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Can a Short Cage RearD handle a triple front?

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Can a Short Cage RearD handle a triple front?

Old 05-17-11, 09:33 AM
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Can a Short Cage RearD handle a triple front?

I have an FSA Energy Triple 53/39/30 and a 12-25 rear. I took off the 30, but still have the crank attached to a 118 BB. My rear mech is a 105 long cage. I am thinking of replacing it with a short cage 33 tooth chain wrap rear mech.

Can this be done with the 118 BB?
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Old 05-17-11, 10:01 AM
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Originally Posted by I_like_cereal
I have an FSA Energy Triple 53/39/30 and a 12-25 rear. I took off the 30, but still have the crank attached to a 118 BB. My rear mech is a 105 long cage. I am thinking of replacing it with a short cage 33 tooth chain wrap rear mech.

Can this be done with the 118 BB?
With the 30t granny gear removed, a short cage rear derailleur can be used. However, a short cage rear derailleur don't work any better than GS models, it will just a couple of grams lighter.
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Old 05-17-11, 10:14 AM
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I read somewhere in the forums that it is do-able as long as you stay out of the big-big combo. Going there might overstretch the rdr and jam it. More function to a long cage besides picking up slack in the granny.
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Old 05-17-11, 10:27 AM
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Originally Posted by juls
the big-big combo.
Cross chaining is bad Mmmkay.

A 105 long cage is about 229g a short cage replacement is 199 grams+/-.
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Old 05-17-11, 10:46 AM
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Originally Posted by juls
I read somewhere in the forums that it is do-able as long as you stay out of the big-big combo. Going there might overstretch the rdr and jam it. More function to a long cage besides picking up slack in the granny.
No, if the chain is installed to the correct length, this will not be a problem. However, the chainline will be an issue when on the big ring of the triple crank. Removing the granny chainring does not resolve this issue.
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Old 05-17-11, 10:56 AM
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Yeah, it will work. But is it worth the 30g? I'd say leave the long cage on there. It isn't hurting anything.
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Old 05-17-11, 11:00 AM
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Since he's not using the granny his total chain wrap is 14 (53-39) plus 13 (25-12) = 27 so the short-cage derailler would work fine. In fact, since it isn't designed to accommodate a 21-tooth difference in cassette cogs, as it would with an 11-32 cassette, it sweeps across the cassette at a shallower angle than a long-cage derailer, thus keeping the guide pulley closer to the cogs, leading to more precise shifting. The only negative would be a chain line disparity when using the 1 thru 4 cogs with the 53-tooth chain ring. But then, that's what the 39-tooth ring is for! Good to go!

Regards,
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Old 05-17-11, 11:13 AM
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Chain would need to be too short to reach Big/Big combo , to not go slack..

just buy a long cage RD, and be done with the problem in question.

the Mountain bike Deore ..

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Old 05-17-11, 12:01 PM
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Originally Posted by Bob Pringle
In fact, since it isn't designed to accommodate a 21-tooth difference in cassette cogs, as it would with an 11-32 cassette, it sweeps across the cassette at a shallower angle than a long-cage derailer, thus keeping the guide pulley closer to the cogs, leading to more precise shifting.
Nope - a 105 long cage isn't designed to handle a 32t rear cog.
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Old 05-17-11, 12:06 PM
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Originally Posted by Retro Grouch
Nope - a 105 long cage isn't designed to handle a 32t rear cog.
It's not designed for a 32 tooth cog, but it will fit and operate perfectly on most bikes. I say "most" bikes, a few bikes with a short hanger will have problems.
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Old 05-17-11, 12:20 PM
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So that I understand.

The rear d will work as long as I am not in 53/25/23/21/20 or 39/12/13/14/15.

I can see it not working in 53/25/23 or 39/12/13 but the others shouldn't be a problem 'cause that's how I shift now. Basically once I hit the middle of the cassette it's time to go to the big ring.
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Old 05-17-11, 12:25 PM
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maybe if one chainring,.. and as the chain climbs to the big cog on the cassette
the short chain pulls the tensioner around and away from the cog.

ran a single chainring with a short cage 80's Chorus and a big rear cluster,
and it worked OK..
tensioner 's swing axis and top pulley were concentric on that RD.
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Old 05-17-11, 01:00 PM
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Originally Posted by I_like_cereal
So that I understand.

The rear d will work as long as I am not in 53/25/23/21/20 or 39/12/13/14/15.
You should be able to use any combination without immediate failure if the chain is sized correctly. The chain will possibly wear more quickly on the small-small combination if it rubs against the big chainring.
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