New crankset - new rear deraileur??

[simmoclayto]

Hi there


I am looking at getting a new crankset, and ultimately ill need a new chain and cassette. Does this mean i have to obtain a new rear derailleur??
about 3000kms have been done.
Cheers

Simon

 

[capwater]

Hi there


I am looking at getting a new crankset, and ultimately ill need a new chain and cassette. Does this mean i have to obtain a new rear derailleur??
about 3000kms have been done.
Cheers

Simon

Simon says "No". Measure your chain. If you replace your chain before it reaches it's limit your cassette should be OK.

 

[DMF]

No need to replace the derailleur. They practically never wear out. After a while the teeth on the little cogwheels will wear out, but if you keep your chain in decent shape, that will take quite a while since they aren't under much load.

Why are you replacing the chain etc? Because they're worn out?

 

[carbonguru]

Your RD should be OK if it is shifting smoothly. Check your chain and your cogs. Replace any worn parts.

Hi there


I am looking at getting a new crankset, and ultimately ill need a new chain and cassette. Does this mean i have to obtain a new rear derailleur??
about 3000kms have been done.
Cheers

Simon

 

[stea1thviper]

Also one thing I would add is that you make sure you chain is the right length. As I found out recently, a chain not the right length can cause some rough shifting. I found this site really helpful: http://www.machinehead-software.co.uk/bike/chain_length/chainlengthcalc.html

 

[hd reynolds]

Hi there


I am looking at getting a new crankset, and ultimately ill need a new chain and cassette. Does this mean i have to obtain a new rear derailleur??
about 3000kms have been done.
Cheers

Simon

If the RD is not broken you dont need a new one. Just make sure the new cassette is compatible or similar (specs.) to the one it's replacing.

 

[PeterF]

Hi there


I am looking at getting a new crankset, and ultimately ill need a new chain and cassette. Does this mean i have to obtain a new rear derailleur??
about 3000kms have been done.
Cheers

Simon

If you're going from a standard double (53/39) with a short cage rear derailleur to a triple than "yes" you will need a long cage derailleur to pick up the extra chain slack when in the small chainring. If going from double to double than no. One thing to consider is that short cage rear derailleurs have limits on the size of the rear cogs. A Campy short cage is recommended for a max rear sprocket of 26t. I've heard differnt opinions on compact cranksets. Personally, If I put a compact on, I would try it first before spending the money on a new rear d.