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Any success with a long cage road rear derailleur working with a 11-32 cassette?
I'm considering adding a 11-32 mtb 9 speed cassette to my cross bike to lower the gearing for some of the sustained 6-8% climbs of my local forest roads. My bike is already equipped with a D/A 9 speed rear derailleur (long cage, I believe; is there a way to tell if unsure?), a 12-25 cassette, and a 38/48 crankset. A mtb cassette would be more affordable than going to a compact crankset at this point.
I've read that the max cog is 27t for the D/A long cage der., but I've heard of rumors that people have had success with a 11-32 cassette without having to go to a mtb rear derailleur. Anyone here successfully try this? |
You will need an MTB cage length derailleur or and actual long cage derailleur. I don't know new shimano so I can't tell you if what you are referring to as "dura-ace long cage" is actually an MTB length cage or a medium cage.
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Originally Posted by docbluedevil
I'm considering adding a 11-32 mtb 9 speed cassette to my cross bike to lower the gearing for some of the sustained 6-8% climbs of my local forest roads. My bike is already equipped with a D/A 9 speed rear derailleur (long cage, I believe; is there a way to tell if unsure?), a 12-25 cassette, and a 38/48 crankset. A mtb cassette would be more affordable than going to a compact crankset at this point.
I've read that the max cog is 27t for the D/A long cage der., but I've heard of rumors that people have had success with a 11-32 cassette without having to go to a mtb rear derailleur. Anyone here successfully try this? |
The cage length has NOTHING to do with the maximum sprocket the RD can handle.
Both short-cage and long-cage Shimano road RDs are intended for sprockets up to 27T, but in practice they almost always work with 30T, and sometimes even 32T or 34T - I think it depends on derailer hanger geometry and chain tension. I have a road bike with an 11-30 MTB cassette and a short-cage Tiagra RD, it works fine, but the "B-tension" screw on the RD is tightened to the max. |
Originally Posted by mozgj
The cage length has NOTHING to do with the maximum sprocket the RD can handle.
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Originally Posted by mozgj
The cage length has NOTHING to do with the maximum sprocket the RD can handle.
It increases the slack capacity, not the cog size capacity. |
DMF is right--cage length will increase capacity--of your crankset, not the cassette. Long cages are required with triple cranks to maintain chain tension with the large different between the smallest and largest chainrings.
Like someone else said, you should be able to get away with a 30 on the back with your current derailleur, you might have to crank the B screw in a ways but is should work. |
Originally Posted by DMF
Uhhh... what?
It increases the slack capacity, not the cog size capacity. Long-cage (SGS) derailers have greater takeup capacity, and work with all types of cassettes. Long-cage derailers are commonly called "mountain" derailers currently, though in the past, this style of derailer was known as a "touring" derailer. (The marketeers retired the use of "touring" as a buzzword in the late '80s when mountain bikes became the hot item.) |
Originally Posted by john_iverson
DMF is right--cage length will increase capacity--of your crankset, not the cassette. Long cages are required with triple cranks to maintain chain tension with the large different between the smallest and largest chainrings.
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