An LRP or DRS (chainguides for dual chainring setup) won't stop it. Are you talking about the noise when you go over bumpy terrain, or is it rubbing when you pedal?:?:
Not slap on the stay. It is all bundled up with some lizard skin action. It is the cage of the front der. I can simulate the noise on the stand my moving the chain up and down in the cage. It does it over bumpy terrain when the chain flops around.
Two things. First see if your chain is to long. You want just enough chain slack to be able to shift into the largest front and rear chain rings. You won't usually use this gearing combination but any excess chain slack will cause clanking. Remove enough links until the rear derailure still has some give. Second on down hills try shifting into at least the front middle chain ring or larger. This will also take up some chain slack and increase chain tension with out having to adjust the chain length.
I barely have enough to shift large/large. Also, I'm always in the middle ring. When I go to the big ring, the chain is far enough from the bottom of the cage and enough tension is taken up where it doesn't clank. But in the middle, it clanks.
Your probably gonna need a new frame... It has something to do with the allignment of the seat tube and the BB position I vote 1X9
What frame do you have and what gear combo does this occur in? Are you running a short, medium or long cage rear derailleur? You should never be in big/big combo (in a 3x9) so no need to run enough chain for this. Testing on the stand is not a true indicator here if it is a fs frame. With fs frames, you are not taking into account the affects of sag on the chain setup. As a general rule, chain length should be just enough to wrap around the big chainring and the biggest rear cog WITHOUT running it through any derailleurs + 2 links. This is how length should be calculated. Some FS frames (usually single pivots) have extreme chain growth (increase in distance between the bottom bracket and the rear axle) when cycled through it's travel so you will need a longer chain, but this is not the norm. I would also check to makes sure it's not chain slap on the seat stay or the rear derailleur itself hitting the chain stay. In rough high speed downhills my bikes also make quite a bit of noise. This cannot be eliminated with fs frames and geared bikes, only reduced. Duc
Dump the big ring, put on a bash and shorten the chain. Then just keep pedaling so the chain doesn't go slack. Dean
Adjust your front derailleur clmap. It may be on the wrong. Lisent to Panto. You should not use big/ big combo.
It does sound like your chain has too much slack. Normally on downhills I like to shift into the big ring so the rear derailleur tensions the chain. I never run a chain guide and I never drop chains. Since the 3rd cog is the lowest I'll go in the big ring, I shorten my chains so the rear derailleur cage is about 45 degrees forward when in that position. Another possibility is adjusting your front derailleur on the seat tube. It might be a hair too high or low. Also try adjusting the high and low microadjust screws.
1. Check your freehub to make sure it's not tight. You shouldn't notice any slack chain when freewheeling. 2. Tighten up that B-tension screw on the rear derailleur. 3. Rear derailleur cage spring has loosened up over the years. 4. Keep pedaling to keep the chain tension up! 5. If all else fails, you need one of these: (It's purple anno bling too!) http://cgi.ebay.com/BULLET-BROS-CHA...ryZ42329QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I measured my chain by going large/large without going through the der. It is on a Giant Reign frame. This also happens on all my other bikes. What the heck is that chain tension thing? What does it do?
It just pulls the bottom derailleur pulley up behind the dropout using a spring hung off the cantilevered aluminum piece. Reviews here: http://www.mtbr.com/reviews/Chain_Accessories/product_20657.shtml
Always done this, even with an entire new drivetrain. Just wondering if I'm doing something wrong or if I'm just being too anal about the noise. Or is there actually somethign that will solve this problem.
There are some frames more prone to chain rubbing the FD cage in the middle ring/high gears. My 5 Spot does this a little but nothing I can't live with. Try playing with the FD height and angle. Just be sure to cycle the suspension to make sure the back of the cage doesn't hit the CS or yoke on full compression. If you're running a Shimano derailleur I've heard the SRAM's have a shorter cage eliminating the problem. Maybe try that if you can't live with it.
