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Discussion Starter · #1 ·
RD-M810-GS

Wanted to get some other users opinions here....

Since I've had the SAINT rear der. on my Demo 7 it's got this knocking that is buggin me.
At first I thought I was bottoming out, but realized that it's coming from the rear der. hitting the rear chainstay...at least I'm pretty sure it is. Looks to be the top pully area hitting right where the FSR rear linkage is (tough spot to insulate with something)

I've only heard this clunk since I've installed the der. so I'm deducing that it's gotta be that.
Aside from installing some extra padding at the impact point on my chainstay, do you have any other solutions or experiances?
Everything shifts and moves clean.
Thanks for the help...
 

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yeah, those can do that. put your der. in the smallest gear, and pull the shock (if it's not that much trouble). compress the suspension all the way, and adjust the B-tension screw (the big long one on the back) in until it doesn't hit anymore.

it's the price you pay for a derailleur that doesn't stick out at all
 

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If the Saint Shadow is hitting your stay, would it not suggest that your chain is too long? The single pivot of the Shadow design should prevent the body contacting the frame unless there's insufficient chain tension to hold it far enough away when you're in higher gears.
 

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I've read in some online reviews that the Saint derailleurs still do swing up and hit the chainstays, like most Shimano derailleurs, even if they claim that they've designed it not to. I love the feel of Shimano derailleurs, but that movement and clunking on the chainstays made me move to SRAM.
 

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Discussion Starter · #7 ·
juan, that link is not working for me. But it sounds like exactly what is happening...
I'm curious to read on...
 

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http://www.nsmb.com/2528-saint-reborn-part-ii
The catch? Shadow was supposed to solve the cage against chainstay clatter that has plagued Shimano derailleurs for as long as I can remember. The Shadow models cannot make contact with your stay because they have a hard stop well below that mark. After having used the XTR model I can attest to its silky silent operation. As I got up to speed in the park I began to hear a disconcerting clatter. At first I thought something was loose or even broken - it was that loud and annoying. Further inspection revealed that the Saint rear mech was actually banging loudly against its own stopper...
 

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UNDEAD
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Discussion Starter · #9 ·
Wow...I was thinking maybe it's hitting itself someplace but then thought...noooo
SAINT can't be like that, it's gotta be something else.
Interesting :skep:
Thanks for the article!

well...guess it's something I'm gunna have to get use to. Kinda bummed, cause it's pretty darn annoying.
 

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snow-man,

If I understand this correctly,I think I can help you. All the Spec Bike's come
with a rubber bumper that sit's on top of the Der. Body to keep thing's nice
and quite. Let me take a shot for you. This is my bike that I just put it on
for you.

On the underside is an adhesive,as you can see,there is a groove For the zip tie.
Would this help you? If so,PM your Address and I send one out ASAP. Peace.

MTK
 

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"If I understand this correctly...

You've misunderstood. The Saint Shadow can't contact the frame, even with Spec's lowered pivots - unless the B-screw is misplaced and the chain tension is too loose. The Shadow design (Saint, XT, SLX), unlike the previous Shimano derailleurs, has a restricted range of vertical motion. The body pivots allow lateral movement across the cassette, but the main pivot, pointed out on the picture below, is no longer sprung and is restricted by the position of the B-screw against the derailleur stop. The result of this is that it's physically impossible for the derailleur body to bounce up and hit the frame. Even with the B-screw backed all the way out and no chain fitted, it's not possible for the derailleur to contact the frame on the FSR pictured.

Bicycle part Bicycle drivetrain part Groupset Bicycle chain Crankset


The problem of noise described in the article that juanbeegas linked is related to the main pivot. Although the range of motion is limited, the fact that the derailleur is now effectively free to move - there's no spring to absorb movement - means that the B-screw can now tap on the stop. Having a chain which is too long will exaggerate this issue, as will having the B-screw set too far out. I suppose that it could be considered a design fault, but proper installation will reduce the extent to which it is experienced. In my experience, as with the rider in the NSMB article, it may only become apparent at very high speed with sharp, successive knocks.
 

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Discussion Starter · #12 ·
Good to know guys, thanks for the help.

I will have my wrench look at my chain, take any slack out that is needed and also pay some attention to that tension screw to keep things quite (if possible)

Well at least people will know I'm coming down the trail :eek:
 
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