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R8000 front der / 11s cassette

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R8000 front der / 11s cassette

Old 05-21-23, 09:54 PM
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bunsen
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R8000 front der / 11s cassette

Is a r8000 front mech derr's cage wide enough to cover the whole range of 11 gears? If the chain touches when shifting on the upper (bigger) cassette speeds, how can I adjust the front derr do have clearance, (I am aware that I'd be sacrificing gears when in the small chain ring.. But if I want keep the derr mainly in the large chain ring....
Please help. Thanks in advance.
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Old 05-22-23, 05:38 AM
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shelbyfv
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In theory, the big ring trim position should allow you to use the entire cassette. Follow the instructions precisely and in order. Shimano

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Old 05-22-23, 05:45 AM
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alcjphil
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Shimano 11 speed setups have a trim position for the front derailleur to address that situation for both large and small rings. It is still desirable to not cross chain any more often than necessary
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Old 05-22-23, 06:11 AM
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rm -rf
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I'm guessing the Shimano warning is mostly for the big chainring interference.
The Dealer Manual linked in the comment above is very good. All the steps are clearly explained, even for an amateur mechanic like me.

My Di2 trims the front derailleur automatically.,so there's no derailleur cage rubbing. (and the newer Di2 versions don't even allow the small-small cross chain.)

When cross chaining the small front and smallest two cogs, the chain hits the shifting assist pins on the side of the big chainring. Tick, tick, tick... It still rides okay, it's just an annoying noise.

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Old 05-23-23, 12:57 AM
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Originally Posted by rm -rf
When cross chaining the small front and smallest two cogs, the chain hits the shifting assist pins on the side of the big chainring. Tick, tick, tick... It still rides okay, it's just an annoying noise.
The diagram from the Shimano dealer manual shown above in post #2 indicates that there may be chain rub and noise when riding on the small chainring with the 4 smallest cogs. The exact number of cogs affected depends on the chain line and the length of the chain stays.
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Old 05-23-23, 08:41 AM
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With some bikes having shorter chain stays and other bikes just not having the perfect chain line between the front and the back, you might just have to put up with some rub when in the big/big or small/small. However you really shouldn't be in those gears long. And there is very likely a ratio that's very close to that combo in the other chain ring if you have to have that ratio or number of gear inches for an extended period.

Trim goes a long way to solving the issue. Make sure you understand how and when to use it and when to remove the trim as you shift through the gears. It also needs to be checked when you do your initial adjustments on the FDR as it might not be working correctly if you don't pay attention to it.
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