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Thread: replace your middle chainring.... often

  1. #1
    Mojo Philomath Dave K's Avatar
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    Lightbulb replace your middle chainring.... often

    I am an idiot. I've been complaining about my chain dropping during most every rocky, bumpy race I've entered. I knew my middle chainring was worn, and even missing one tooth, but didn't think that could be the problem. I ordered one, and have had it for a while, but never took the time to put it on.

    Well, the night before the Kelly Creek race, I finally decided I better put it on. Kind of a no-no to make last minute adjustments, but I was looking at it, and it just started bothering me.

    Well, whatdya know. 2 laps of the sport course at Kelly Creek, on some of the roughest, rockiest stuff I've ever gone down. Stuff that I normally would've dropped my chain a bunch of times. But not once did I ever drop my chain.

    I had to jack with the barrel-adjuster for the rear derailleur a bit to smooth things out back there, but once I got it dialed in, the 2nd lap went real smooth.

    One thing that might have helped a bit too, was I put the inner-stop setting screw on the front derailleur in a little closer towards the middle gear. In fact, it was so close I tried going for the granny gear on Boone's Hill and couldn't get to it. I was probably turning the pedals too slow to shift anyway. Which was fine actually, cuz I really shouldn't have been trying to use it. A habit I've been trying to break.

    The reason I tightened the stop-screw on the FD is that I realized on rocky courses like that or where I have to dismount sometimes, I sometimes bump the Front Derailleur downshift button. And if the pedals turn cuz of obstacles (which there always are) then my chain drops onto the bottom bracket. I was watching for this during the KC race, and sure enough, I bumped the button several times not only while dismounted, but also riding down extremely rocky passages and downhills. Well, with the new chainring on there and tightened adjustment screw, the chain never left the middle chainring. Being wary of the problem too, I watched the shift indicator on the Fr. Der. and made sure I shifted it back to the middle chainring before pedalling if it wasn't in the right position. Hmm... this makes me think I should get a grip-shift or maybe the new XTR brake-lever shifter for my Front Derailleur?
    "The policy of the American government is to leave its citizens free, neither restraining them nor aiding them in their pursuits. ..." Thomas Jefferson

  2. #2
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    carlos's Avatar
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    had that ring been on since the Comfort ride to see Moe off?

    all last minute adjustments are fine to do. as long as you don't change something that /drastically/ alters the ride. that's the key, drastically.

    the mod you did on the front der is cool since it'll keep you from resorting to the smallest ring anytime the trail turns up.

    i did that just before going 2X9. is 2X9 in your future?

    the comment about Grip Shift is so true. if i know it'll be rocky i'll just click the shifter back and trim the adjustment so that the chain just lightly rubs on the front der cage.

    so do you like climbing the middle ring better?

    do you find you climb slower or faster?

    do you find you get tired faster?

    when will you weigh something else?

    did you compare the weight of your head to your girlfriends?

  3. #3
    Mojo Philomath Dave K's Avatar
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    Originally posted by carlos
    had that ring been on since the Comfort ride to see Moe off?

    all last minute adjustments are fine to do. as long as you don't change something that /drastically/ alters the ride. that's the key, drastically.

    the mod you did on the front der is cool since it'll keep you from resorting to the smallest ring anytime the trail turns up.

    i did that just before going 2X9. is 2X9 in your future?

    the comment about Grip Shift is so true. if i know it'll be rocky i'll just click the shifter back and trim the adjustment so that the chain just lightly rubs on the front der cage.

    so do you like climbing the middle ring better?

    do you find you climb slower or faster?

    do you find you get tired faster?

    when will you weigh something else?

    did you compare the weight of your head to your girlfriends?
    Thanks Carlos!

    I'll answer this on this other thread.
    "The policy of the American government is to leave its citizens free, neither restraining them nor aiding them in their pursuits. ..." Thomas Jefferson

  4. #4
    try explaining the internet to a bum!
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    carlos's Avatar
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    go tit!

  5. #5
    try explaining the internet to a bum!
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    i meant to type...got it.

  6. #6
    F**K the establishment flbikerman's Avatar
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    Originally posted by carlos
    go tit!
    A Freudian slip ?
    Outer space is just 62 miles away.

    "There are circumstances in life that cause us to become strangers even to ourselves."

  7. #7
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    carlos's Avatar
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    sure, why not.

  8. #8
    MoJo Bishop Smitty's Avatar
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    Speaking of replacing chain-rings . . .

    I was out at Comfort this weekend and noticed that not only is the middle ring slightly worn, but the small one is bent, causing the chain to fall off at inopportune moments (like there is a good time for it to fall off, but I digress).

    Anyway, back to the point, what are good replacement chain-rings and where is the best place to get them? I don't really want to replace cranks as there is no need to, but do need some new rings. I have the four bolt pattern cranks (Bontrager Race). Thanks.
    Some are wise. Some are otherwise.

  9. #9
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    carlos's Avatar
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    smitty, as long as the rings aren't Vuelta or Sugino, you're ok.

    cost may come up and here's why.

    very few aftermarket companies make a chainring for 4 arm. be it shimano or not.

    so the chance that a shop might have a 4 arm ring (that's of better quality) in stock is slim. they will probably have to order it.

    if you decide to replace all three rings, chain, and cassette (if the drivetrain is more than a year old, make sure to have the the chain checked for wear....you don't want to spend cash on new rings and have a worn chain wear them down), you may want to think about new cranks.

    a new set of rings (ringle, real, race face) might come in at $70-90 bucks. a new crankset could be had for about that much.

    either way, make sure to get the chain checked for wear and then decide whether to change the chain alone or get a crisp new drivetrain.

  10. #10
    MoJo Bishop Smitty's Avatar
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    Thanks Carlos -

    You are, as always, a vast source of information and help.
    Some are wise. Some are otherwise.

  11. #11
    try explaining the internet to a bum!
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    carlos's Avatar
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    no prob.

    also, one last thing, the 9 speed milage range is about 1000 so if you have a computer check that to see if it might already be time for a new drivetrain.

  12. #12
    Homesick for Texas Weeg's Avatar
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    I'm sitting here beside myself...
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