bikernew

First off(so as not to get scolded) I tried searching and admittedly not I'm too adept at refining search results yet. (Also ADD/OCD/Mad! and plain short on patience)
Did a quick Google also but only saw front trim info... SO, quite simply: is there trim adjust for RD, and if so what does it do/when and how to use ?
Additionally, I noticed my FD trim adjust works great when moving from low 5 gears to high, but only on my small ring. No effect, and/or doesn't even seem to be needed, on large ring after my recent tune, which I myself got spot-on. Is this normal or does the FD trim have some useful purpose when riding on the large ring??? Thanks in advance!!!

corrado33

There is no rear trim function on any rear shifter. (Not including electronic shifting.)

There is a trim function on the big ring but you're high limit is probably screwed in too far to take advantage of it (or when you shift to the big ring you're already shifting to the "trimmed" position. I suspect that your big ring is closer to the center of your cassette, therefore negating the need to trim it.

ckindt

There is no trim on the 5800 rear derailleur.
My front trim works similar to your experiences.
Using the trim on the big ring allows me to cross chain without rub.

WalksOn2Wheels

The only rear shifting mech with a trim function is going to be down tube friction shifters. (Ok, I guess they could be mounted on the bar end, too).

Front shifting often has trim positions, but it's really easy to set up a front derailleur to shift from big to small and back down again while completely failing to tune it for the trim positions. For the large ring, the trim position is used for when you are in the largest 3 or 4 cogs on the cassette as the chain will sometimes rubs on the inside plate of the FD. Sometimes bikes work out and you can get no rub in the big/small combo and virtually no rub on the big/big combo where the trim would be needed (but this is generally a bad idea for other reasons, known as cross chaining).

If the rear cassette is making noise and you think the chain is not lined up properly, then the rear derailleur needs to be tuned and/or the derailleur hanger needs to be straightened. A properly tuned index shifting bike should not need trim on the rear.

bikernew

Thanks for confirming... Does bring me to another question(observation). Is it NORMAL to have a good deal of chain "chatter(clatter)" in the lowest(yes, largest) 3 or even 4 gears of a 10 speed cassette when riding on the large chain ring? I've got my limits and indexing set perfectly, after several attempts and including a complete RD cable cleaning and lube.

dr_lha

Depends on your chainline, but on my 10-speed 105 bike, I don't get a huge amount of chatter. You might want to make sure your front derailleur is correctly aligned (as in, rotate it around the frame).

corrado33

Normal? Probably. Most people don't adjust their derailleurs correctly. Normal on a properly set up bike? No. Noise on 2-3 cogs, sure, that's possible, but 4, no... too much. Let your cable tension out on the front derailleur a bit and use the trim function in the big ring.

bikernew

I should prolly just shoot a short video... I have the FD adjusted just fine. The 'clatter' I speak of is merely chain line, free of rub on any cassette gear or the FD itself. I have zero CHAIN/CAGE rub on my FD except for dropping into my high gears which is when I use the FD trim

datlas 

No. If you have your drivetrain set up properly you should really be able to use all gear combinations without any rub/clatter. You may need to use the trim on the big ring on the largest few gears when on the big ring. I think you may need to adjust your limit screw.

bikernew

Think I may need to clarify this question.

When I speak of chain chatter/clatter I am merely referring to drive line; just general running of the chain ober y crank and cassette. I have no FD chainrub whatsoever, and my FD's low and high limits are both set snug as a bug, prolly .5to 1 mm

milkbaby

You should be able to trim the FD to eliminate the chain rubbing on the FD cage. Some frames with short chainstays will be more likely to have rubbing due to the more severe angle of the chain. Also, sometimes if the FD cable tension is too high, the trim function won't work properly.

Athens80

Another possibility is that your rear derailleur hanger is slightly bent. A bent hanger could result in the derailleur being properly aligned with the smaller cogs but out of alignment with the larger cogs on the cassette.

Your shop can check the hanger alignment for you if you don't have access to the tool yourself.

dr_lha

OK. I second checking derailleur hanger alignment. Out of interest does the bike has disc brakes?

bikernew

Thanks. It had been suggested in a former thread I started when I was tuning the bike. I figured being she had less than 150 miles(literally), and the RD hanger 'looked' OK, all was good but guess it's worth a check. Honestly, as mentioned in my OP, I'm a tad bit OCD. Maybe just to satisfy my curiosity I'll ride it over to the shop and see what they say. I am incredibly oversensitive, both to smells and noises!!

ThermionicScott 

Some extra noise is normal in the cross-chained positions. When the chainline is straight, most of the contact is between the chain rollers and chainring teeth. But when run at an extreme angle, the chain's side-plates start contacting the chainring teeth and must then ride down the teeth before the chain can settle into place.

Homebrew01

This. But "3rd" and "4th" should be quiet.

bikernew

Thanks guys... just FYI, again I am hyper-sensitive to noises, so the 'clatter' I speak of may actually be normal. Think I will just test drive a couple new bikes next time at the LBS and see if they exhibit the same. I had seen in another thread that maybe the chain, say KMC over Shimano, could make a difference?? Just a thought.

Homebrew01

A drive train can't be truly silent. You have metal on metal, and a lot of moving parts.
Proper adjustment and lubrication will minimize it.

Gege-Bubu

The RD alignment should be checked first. It has to be done at the shop if you do not have the special tool.
They all look "normal" but even brand new hangers need to be aligned.

I had similar problem you are described and no adjustment helped. Then I bought the tool and it has shown that my hanger is bent. Fixed it in a minute, and all my problems gone.