs a new one or not, or how long I should expect to get out of it? It is a shimano ...as supplied on new Dawes galaxies.

 

[Dave5N]

When you stand on the pedals and nadger yerself on the top tube!

 

[Bigtallfatbloke]

right.

 

[Twenty Inch]

Broadly speaking, if the distance between teeth is 2x wider than the teeth are high.

You can measure your chain stretch too. 10 links = 10 inches. If it's more than that, the chain needs replacing, which means the cassette does too.

Anyway, you've answered your own question - get it done before you go to Germany.

 

[mickle]

If you replace your chain on a regular basis your cassette and rings will last a decade or more.

 

[joebe]

If it starts jumping is a good sign. I'd replace the cassette and chain, though I very much doubt you'll need to change the chainring yet

 

[itisaboutthebike]

If you replace your chain on a regular basis your cassette and rings will last a decade or more.

I've never heard such drivel !

yes - quite possibly - but only if you do a few hundred miles a year.

It all depends on how many miles you do and in certain circumstances how you change gear (changing gear 'gently' - by backing off the pressure when chainging gear - will increase cassette life. Altho this isn't always possible in a racing scenario).

Oh and also using a decent chain lube..............

 

[02GF74]

You can measure your chain wear too. 10 links = 10 inches. If it's more than that, the chain needs replacing, which means the cassette does too.

^^^^ that is never right.

Dunno where I got the number from but once 10 links measure 127.6 mm, the chain is worn - I believe the rule of thumb is 1% longer than a new chain.

If you catch the cain at this length, you can run 3 or more chains on the same cassette, otherwise the cassette is too worn and a new chain will jump on it so you need to replace the cassette too.

Annoying part is that you'll find it jumping only on 3 or 4 gears but you cannot buy them spearately (shimano I'm talking about).