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Rear Derauiller Adjustment Problem

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Rear Derauiller Adjustment Problem

Old 07-05-11, 07:19 AM
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Wayne Meuir
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Rear Derauiller Adjustment Problem

I have an Ultegra 9-speed rear derauiller that I cannot figure out how to adjust properly. I set the high and low limit screws according to Park Tools Big Blue Book instructions and both those adjustments seems to work fine.
However, when I try to set the indexing adjustment on the shifter cables, I can get the derauiller to shift perfectly through the first 8 gears. No noise and smoothe shifts that are not sluggish. Everything seems to work virtually perfectly except it will not shift into high gear cog on the rear. If I turn the barrel adjuster IN about 1 round, it will shift into 9th gear just fine, but then the chain rubs the the adjoining gear and trys to jump off the cog in all 8 of the other gears.
I put a brand new SRAM 9-speed chain and an brand new SRAM 11-23 cassette on the bike because the Dura Ace cassette was worn, but its doing the same thing with the new parts.
I rode the bike 40 miles yesterday and everything seems to work smoothly and shifts perfectly, except it will not go onto the 11 tooth cog.
I'm new at this, so I obviously am missing something.
Suggestions?

Wayne
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Old 07-05-11, 09:04 AM
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It's possible that there's some friction within the housing and the RD spring is unable to pull the last of the cable down. Reset the trim for best shifting on all but high gear (this is the correct trim). Shift to the 2nd (2nd high) then shift to high.

If it hangs up, pluck the bare wire away from the downtube like a guitar string. If that completes the shift it confirms my theory. You can try backing off the high limit a hair, but the answer is to run some light lube into the housing, and work the cable until it runs freely.
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Old 07-05-11, 09:16 AM
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mechBgon
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Also inspect the shift cable at the shifter end, to see if the cable has any broken strands at the head.
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Old 07-05-11, 12:04 PM
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Wayne Meuir
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Thanks, guys, I will check the cable housing. It seemed to me to be OK, but there it may need some lube. I my just go ahead and replace the cable since I do not know how old it is. I repalced the FD cable becasue it was frayed and the front is shifting fine now.
If I screw the barrell adjuster in about a round or so, the shift to the 11T works smoothly and the chain runs on that cog OK, but then when I shift to any of the subsequet lower gears, the chain rubs the adjoining cog and rattles like heck.

Wayne
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