Quick question

Quoted post said:

Originally posted by Rythym
Hey guys i took my trek 1500 on its first ride today and had a quick question since im pretty new to this stuff. When i am on the smallist cog on the front and any gear 7 through 9 grindes on the front derailer. is that normal? Because i dont think so and i just wanted to ask to make sure. Thanks

Alex

No matter what - it shouldn't grind - so take it back. Normally around 500 miles everything is streched out & it should be taken back for tweaking - but in your case do it now.
Side point - if you are talking about the smallest gears on the back as being 7 - 9 you should be in the big gear on the front to use those for the most part & vice versa - big gear in front don't use the big gears in the back - it streches your chain, etc... Hope this helps.

yea the chain is crossed. its on the small cog on the frontand the small cog on the back. so maybe its my fault then. nothing else grindes. let me know if im wrong thanks.

Alex

Howdy.

If by 7 through 9, you mean the outermost three cogs, that's perfectly normal. Even the finest-tuned, highest-end drivetrain generally won't allow you to run the chain in that range without clatter; the reverse is usually true as well (when in the big ring up front, you shouldn't be running the innermost couple of cogs).

As a general shifting strategy for starters, aim to use the small ring with the inner half of the cogset, and the big ring with the outer half of the cogset. You can bend those rules as your riding demands, but there's never any reason to be running the chain in the most extreme positions (from the small ring to the outermost cog, and vice versa).

Take care

Quoted post said:

Originally posted by lokstah
Howdy.

If by 7 through 9, you mean the outermost three cogs, that's perfectly normal. Even the finest-tuned, highest-end drivetrain generally won't allow you to run the chain in that range without clatter; the reverse is usually true as well (when in the big ring up front, you shouldn't be running the innermost couple of cogs).

As a general shifting strategy for starters, aim to use the small ring with the inner half of the cogset, and the big ring with the outer half of the cogset. You can bend those rules as your riding demands, but there's never any reason to be running the chain in the most extreme positions (from the small ring to the outermost cog, and vice versa).

Take care

Thanks that answers my question 🙂

Quoted post said:

Originally posted by Rythym
Hey guys i took my trek 1500 on its first ride today and had a quick question since im pretty new to this stuff. When i am on the smallist cog on the front and any gear 7 through 9 grindes on the front derailer. is that normal? Because i dont think so and i just wanted to ask to make sure. Thanks

Alex

The front shiffter has trim positions in it. Read the owners manual and lean how to use it properly. Even with trim you shouldn't be in the smal/small or big/big. It's possible to also get chain rub on the big ring when in the small ring and small cogs.Trim won't cure that.

Quoted post said:

Originally posted by lokstah
Howdy.

If by 7 through 9, you mean the outermost three cogs, that's perfectly normal. Even the finest-tuned, highest-end drivetrain generally won't allow you to run the chain in that range without clatter;

hooey! Ever heard of trim in the front shifter?

Quoted post said:

Originally posted by SLS
No matter what - it shouldn't grind - so take it back. Normally around 500 miles everything is streched out & it should be taken back for tweaking - but in your case do it now.

Hooey! ever heard of trimming the FD with the shifter?

i dont know what you guys are talking about now. please explain.
Thanks

Alex

Quoted post said:

Originally posted by boudreaux
hooey! Ever heard of trim in the front shifter?

Of course I have. Cut me a little slack here.

I said generally speaking; trim positions are a bit of a nuance in the context of this thread. Step two, ya know?

See, look. You've got him confused, when in the end, the lesson the guy needed to be taught was pretty simple: NO, his drivertrain wasn't behaving abnormally, and YES, he should avoid extreme cog/ring configurations.

Feel free to explain the whole trim concept -- it's not that hard, and it's a useful concept -- but it's a step beyond what Rhythym was asking about. Definitely the holster the hooey pistol for two seconds there.

Quoted post said:

Originally posted by Rythym
i dont know what you guys are talking about now. please explain.
Thanks

Alex

Assuming a new bike,didn't it come with an instruction manual,and didn't the shop show you how the shifters worked?

looked in the manuel and did not find anything on trim with the shifters.

Alex

Quoted post said:

Originally posted by Rythym
looked in the manuel and did not find anything on trim with the shifters.

Alex

That's lame, and the shop was even lamer. Check the thread on STI question toward the end for trim exp.

Quoted post said:

Originally posted by lokstah
Of course I have. Cut me a little slack here.

I said generally speaking; trim positions are a bit of a nuance in the context of this thread. Step two, ya know?

See, look. You've got him confused, when in the end, the lesson the guy needed to be taught was pretty simple: NO, his drivertrain wasn't behaving abnormally, and YES, he should avoid extreme cog/ring configurations.

Feel free to explain the whole trim concept -- it's not that hard, and it's a useful concept -- but it's a step beyond what Rhythym was asking about. Definitely the holster the hooey pistol for two seconds there.

With a properly tuned setup as you said, AND using the trim in the shifter the chain won't rub the derailer even in the smal/small. Trim is not simply a nuance. it's there for a reason, and all the more reason for it with narrower derailer cages. There are setups that may not even require trim depending on a number of variables. Certainly he should not be in the small/small,but I read it as rub in a number of small cogs,which is where trim comes in. Also,depending on a number of variables, there can be chain rub on the big ring in several of the smaller cogs. No cure for that other than sometimes a thinner chain or BB spacer.

so the problem im having is not normal? because the chain is crossed like you said before. Thanks

Alex

Boudreaux, I know trim positions are important.

Rhythym, though, is trying to figure out whether his drivetrain is defective or in need of repair, on the basis of his getting chainrub in the outer 3 cogs while in the inner ring.

The answer is almost certainly NO, his drivetrain is behaving perfectly normally. The statement of mine which you won't let up on ("Even the finest-tuned, highest-end drivetrain generally won't allow you to run the chain in that range without clatter") wasn't an expression of procedure; sure, the solution to running those gears smoothly is utilizing a trim position.

I was simply reassuring the guy that his noisy drivetrain was behaving predictably. Why the fight?

Quoted post said:

Originally posted by lokstah
Boudreaux, I know trim positions are important.

Rhythym, though, is trying to figure out whether his drivetrain is defective or in need of repair, on the basis of his getting chainrub in the outer 3 cogs while in the inner ring.

The answer is almost certainly NO, his drivetrain is behaving perfectly normally. The statement of mine which you won't let up on ("Even the finest-tuned, highest-end drivetrain generally won't allow you to run the chain in that range without clatter") wasn't an expression of procedure; sure, the solution to running those gears smoothly is utilizing a trim position.

I was simply reassuring the guy that his noisy drivetrain was behaving predictably. Why the fight?

If he can't trim it out, then there may be something that needs attention.And, yeah,he could be getting derailer rub on a perfectly tuned setup with out using the trim.If the trim then cures it,everything is hunkey dory...No?

Quoted post said:

Originally posted by boudreaux
If the trim then cures it,everything is hunkey dory...No?

Like Bowie and Jagger.

my bike grinded when i was on the big gear on my triple in the front and the smallest gear in the back. i took it to my bike shop i purchased it from and i wasnt even in there 5 minutes b4 they fixed it for me. tightend something up and adjusted something that wasnt tighted down as much as it should have been that got knocked out of place by just a hair from putting it in the car. now its all good. 🙂 trek 2100 rides oh so nice.

Quoted post said:

Originally posted by HyperPhreak
my bike grinded when i was on the big gear on my triple in the front and the smallest gear in the back. i took it to my bike shop i purchased it from and i wasnt even in there 5 minutes b4 they fixed it for me. tightend something up and adjusted something that wasnt tighted down as much as it should have been that got knocked out of place by just a hair from putting it in the car. now its all good. 🙂 trek 2100 rides oh so nice.

Thanks. yeah i love my 1500