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Old 08-09-08, 06:44 PM   #1
EdYago
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Short vs Long cage derailleur

I've read that long cage derailleurs shifter smoother than short but on a 20" wheel, there's not much clearance.

So, my questions are:

1) Is there a big difference in performance?

2) Is the low clearance too big of a problem? Will I scrape the cement on a sharp turn?

Thanks.
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Old 08-10-08, 12:15 AM   #2
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Originally Posted by EdYago View Post
I've read that long cage derailleurs shifter smoother than short but on a 20" wheel, there's not much clearance.

So, my questions are:

1) Is there a big difference in performance?

2) Is the low clearance too big of a problem? Will I scrape the cement on a sharp turn?

Thanks.
Only real reason for long or mid cage is for taking up excess chain. If you have a "pinecone" rear cluster, of say 22 or 24 to 11 teeth you do not need a mid or long cage, if you are running a cluster with say a range of 32 or 36 to 12 or 14, then a long cage is required, a short cage would not be able to handle the amount of chain for the gear spread.

Even with 3/4 inch ground clearance for the bottom pully, I doubt you would scrape the derailure, unless you drop the bike. Lean a bike over sometime, and you will see what I mean, unless you slide the bike, the derailure will not touch the ground.
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Old 08-10-08, 12:27 AM   #3
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I have a long cage derailleur on my 20" wheel Raleigh.
It is unlikely to touch the road surface when cornering to the right side as the pedal will strike first, if at it's lowest position.
However, mine has made contact when riding onto and off pavements.
The other problem is that, since the chain is so low, it picks up grit from the road.
Otherwise it's OK.
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Old 08-10-08, 01:06 AM   #4
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My Downchoobe has a long cage. It is so far, intact, and hasn't made grooves in the road.
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Old 08-10-08, 07:37 AM   #5
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Quote:
Originally Posted by EdYago View Post
I've read that long cage derailleurs shifter smoother than short but on a 20" wheel, there's not much clearance.

So, my questions are:

1) Is there a big difference in performance?

2) Is the low clearance too big of a problem? Will I scrape the cement on a sharp turn?

Thanks.
I have never noticed any difference in performance. As written earlier, the big motivation is the amount of chain it can pull.

Derailer clearance is generally not an issue on pavement. Although if you are on paths or off road with roots, sticks, and such, a long cage derailer on a small wheel is definitely low enough to hit stuff.
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Old 08-10-08, 08:45 AM   #6
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SRAM mountain bike short cage derailleurs can handle up to 34t no problem, so if you just have a single chainring in front and an 11-34t in the rear, you can use an SRAM mountain bike short cage derailleur along with a compatible shifter.

I have an X.9 short cage on my Tikit that I put an 11-32t cassette. I use an X.0 shifter and have no problems with the derailleur taking up the slack. The manual for the derailleur states the compatibility with 34t.

Just countering some views that you need a medium or long cage derailleur if you use a cassette with 32 or 34t.
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Old 08-10-08, 09:33 AM   #7
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If this is still about your Mu, iamstuffed is right: your Neos should have no problems shifting a 9-sp cassette 11-34 as long as you keep the single up front.
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Old 08-10-08, 03:23 PM   #8
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Quote:
Originally Posted by EdYago View Post
I've read that long cage derailleurs shifter smoother than short
This is incorrect. It's the exact opposite.
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