NCMTBIKER

Im sure this has been asked before but..i was riding today,i have a triple on my trek 1000 i was in the middle cog up front and my biggest cog on the cassate.I kept hearing the chain rubbing the front derailer.What do i need to adjust to stop this??Thanks

Luke52

Nothing, that's normal when you're at the outermost or innermost sprocket on the cassette, and in the middle ring.

If it's not rubbing anywhere else, leave it. If it was rubbing in a middle-middle combination, THEN you'd want to adjust it.

NCMTBIKER

i dint think the chain was suppose to hit against anything while u were riding

cyccommute 

If you are using STI, there's a trim stop...kind of a soft click...on the shifter that should move the derailer over without it shifting. If your cable is stretched a little, this trim stop may not move far enough to stop rubbing.

The middle ring and the largest cog are going to be close on the derailer no matter how the bike is set up. A little rubbing may be the best you can get. Check the cable tension however.

JiveTurkey

For clarification: chainring refers to the front sprockets, cogs to the back.

I can easily use all 10 cogs in back while in my middle chainring. It should be set up so that the FD is as faraway from the seat tube as possible before it rubs while in middle chainring/big cog. Then, you may need to use the half-click trim feature to use the smallest one or two cogs.

If it is rubbing in middle/big, then you need LESS cable tension. Try turning a barrel adjuster clockwise (from the top) a little. If it is screwed in all the way, then you'll need to re-attach the cable with a little more slack.(All the cable tension will need to be released first; shift the front shifeter as if you were trying to get it into the small chainring.)

Edit: make sure you don't have the front shifter in the trim position while trying to use the largest cog. If you had activated the trim and left it there, then there will be too much tension in the cable and will cause the chain to rub when trying to use the largest cog.

Not sure if your Trek 1000 came with a front shifter that has trim though. If you don't have trim, you may be able to adjust the FD in a way that lets you ride rub-free while in all cogs. If you can't then I'd suggest having it rub in the smallest cog; it'll give you a signal that it's time to switch to the outer chainring.

NCMTBIKER

mine is a 2007 model so not sure about the trim u speak of..

SteelCan

Nonsense on the chain rub ESPECIALLY when in the middle of a triple chainring. Only time ever is when totally cross-chained BigBig or Little Little (which you should never be in anyway)

Al1943

Shimano road triple shifters have two positions to use when on the middle chainring. One position should be slightly left of center, the other slightly right on center. When the chain is on the extreme left side or extreme right side of the cassette choose the corresponding shifter/front derailleur position to avoid chain rub. You should be able to access all of the cassette cogs from the middle chainring without chain rub if you select the correct position.

Doug64

Some of the Sora shifters don't have "trim"-It depends on the year. A triple can usually be adjusted so there is no rub in any gear combination However, if you are going to get front derailleur rub it is likely to occur in the big chainring/small rear sprocket or the smallest chainring/largest sprocket conbinations. When on the middle chainring the chain should not rub. We have 6 bikes with triple setups in our family. None rub in the middle and a couple don't rub in any combination.