Short, medium or long cage rear derailleurs ?

[woodbutchmaster]

The scenario would be , 9spd. cassette and triple crankset . Is there a total no-no for any combination of derailleur / crank or is there only one obvious (except to me) choice?
Any and all advice/opinions gratefully received !

 

[vickster]

How many teeth on the biggest cog on cassette? What brand, Shimano, SRAM, Campag, assume Shimano if a triple?

 

[Mo1959]

My only triple is an elderly Cube peloton with triple Sora. 50/39/30 chainset and 11/32 cassette. I really like the spread of gears on it.

 

[Cycleops]

My only triple is an elderly Cube peloton with triple Sora. 50/39/30 chainset and 11/32 cassette. I really like the spread of gears on it.

That's pretty much an ideal set up and should cover you for most situations.

 

[Mo1959]

That's pretty much an ideal set up and should cover you for most situations.

Yes, one of my cheapest bikes, yet the one I probably enjoy the most.

 

[Cycleops]

Really depends on the biggest cog on the cassette . If it's north of 32t then a long cage is best but you could run a close ratio with a short cage which would arguably give you the snappiest gear changes and be better to maintain your cadence.

 

[Mike_P]

Useful advice https://www.mantel.com/blog/en/derailleur-capacity-maximum-techcenter

 

[woodbutchmaster]

How many teeth on the biggest cog on cassette? What brand, Shimano, SRAM, Campag, assume Shimano if a triple?

34 teeth not sure of the brand it was on the wheel set when l bought them .There are the letters HJ on the latest ring if that means anything ?

Really depends on the biggest cog on the cassette . If it's north of 32t then a long cage is best but you could run a close ratio with a short cage which would arguably give you the snappiest gear changes and be better to maintain your cadence.

34 teeth thanks for the info. re the short cage.

 

[woodbutchmaster]

How many teeth on the biggest cog on cassette? What brand, Shimano, SRAM, Campag, assume Shimano if a triple?

34 teeth

 

[Mike_P]

Defo a long cage. A shorter cage will work with the smaller chainwheels but on the largest you can most likely say hello to a broken rear derailleur.

 

[woodbutchmaster]

How many teeth on the biggest cog on cassette? What brand, Shimano, SRAM, Campag, assume Shimano if a triple?

Many apologies , was trying to do two things at the same time (not my strongest ability) . It is an old Campagnolo cassette and the big ring has 25 teeth. And on the chainring the teeth are 48 , 39, 30 also old Campagnolo

 

[woodbutchmaster]

Defo a long cage. A shorter cage will work with the smaller chainwheels but on the largest you can most likely say hello to a broken rear derailleur.

Defo a long cage. A shorter cage will work with the smaller chainwheels but on the largest you can most likely say hello to a broken rear derailleur.

Many apologies , was trying to do two things at the same time (not my strongest ability) . It is an old Campagnolo cassette and the big ring has 25 teeth. And on the chainring the teeth are 48 , 39, 30 also old Campagnolo

 

[woodbutchmaster]

Really depends on the biggest cog on the cassette . If it's north of 32t then a long cage is best but you could run a close ratio with a short cage which would arguably give you the snappiest gear changes and be better to maintain your cadence.

Many apologies , was trying to do two things at the same time (not my strongest ability) . It is an old Campagnolo cassette and the big ring has 25 teeth. And on the chainring the teeth are 48 , 39, 30 also old Campagnolo

 

[Cycleops]

If 25t cassette then a short cage will give you the slickest change.

 

[woodbutchmaster]

If 25t cassette then a short cage will give you the slickest change.

Great, thank you that is the answer l was hoping for !