SRAM Red read derailleur shifting adjustment

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iamuwere
Posts: 2
Joined: Tue Aug 19, 2014 4:08 am
Location: Cleveland, Ohio
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by iamuwere

12mn is not 0.005". Sorry. That is nearly 0.5"


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ictus
Posts: 13
Joined: Fri Sep 05, 2014 8:29 pm

by ictus

yea, 12mm or roughly half an inch. I agree it is not a precision tool but it works fine to get in the ballpark which the instruction manual states is no measurement is more than 4mm from another around the wheel.

rijndael
Posts: 402
Joined: Tue Sep 20, 2011 12:54 pm
Location: Haines, AK - Temporarily

by rijndael

iamuwere wrote:12mn is not 0.005". Sorry.


I didn't equate 12mm to ~.005". You said: "12mm or 0.12mm?"

.12mm, the second number you listed, is about .005".

drewb
Posts: 96
Joined: Tue Aug 24, 2010 11:53 pm

by drewb

I don't want to hijack this thread, but I too have a problem with my SRAM Red derailleur.

I can adjust it so that it works flawlessly in the big chainring....but then I will have trouble in the small ring (going from about 7 sprocket to 8, it will not go up.)

I then adjust the tensioner so that the derailleur will move in the small ring (working flawlessly) and then it won't go from the 12 to the 11 tooth (too much tension.)

These are the steps I have tried so far:

    New cables (two times - latest are shimano, earlier replacement was jagwire.)
    new liners - rear loop and then attached to the shifter. (shimano)
    New derailleur hanger
    I tried my GF's force derailleur on my bike and had the same problem. Her bike shifts flawlessly. Trek 5 series.
    I lubed my Red derailleur.
    My front shifting is excellent
    I swapping rear wheels.
    I tried a new cassette.
    BB barings are sram and installed properly with all washers and parts.

Bike:
Trek Madone 2014 7 series.

My Red jockey wheels have a little bit more play than her Force wheels - maybe 1mm at the rim.

This is driving me nuts - I cannot think of what it could be. Can anyone help?

:mrgreen: :up: :noidea: :noidea: :noidea:

Many thanks,

Drew

DuncanS
Posts: 143
Joined: Thu Aug 12, 2010 4:42 pm

by DuncanS

Goto first reply: check hanger alignment with a proper tool.

drewb
Posts: 96
Joined: Tue Aug 24, 2010 11:53 pm

by drewb

My problem is no longer and I am posting for reference.

Recap: rear derailleur was impossible to tune - if I got it right in the big ring, it was bad in the small. and visa versa.

Culprit: rear cable housing loop was too short (by about 4.5cm).

Solution: replace the rear housing with LONG loop (so that the final 3cm of the cable runs "straight" into the the derailleur. Now it shifts easily, without effort and changes gear faultlessly. No more wishing for di2.

mattr
Posts: 4671
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

12mm over the radius of the wheel is more like it. And I've seen new frames with more than that.

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