Do I need a derailleur extension?
I have installed Deore derailleur GS on a 10s cassette where the largest cog is 42T. When I shift to the 9th cog, it rubs with the derailleur. It seems the cage is not going under the cog. Do I need an extension? See attachment pic.https://cimg4.ibsrv.net/gimg/bikefor...f63e400cc7.jpg0
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According to Shimano specs that derailleur is 42T compatible.
https://bike.shimano.com/en-EU/produ...-M6000-GS.html Edit: upon closer inspection it looks that what you have is in fact the SGS version which is rated only for 36T. Then yes, you need a derailleur extension for it to work with 42t casette. https://bike.shimano.com/en-EU/produ...M6000-SGS.html |
Originally Posted by subgrade
(Post 21120928)
According to Shimano specs that derailleur is 42T compatible.
https://bike.shimano.com/en-EU/produ...-M6000-GS.html Edit: upon closer inspection it looks that what you have is in fact the SGS version which is rated only for 36T. Then yes, you need a derailleur extension for it to work with 42t casette. https://bike.shimano.com/en-EU/produ...M6000-SGS.html |
Originally Posted by alij2018
(Post 21120875)
When I shift to the 9th cog, it rubs with the derailleur. It seems the cage is not going under the cog. Do I need an extension?
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Originally Posted by alij2018
(Post 21120945)
Hi, no it is GS. According to where I bought it.
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I will check the name tomorrow. So, what's the quick solution now? Extension? I do not want to play with B screw.
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Seems to me the quick solution is to check that you bought the right thing and take it back if you didn't.
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Originally Posted by alij2018
(Post 21120974)
I will check the name tomorrow. So, what's the quick solution now? Extension? I do not want to play with B screw.
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Originally Posted by BlazingPedals
(Post 21121421)
Why is your Q/R skewer on backwards?
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I know, I put the wheel faster earlier. Tomorrow will reverse it. I ordered an extension by the way.
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Sometimes it is just a matter of getting the setting on the "b" screw correct. I didn't like the way the SRAM X7 RD performed on my recumbent trike with an 11-36 cassette so I switched to Shimano. I used the guidance offered by the Sheldon Brown website to buy the right Shimano derailleur. They warned it would not work right with the b screw sent by Shimano but switching to a longer b screw would allow the RD to clear the 36. They were right. It's been in use now for 6+ years and shifts perfectly. Before you take it back, try adjusting the b screw.
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It works i adjusted the B screw. I bought the extension in vain. I will sell it on ebay.
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Extensions can cause poor shifting, as it reduces the angle/force of the chain against the next cog, due to the jockey being further away.
It's important you use a cassette within the rated range of the derailleur, and adjust the B-screw accordingly, so the jockey is the correct distance from the cassette rings. Your derailleur has a switchable clutch, you need this in the 'on' position when in use, only off when working on the bike. |
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