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Shimano Deore RD-M591 9 Speed Top Normal Rear Derailleur - Black - SGS / Long Cage

£39.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
Available in black or silver. Deore rear derailleurs are offered in Shadow for off-road MTB and Double-Panto (conventional) which are best suited to Trekking.
- Precise chain movement
- Changes gears smoothly
- Light shift effort
- Using Shimano's classic Double Servo-Panta mechanism
- Versatile design (on/off road)
- Compatible with 28-34T low sprocket
- Maximum Sprocket: 34T
- Minimum Sprocket: 28T
- Aluminium bracket body
- Aluminium plate body
- Steel plate pivot bolt
- Aluminium outer link
- Steel inner link
- Steel inner and outer plate
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Questions & Answers (12) Q & A
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Questions & Answers (12)
Is this ok for 24 speed MTB
08 Jul 2020
8 speed cassette 32-11. 3 speed chainwheel 42-22
You will need to match 8 to 8, 9 speed derailleur will not be suitable, look at -

Thanks - 09/07/20
Will this rear derailleur be any good for a 11-36 rear cassette
28 May 2020
I have a old Marin wolf ridge which have a 9 speed Shimano deore I purchased this Shimano 11-36 cassette but the old derailleur won’t clear the largest you think if I had a longer chain and this rear derailleur it would work.i have three rings on the front.thanks for your help
Hi, it is unlikely as Shimano say max 34 tooth sprocket. Thanks
Replacement for Shimano 105
27 Apr 2020
Hi, just getting back into cycling with my old bike Specialized Sirrus Expert 2009. The rear mech needs replacing, currently Shimano 105 9 speed with 11-28 cassette and 30-42-52 front. Will this model be compatible.

Thank you for you enquiry. Yes this 9 speed rear derailleur will work with the set up that you currently have.
Kind Regards. 27/04/20
10 speed compatible?
01 Feb 2020
I see a previous answer is that this is not 10 peed compatible BUT you have a bike on your website that includes this item as part of a 10-speed set up - Im confused if it whippoorwill 10 speed to not.

The bike I refer to on your site is: Thorn Audax Mk3 555S - Black - Touring/Audax Bike - EX DEMO and the description is

Transmission : Shimano Deore FC-T611 10 Speed Triple Chainset - Black - 48/36/26T - 170mm, Shimano Deore RD-M591 9 Speed Top Normal Rear Derailleur - Black - SGS / Long Cage
The 9 speed Shimano MTB mechs will work with Road 10 (except Tiagra 4700), by the text book, you would match 9-9 and 10-10.

Thanks - 04/02/20
Will this work with 10 speed Shimano ultegra sti shifters?
20 Dec 2019

this rear derailleur is 9 spd so wouldn't be able to work with your setup.
Can I use this with 50/34 chainring & 11/40 cassette?
29 Jul 2019
I need to replace a 9 speed Shimano Sora rear derailleur to accommodate a 50/34 chainring & 11/40 cassette. Will this work, with or without a Wolf Tooth Roadlink?
Hi, we think you will need a derailleur hanger extender to make this work. Try our part 46570. Thanks 30/07/19
Would this be a suitable replacement for my elderly RD-M570?
23 Jun 2019

this will be fine.

Will this mech work with SRAM attack shorty shifter and HG 400 12-36 cassette?
17 May 2019
Yes this would be suitable.

Thanks - 17/05/19
will it work with sora 9 speed sti levers?
02 May 2018
Hi there,

Yes these are compatible with 9 speed Sora levers.

What is the maximum cassette with a triple?
02 Jan 2018

With a triple, as suggested the maximum would be 34T.

What is the maximum size cassette this can work with?
01 Jan 2018
The maximum according to shimano is 34t, but with 36t and 40t cassettes out there for 9 speed setups - is this the mech for the job?
Hi there,

It normally depends on the set up of the front chainset, with a single ring this should be fine to be used on a 36-40T - just adjust the B tension screw.

Spare Pulley Wheels
20 Jul 2016
Could you please indicate which replacement jockey wheels are used for this derailleur.
Many Thanks.

The original replacements for this rear derailleur are no longer available but there are a few compatible alternatives. The best match of these would be the jockey wheels from the Altus RD-M370 which are SJS Cycles part 34586.