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Old 09-15-05, 02:27 PM   #1
BryE
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Shimano 105 rear derailleur max cog?

Hi, guys

I have a 105 7-speed rear derailleur, model rd-1055. I believe the Shimano spec for this part says the max cog it can take is 27. However, I may want to cheat a bit with it and use it with a 28-tooth max cog. Is this possible? Is there anything special I would need to do in order to accomplish this?

Thanks!
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Old 09-15-05, 03:04 PM   #2
sydney
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Originally Posted by BryE
Hi, guys

I have a 105 7-speed rear derailleur, model rd-1055. I believe the Shimano spec for this part says the max cog it can take is 27. However, I may want to cheat a bit with it and use it with a 28-tooth max cog. Is this possible? Is there anything special I would need to do in order to accomplish this?

Thanks!
Actually,the spec was 28(there was no 27 in 7 speed 105 days) and it will likely handle more like the current stuff.Adjust the B tension screw.
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Old 09-15-05, 03:12 PM   #3
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Originally Posted by sydney
Actually,the spec was 28(there was no 27 in 7 speed 105 days) and it will likely handle more like the current stuff.Adjust the B tension screw.
Fantastic. Thanks!
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Old 09-15-05, 03:27 PM   #4
Sheldon Brown
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Originally Posted by BryE
Hi, guys

I have a 105 7-speed rear derailleur, model rd-1055. I believe the Shimano spec for this part says the max cog it can take is 27. However, I may want to cheat a bit with it and use it with a 28-tooth max cog. Is this possible? Is there anything special I would need to do in order to accomplish this?
No problem. Generally these will handle up to about a 30 tooth, unless your frame has a non-standard dropout hanger.

See: http://sheldonbrown.com/capacity for a detailed explanation.

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Old 09-15-05, 04:48 PM   #5
cuda2k
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I'll agree with the above that a 28 works without problem. I haven't tired it myself, and sheldon certainly knows more than I, but I'd say 30 would be a mighty tight fit judging by the clearance on my 105 rear and the 28 tooth.
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