Shimano Shadow Plus XTR Derailleur

5/5 (1 Reviews)


Product Description

A new addition to the Shimano XTR Dyna-Sys drivetrain is the RD-M985 Shadow Plus rear derailleur. It features a switch at the pulley cage to enforce a heavier spring tension and activate a friction stabilizer to counteract the forces of up and down chain momentum in rough terrain. Chain bouncing can often cause noise as the chain slaps the top and bottom of the chain stay, or even derail from the front chain ring in extreme circumstances. The switch when selected to the “ON” position dampens the cage and consequent chain movement for a nearly silent and stable riding experience. In the “Off” position it eases the installation and removal of the rear wheel by relaxing the spring tension of the cage.


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User Reviews

Overall Rating:5
Value Rating:4
Submitted by Herzalot a Weekend Warrior from Laguna Beach, CA, USA

Date Reviewed: March 15, 2012

Strengths:    Works as advertised - stops 95% of chainslap in the roughest conditions

Weaknesses:    Not sure yet - maybe a little finicky

Bottom Line:   
I've only ridden this twice, but it is an absolute game changer. It does a better job at stopping chainslap then my chain tensioner did, without the weight, drag and chain line penalty. If the durability and reliability are there, it will divide the bike world into two distinct eras - the old days when derailleurs did not stop chainslap, and the current state of the art - quiet chains that don't drop off the chainrings no matter how rough the terrain. I had read that the clutch puts a lot of resistance to shifting, but I did not notice any significant difference. I am using an XT shifter, and it feels (and works) just fine.

Let's face it, derailleurs have been pretty damn good since the invention of ramped cogs. There has been very little innovation since the early 90s - they shifted great then, and they shift great now. This is different. It adds a function that we all want - a quiet chain. For carbon frame owners, it's a must. I am sure SRAM will be introducing something similar (if not, it's buh bye SRAM).

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Favorite Trail:   Aliso, Whistler

Duration Product Used:   Less than 1 month

Price Paid:    $200.00

Purchased At:   Pro Bike Supply

Similar Products Used:   XT Shadow, Saint Shadow

Bike Setup:   '09 Yeti 575, Marzocchi 55 micro Switch TA, DT Swiss EX 1750

Reviews 1 - 1 (1 Reviews Total)

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