Do I need a derailleur extension?
#1
Junior Member
Thread Starter
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.0
#2
Senior Member
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
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
Last edited by subgrade; 09-13-19 at 08:26 AM.
#3
Junior Member
Thread Starter
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
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
#4
Full Member
#5
Senior Member
Compare it to the pictures in Shimano's site, both versions look slightly different (the paralelogram and the clutch area). Looks like you've been given the wrong one. The model name should be somewhere on the back of the paralellogram, check for it.
Last edited by subgrade; 09-13-19 at 08:47 AM.
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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.
#13
Cycleway town
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.
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.