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Shimano Deore M591 9 Speed Rear Mech

Shimano Deore M591 9 Speed Rear Mech
$37.81
RRP: $61.73
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Deore top normal rear mech in black.
  • Next Day & World Wide Shipping
  • Excellent Customer Service
  • Buy in Store
Code: RDM591SGSL
  • Wide link top normal Deore rear derailleur
  • Wide link design increases rigidity and service life
  • Top normal return spring lends to incredibly intuitive operation when combined with Rapidfire shifters
  • Alloy and steel construction leads to lower weight without compromising strength and durability
  • Large 11 tooth pulleys are used for longer life
  • Two fluorine-coated link bushings for low-friction operation
  • 8- and 9-speed compatible
  • Compatible with 28-34T low sprocket
  • Average weight 299 grams
Free shipping on this item to United Kingdom
  • Estimated delivery transit time: 1-3 days
  • Royal Mail Standard 1-3 Days: $0.00
    Royal Mail standard parcel service, delivered to your door by your local postman. Deliveries are Monday to Saturday, normally 1-2 days transit time.
  • Royal Mail 1st Class 1-2 Days: $3.09
    Royal Mail 1st class parcel service, deliveries are Monday to Saturday with 95% of parcels delivered next working day. Depending on order value the parcel may be send recorded delivery.
  • Royal Mail Special Delivery 1 Day: $6.95
    Royal Mail's premium UK service. Order by 2.30pm for next day delivery by 1pm. Delivery Monday to Friday only, orders from late Friday / Saturday will be delivered the following Tuesday.
  • DPD Next Day 1 Day: $6.95
    The UK's best home delivery service, next day delivery. DPD will email and text (if mobile number is provided) a one hour delivery window. You can text or email back to change the day or have the parcel left with a neighbour if needed. Your parcel is fully traceable at all times.

    Order before 2.30pm Monday to Thurday for next day delivery. Orders from Friday will be delivered on Monday. Orders from late Friday and over the weekend will be delivered on Tuesday.

    Please note we use this service for handbuilt wheels, in this case please allow for the build time.
  • DPD Saturday 1 day: $12.34
    DPD Saturday Delivery. Please order before 2.30pm on Friday for this service.
    Not available to the Highlands and Northern Ireland.
    If your order before 2.30pm on a Thursday the depot will hold onto your parcel and delivery on the Saturday.
  • DPD Saturday Pre 12 Noon 1 Day: $15.36
    DPD Saturday Delivery before 12 Noon. Please order before 2.30pm on Friday for this service.
    Not available to the Highlands and Northern Ireland.
    If your order before 2.30pm on a Thursday the depot will hold onto your parcel and delivery on the Saturday.
General information about our shipping
***** on 24/05/2014

I would not have thought it but this mech runs better on my drive train than my old XT did before it was damaged. Top marks to Merlin too for good advice before my purchase and excellent delivery time

**** on 22/10/2013

A very well priced mech with features which were just available on higher end mechs a few years ago. Seems strong and just the job for an everyday bike.

***** on 13/08/2013

Used this derailleur with a SRAM 1070 12-32 cassette and Ultegra 10sp shifter to add a lower gear. Shifts as smoothly as the Ultegra derailleur it replaced. Much cheaper to go this route than to upgrade to Ultegra 6800 just to add a 32.

***** on 02/08/2013

Great rear mech accurate shifting easy to set up, a massive improvement on my old Alivio 8sp. Great price and quick delivery from merlin too.

***** on 11/05/2013

Great quality cheap mech! Not quite XT but very good for the money. Using it on a 10 speed mtb cassette with 105 shifters as the dyna-sys mechs were not compatible. Shifting not quite as slick as the original 105 mech but still works fine.

***** on 05/04/2013

Great rear mech at a great price. Get yourself a brand new cable, too and once adjusted correctly, it shifts like a dream.
Together with a new cassette, it really breathes new life into a worn drivetrain.

***** on 22/03/2013

Excellent quality and price.

***** on 19/03/2013

For the price it is an excellent derailleur and again great savings when purchased from Merlin

***** on 27/02/2013

It's very good.
It's very fast.

***** on 29/01/2013

I love it! Much better than my old Shimano Alivio's rear mech.

**** on 19/12/2012

Good value for money product as a direct replacement for the worn out Deore mech on my bike. It is becoming increasingly difficult to obtain these older parts as Shimano have introduced newer lines.

**** on 11/12/2012

Good value rear mech. Fitted it to a road bike so that I could use a cassette with a 30 sprocket. Runs well with 8 speed down tube shifters. I understand that newer version of Shimano MTB rear mech will not work with road gear levers.

***** on 06/12/2012

Cheapest I can find and best delivery and customer service I have found. Thankyou will be back soon

***** on 30/10/2012

The perfect replacement, easy to fit, and the cheapest price to be found.

***** on 04/09/2012

Bought this to go with a 10/34 cassette on my road bike (lots of steep hills locally & I'm getting older!)

Reasonably easy to fit, looks good and works well.

Arived very quickly after the order - good service.

***** on 15/07/2012

A replacement for a very worn out Deore rear mech on my Sirrus Sport which has done nearly 5000 miles. Absolutely brilliant for the money and shifting is smooth and accurate again. Service from Merlin was faultless.

***** on 26/06/2012

It's a rear mech, it changes gear at the rear. It looks good in black because everything does. What makes it special is it's the cheapest on the web and it was delivered the next day by Merlin, first class as per usual.

***** on 22/06/2012

I purchased this item to get the long arm to put onto an Ultegra 10 speed derailleur, which had the same pin type mount fix.
It allows me to use a 36 tooth rear cassette with a compact two speed crank with no problems.
I just swap the arms.
There seems to be two different types of locks to hold the derailleur arms to the bodies, even for the same named derailleur.
One type has a pin at 90 degrees to the shaft and the other has a slip-over arm with a bolt through the swinging arm, so please be careful.
The arm is longer than the 'GS' models of 105, Ultegra and Dura-Ace.
The Deore body is not used.

***** on 21/06/2012

Although ALIVIO was used until now, the gear became smooth after changing into DEORE.

***** on 19/06/2012

excellent rear mech for the cost - looks good, easy to fit and smooth changing once on; would happily purchase again

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