Rear derailleur advice please

SexyGreyFox · 26 May 2021 at 18:47

Coming home my bike started to act up, looked down and the rear derailleur had decided to break.
My problem is that it is a Shimano RD R350 10 speed and the only one I can find is second hand.

Does anybody know what a direct replacement would be now or can I just buy a 10 speed Shimano?
Would the short cage version make any difference if I can only get that?

Thanks

robj20 · 26 May 2021 at 18:51

Short cage won't work if you have more than one chain ring.

SexyGreyFox · 26 May 2021 at 19:08

robj20 said:
Short cage won't work if you have more than one chain ring.

Thanks

Jonny ///M · 26 May 2021 at 20:12

Looks like you may have short cage already? Got a photo?

I'd say a 105 5701 derailleur would be compatible or a Tiagra 4601. Tiagra 4700 won't work.

SexyGreyFox · 26 May 2021 at 20:35

As you can see it's been in the wars

It is this bike - https://archive.trekbikes.com/us/en/2015/Trek/7_5_fx#/us/en/2015/Trek/7_5_fx/details

https://www.dmpoole.co.uk/pics/shimanordr350.jpg

Jonny ///M · 26 May 2021 at 20:40

Yeah that's ******. Looks like a short cage but short cage 105 won't work on any cassette above a 30 sprocket.

The GS 105 says 32t max but would get away with it on a 34t in my experience.

SexyGreyFox · 26 May 2021 at 21:13

Jonny ///M said:
The GS 105 says 32t max but would get away with it on a 34t in my experience.

To be honest I never go to that gear anyway and I've fixed it so that I never go out of the outer ring.
So does your expertise recommend the 105 5701 derailleur?
Or anything else?

Jonny ///M · 26 May 2021 at 22:42

Get a 5701 105 GS to be safe.

I'm sure you could run a Sora R3000 mech also but Shimano may say otherwise.

SexyGreyFox · 26 May 2021 at 22:49

Thanks

SexyGreyFox · 27 May 2021 at 12:15

@Jonny ///M

I have a SL-4600 shifter on my bike, do you reckon this derailleur should be OK? - https://www.ebay.co.uk/itm/254924790134?hash=item3b5ab39976:g:u6kAAOSwUkVgZccD

Jonny ///M · 27 May 2021 at 12:47

Yeah that'll be fine .

SexyGreyFox · 1 Jun 2021 at 20:34

@Jonny ///M

Typical.
While waiting for my derailleur to come I decided to give my bike a good clean, I then counted the gears on the cassette and there are 9 :eek:

No wonder the gears have never flowed correctly, sometimes I have to click twice to go to another gear but it's been fine for 3 years when it was the last time I bought a cassette for it.
I've looked at my old receipts and I did order 10 speed but obviously didn't check it.
A 10 speed is on the way.

jpaul · 1 Jun 2021 at 21:07

good article on compatability https://bike.bikegremlin.com/1278/bicycle-rear-derailleur-compatibility/
my mechs spring broke I ended up getting a new long cage Claris RD-R2000 8-speed circa £20 off ebay, which will work for 9, it's build is ok.

claris derailleur cage looks like the one in your picture - it's not as rust resistant as its alloy predecessor, but I didn't want to pay megabucks

SexyGreyFox · 1 Jun 2021 at 21:35

jpaul said:
good article on compatability https://bike.bikegremlin.com/1278/bicycle-rear-derailleur-compatibility/

I've saved that