Nashbar Mountain Rear Derailleur

Item # NA-RDM9
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Nashbar Mountain Rear Derailleur
Introducing the new Nashbar Mountain Bike Rear Derailleur. Nashbar has teamed up with MicroShift once again to bring you our first mountain bike group this will only be available here at Nashbar.
  • Lightweight alloy construction with composite pulleys puts the Nashbar rear derailleur at 229g--that's 20 grams less the a Shimano SLX rear derailleur
  • Compatible with Shimano 8/9-speed drivetrains
> long cage
Nashbar Mountain Rear Derailleur
  • MFPARTNUMBER RD-M55
  • WEIGHT 229g.
  • MATERIAL Alloy
  • COMPATIBILITY Shimano 9 speed
  • MAX. COG 34T
  • MIN. COG 11T
  • CAPACITY 45T
  • MAX. FRONT DIFFERENCE 22T
  • MAX. CHAINRING
  • SPRING TYPE High normal (traditional)
  • CLAMP DIAMETER
  • Rating 4

REVIEW SNAPSHOT®

by PowerReviews
Nashbar Mountain Bike Rear Derailleur
 
4.1

(based on 34 reviews)

81%

of respondents would recommend this to a friend.

Pros

  • Lightweight (25)
  • Easy to use (19)
  • Durable (11)
  • Versatile (10)

Cons

  • Weak (4)

Best Uses

  • Mountain bikes (22)
  • Commuting (16)
  • Road bikes (12)
  • Long rides (9)
    • Reviewer Profile:
    • Avid cyclist (26), Casual/ recreational (5), Competitive cyclist (3)
    • Was this a gift?:
    • No (31)

Reviewed by 34 customers

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Displaying reviews 1-10

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5.0

Exemplary wide range rear derailleur.

By 13billydavid

from Chicago, IL.

About Me Casual/ Recreational

See all my reviews

Verified Buyer

Pros

  • Easy to Use
  • Lightweight
  • Versatile

Cons

    Best Uses

    • Road Bikes

    Comments about Nashbar Mountain Bike Rear Derailleur:

    This derailleur has everything you need in a wide range touring derailleur. It shifts smoothly and wraps a lot of chain. It's also indexable but works great w/ friction shifters. It's very light! Doesn't look too out of place on a classic bike. And the price is unbeatable, you can pay more and get less.

    • Was this a gift?:
    • No

    Comment on this review

    (0 of 5 customers found this review helpful)

     
    3.0

    a substitute for Shimano

    By Russ

    from San Rafael, CA

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Lightweight

    Cons

      Best Uses

      • Commuting
      • Mountain Bikes

      Comments about Nashbar Mountain Bike Rear Derailleur:

      The derailleur has not yet been installed so I cannot provide any in-use feedback, so that is why only the 3 star rating. However, here are my pre-install comments: 1- I bought this Nashbar copy to replace an existing old Shimano XT unit. The catalog description and pricing was enticing enough to give it a try. 2- Physically, the Nashbar unit feels like it will do the job, construction is good, and the upper idler seems to have the proper slack. The appearance is good but very plain; it does not have the Shimano "bling". Of course the pricing says that you aren't paying for bling.

      • Was this a gift?:
      • No

      Comment on this review

       
      5.0

      Works great!

      By Steve

      from Watervliet NY

      About Me Avid Cyclist

      See all my reviews

      Verified Buyer

      Pros

      • Easy to install
      • Easy to Set Up
      • Easy to Use
      • Lightweight

      Cons

        Best Uses

        • Mountain Bikes

        Comments about Nashbar Mountain Bike Rear Derailleur:

        I replaced a totaled XTR with this based on other reviews. It installed in minutes, was easy to adjust by following the included instructions and is lighter than the original.

        • Was this a gift?:
        • No

        Comment on this review

        (3 of 4 customers found this review helpful)

         
        4.0

        Follow up review after 400 miles

        By Cycling for > 25 years

        from Pennsylvania

        About Me Avid Cyclist

        Pros

        • Lightweight

        Cons

          Best Uses

          • Mountain Bikes
          • Road Bikes

          Comments about Nashbar Mountain Bike Rear Derailleur:

          This is a follow up for my previous review below. So far I've put around 400 miles on the derailleur over the past few months and have had ZERO problems with it. After the initial install I haven't had to adjust it at all, and it hasn't missed any shifts at all. I've been using it on a road bike converted over to a flat bar set up, and I've switched the front crank from a double to a triple with this rear derailleur on and no problems at all. I started the bike out with a 53/39 crank, then went to a triple 50/39/30 crank, and now I've got a 48/36/26 crank on it now and the derailleur has worked perfect with all three cranks. This derailleur is made by Microshift, and Nashbar actually sells it cheaper under their own brand name than their competitors do under the Microshift brand name, so it's a really great deal. This is the best price out there for a derailleur that can handle a triple crank and a 34 tooth rear sprocket, and at 231 grams that it weighs it's also lighter than anything else close to it's price range from any other manufacturer. Would I buy one again ?...YES !...as a matter of fact I plan on ordering another one. For the weight, quality, and price you can't beat it.

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          • No

          Comment on this review

           
          5.0

          Great derailleur

          By Ambrose

          from Memphis, TN

          About Me Competitive Cyclist

          Verified Buyer

          Pros

          • Durable

          Cons

            Best Uses

            • Mountain Bikes

            Comments about Nashbar Mountain Bike Rear Derailleur:

            Crisp shifts. I don't notice any difference between this one and a more expensive Shimano product. This is my second one that I've bought and am very satisfied with them. I race bikes and they perform.

            • Was this a gift?:
            • No

            Comment on this review

            (1 of 1 customers found this review helpful)

             
            4.0

            Rear Mountain Derailleur

            By Big Ring Bill

            from Novi, Michigan

            About Me Avid Cyclist

            See all my reviews

            Verified Buyer

            Pros

            • Lightweight
            • Versatile

            Cons

              Best Uses

              • Mountain Bikes

              Comments about Nashbar Mountain Bike Rear Derailleur:

              Converting a single speed to a 1 x 9. Not installed yet, but product had good appearance and workmanship is very good. Experience with order logistics was good, fast ordering and shipping.

              • Was this a gift?:
              • No

              Comment on this review

              (1 of 1 customers found this review helpful)

               
              5.0

              Great deal!!!

              By Bike shop geek

              from Tehachapi, Ca

              About Me Avid Cyclist

              Verified Buyer

              Pros

              • Durable
              • Easy to Use
              • Lightweight

              Cons

                Best Uses

                • Commuting
                • Mountain Bikes

                Comments about Nashbar Mountain Bike Rear Derailleur:

                I bought this to replace a broken XT unit. At 1/3 the price this thing is awesome! Works great, very little initial setup time. Super light weight. Looks great too!

                • Was this a gift?:
                • No

                Comment on this review

                 
                2.0

                Didn't last

                By Dr_LHA

                from State College, PA

                About Me Avid Cyclist

                Pros

                  Cons

                  • Weak

                  Best Uses

                  • Commuting

                  Comments about Nashbar Mountain Bike Rear Derailleur:

                  At first I liked this, it's large, almost gloriously chunky and industrial looking, plus it felt like it was well made/machined. For the price it seemed like a steal. Certainly set up was simple and for a few hundred miles it worked great for me. Then I started to have issues getting to the smallest cog and it turned out that the derailleur simply had lost it's springiness, it had simply lost the tension required to get there. Kudos to Nashbar, they refunded me fully. I decided I'd spend the extra bucks and go with a Shimano part instead, which have never failed me like this in the past.

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                  • No

                  Comment on this review

                   
                  4.0

                  Can"t be beat!

                  By Jim

                  from SoFla

                  About Me Competitive Cyclist

                  See all my reviews

                  Verified Buyer

                  Pros

                  • Lightweight

                  Cons

                    Best Uses

                    • Mountain Bikes

                    Comments about Nashbar Mountain Bike Rear Derailleur:

                    Replaced a 7yr old XT with this. Set up matters! Shifts so good, let us see for how long but considering the PRICE this cannot be beat.

                    • Was this a gift?:
                    • No

                    Comment on this review

                    (4 of 4 customers found this review helpful)

                     
                    4.0

                    Overall construction review

                    By Cycling for > 25 years

                    from Pennsylvania

                    About Me Avid Cyclist

                    Pros

                    • Decent Build Quality
                    • Great Price On Sale
                    • Lightweight

                    Cons

                    • No Centeron Upper Pulley

                    Best Uses

                    • Mountain Bikes
                    • Road Bikes

                    Comments about Nashbar Mountain Bike Rear Derailleur:

                    I just received it unboxed it so this is just an intial construction review of how it's built. I weighed it and it came in at 231 grams, which is the exact same weight as my older Shimano 105 model RD-5501 long cage road derailleur. I got it on sale at less than 1/3 of the current Shimano 105 long cage derailleur Nashbar is selling, so it's a great deal for the price based on weight alone. Physically the main body is larger and bulkier looking than a 105 derailleur, with wider spaced pivots on the front, looks are OK for an MTB, but would look bulkier on a road bike. As far as construction goes the main body is polished aluminum, the knuckle is plastic (like some SRAM models) with a dark grey with metallic specks finish, the inner and outer pulley plates are aluminum, and only the rear main body pivot plate is steel painted black. As far as the hardware goes the derailleur hanger bolt is aluminum for light weight, but be careful mounting it so you don't strip it or crossthread it as in another review below. I tested the rest of the hardware with a magnet, the cable mounting bolt, the "B" and "H" and "L" screws, the jockey pulley screws, and all the body pivots are all non-magnetic stainless steel so they won't rust. The "B,H,L" screws all screw directly into the aluminum body and have a keyed plastic insert on the face of the body that keeps them from unscrewing. The cable mounting bolt goes through the aluminum body and uses a regular nut to hold it, so you don't have to worry about stripping threads out of the body when tightening the cable bolt. The pulley mounting bolts are Torx bolts, instead of allen head screws, so you'll need to get a Torx bit to remove them.

                    As far as overall construction quality goes it seems pretty good, the plastic knuckle would be my only concern for MTB use. The pivots are all decently built and there's no slop in the main body from any pivot looseness. The main body spring and the pulley cage spring seem just as strong as the Shimano 105. My only gripe is with the pulleys themselves. The top pulley DOES NOT have the "Centeron" feature that Shimano uses that lets it float side-to-side, it's just a regular pulley with a bushing for a bearing, similar to the old friction shift derailleurs. Without the Centeron side-to-side float, that means your derailleur alignment will have to be spot-on, because any misalignment will cause it to make noise or mis-shift, that's why Shimano went with Centeron so things wouldn't have to be perfect. That might explain some of the poor shifting or "week spring in the middle of the cluster" comments posted below. I haven't tried to take it apart yet, so I don't know if a Centeron style pulley could replace the upper one. Set up on a rear derailleur is pretty easy and straightforward, mount it without a chain on it, set the "H" and "L" crews for the travel limits, take the slack out of the cable wih the shifter on the smallest cog and tighten the cable, then use the barrel adjustment screw to line up the derailleur in the middle of the cog range. Just by eyeballing the rear derailleur so that the upper pulley aligns with each cog when shifting through the gears without a chain on you can get it 90% correct, and any slight misalignment can be taken care of with the set screws and barrel adjuster once you put the chain on and ride the bike. I'll post another review later once I get it mounted on the bike and have some miles on it, but it looks like a decent unit, especially given the price-to-weight ratio.

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