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RX100 Rear Derailleur

Old 08-27-17, 06:34 PM
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90sKid
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RX100 Long Cage Rear Derailleur

RX100 7 speed, long cage rear derailleur. Very good condition. Could use a good cleaning.
$30 shipped CONUS + PayPal fees (unless gifted)
Thanks for looking!
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Old 08-28-17, 11:19 AM
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I wonder how big a cog you can run with that. If it will handle a 32 I would like to own it.
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Old 08-28-17, 11:28 AM
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Originally Posted by deephate View Post
I wonder how big a cog you can run with that. If it will handle a 32 I would like to own it.
According to Velobase, the long-cage version has more capacity, but still has a 26T max cog limit. Shimano's specs are conservative, but how much you can fudge it probably depends on your frame: VeloBase.com - Component: Shimano RD-A551-GS, RX100
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Old 08-28-17, 11:42 AM
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Originally Posted by ThermionicScott View Post
According to Velobase, the long-cage version has more capacity, but still has a 26T max cog limit. Shimano's specs are conservative, but how much you can fudge it probably depends on your frame: VeloBase.com - Component: Shimano RD-A551-GS, RX100
Warning: THREAD HIJACK! I have seven speed 105 on a Nishiki Cresta GT. I changed the small chainring to 39 tooth without issues. I put a Sram 11-32 on and the only thing that I have been able to make work fairly well is a Tourney 7 speed long cage.

I this would do the job I would much prefer it!
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Old 08-28-17, 11:50 AM
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Yeah, I know my Deore LX from around the same time period could handle a 34T without blinking. The RX100 long-cage is designed for "road" cassettes used with a triple, for example a 52/42/32 crankset and 13-26 cassette. If you have another crankset that could give you the desired low gear with a 26T (probably 28T if we're being honest) small cog, it would be great and shift really well.
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Old 08-28-17, 03:40 PM
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I have this rear derailleur on one of my bikes. The chainrings are 26/36/46, and the cassette is (7-speed) 11-28.
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Old 08-29-17, 01:21 PM
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I have had success using a 32 with an RX100 in the past. YMMV. For the record, it was with friction shifting.
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Old 08-30-17, 04:32 PM
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Originally Posted by beicster View Post
I have had success using a 32 with an RX100 in the past. YMMV. For the record, it was with friction shifting.
Looks like it is worth a shot!
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Old 09-01-17, 02:13 PM
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I tried an RX100 short-cage paired with a 7-speed 32T cassette & the upper pulley rode directly against the 32T cog. Tried swapping a long cage onto the RX100 body & it didn't improve. Changed to a Deore LX and the problem was solved. I think the road derailleur bodies must set the upper pulley closer to the cogs than mtb derailleurs.
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Old 09-09-17, 05:13 PM
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A long cage will really only help with total capacity, not max sprocket size. As mentioned above, it was intended for road triples with a normal road cassette in the back.

An RX-100 long cage setup would also be bomber for an ultra-compact setup like a 42/24 or something with >16t gap in the front.
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Old 09-09-17, 05:15 PM
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And that's a very fine example of an RX-100 RD. It could go with my FD...
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