Correct derailleur?

livpoksoc

Veteran
Location
Basingstoke
I have a 2014 105 10 speed groupset, and have just upgraded my cassette from an 11-30 to 11-32. I got a new chain at the same time, however I didn't realise I had to also get a larger derailleur.

I'm not up to speed on these things, so how can I tell which dersilleur is correct - as I also heard that later versions aren't compatible?
 

Spiderweb

Not So Special One
Location
North Yorkshire
You could use one of these extenders, cheaper than a new derailleur;
https://www.sjscycles.co.uk/gear-spares/aluminum-rear-derailleur-hanger-extender/
 

roubaixtuesday

self serving virtue signaller
I have a 2014 105 10 speed groupset, and have just upgraded my cassette from an 11-30 to 11-32. I got a new chain at the same time, however I didn't realise I had to also get a larger derailleur.

I'm not up to speed on these things, so how can I tell which dersilleur is correct - as I also heard that later versions aren't compatible?
I think, but am by no means certain, you will be sorted with the medium one here.
https://www.wiggle.co.uk/shimano-10...ano drivetrains,Cage: 22T, total capacity 40T
 

Juan Kog

permanently grumpy
Its not clear from your post , have you tried running the new set up with your original derailleur. I have found mr shimano can be quiet cautious with there gear capacity, so with your slightly larger cassette it may still run smoothly.
 
OP
livpoksoc

livpoksoc

Veteran
Location
Basingstoke
Its not clear from your post , have you tried running the new set up with your original derailleur. I have found mr shimano can be quiet cautious with there gear capacity, so with your slightly larger cassette it may still run smoothly.
I had and was getting terrible grinding noises in the 32t ring. Turns out the original derailleur was sold as 'up to 28t', but the shop said it can handle 30t.
 

Ajax Bay

Guru
Location
East Devon
I have a 2014 105 10 speed groupset, and have just upgraded my cassette from an 11-30 to 11-32. I got a new chain at the same time, however I didn't realise I had to also get a larger derailleur.
Shimano 10sp 105 RD- what is the model? eg RD-5700 RD-5600 is specc'ed for 27t; RD-5700 for 28t and the 5701 for 30/32t.
Why do you think you need an RD with a longer cage (than the one you have)? SS and GS have a difference in specified 'wrap capacity' rather than largest sprocket (33t up to 39t for the GS).
What is the distance between the axes of the two jockey wheels?
You may find that screwing in the 'b' screw helps, or even reversing it, to allow it to manage the 32t sprocket.
 
Last edited:
OP
livpoksoc

livpoksoc

Veteran
Location
Basingstoke
Shimano 10sp 105 RD- what is the model? eg RD-5700 RD-5600 is specc'ed for 27t; RD-5700 for 28t and the 5701 for 30/32t.
Why do you think you need an RD with a longer cage (than the one you have)? SS and GS have a difference in specified 'wrap capacity' rather than largest sprocket (33t up to 39t for the GS).
What is the distance between the axes of the two jockey wheels?
You may find that screwing in the 'b' screw helps, or even reversing it, to allow it to manage the 32t sprocket.
Not sure of the model number. Is it printed anywhere? My groupset is a bit of a mishmash (sram cranks, tektro calipers), but the levers and derailleur is 105. The bike was bought in 2014. As I understand it, later 105s don't do 10 speed, but otherwise I am clueless.
 

Ajax Bay

Guru
Location
East Devon
Look on the back of the parallelogram of the RD. Measurement between the two pulley wheel bolts in mm will tell you/us whether it's SS or GS.
 
OP
livpoksoc

livpoksoc

Veteran
Location
Basingstoke
My local mechanic confirmed it needs to be long cage, 5700. Like gold dust apparently. He's set me up on a mtb one that will do for now.
 

Ajax Bay

Guru
Location
East Devon
Gold dust? But I'm sure the MTB one will be fine.
https://www.bikingbarn.co.uk/shimano-rd-5700-105-10-speed-rear-derailleur-gs
Shimano RD-5701 105 10 Speed Rear Mech Medium Cage
10-speed 105 wide link rear derailleur medium cage - GS
Advanced Wide Link design increases rigidity and shifting performance
Super stiff for fast and accurate changes across the cassette
Large 11 tooth pulleys increase service life and reduce noise
Super light shift action
Compatible with 10-speed drivetrains
Maximum low sprocket 32T with double chainset
Maximum front difference 22T, total capacity 40T
Average weight 232 grams
Or: https://www.sjscycles.co.uk/derailleurs-rear/gs-shimano-105-rd5701-10-speed-rear-derailleur-black/
 
OP
livpoksoc

livpoksoc

Veteran
Location
Basingstoke
Gold dust? But I'm sure the MTB one will be fine.
https://www.bikingbarn.co.uk/shimano-rd-5700-105-10-speed-rear-derailleur-gs
Shimano RD-5701 105 10 Speed Rear Mech Medium Cage
10-speed 105 wide link rear derailleur medium cage - GS
Advanced Wide Link design increases rigidity and shifting performance
Super stiff for fast and accurate changes across the cassette
Large 11 tooth pulleys increase service life and reduce noise
Super light shift action
Compatible with 10-speed drivetrains
Maximum low sprocket 32T with double chainset
Maximum front difference 22T, total capacity 40T
Average weight 232 grams
Or: https://www.sjscycles.co.uk/derailleurs-rear/gs-shimano-105-rd5701-10-speed-rear-derailleur-black/
Funnily enough I'm on an MTB one as a stop gap, but thanks for these links. Will discuss with the guy doing the repair.
 
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