New to the site, looking for some MTB advice/
02-09-13, 06:49 PM
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New to the site, looking for some MTB advice/
Hey my name is Kevin, I ride a Trek 7000 and and a Trek 4300. I just bought the 4300 and it had a skip in it while pedaling hard on the cranks. I changed the crank arms, chain rings, and rear cassette. Had the front, rear derailleur adjusted, and chain checked for wear. The chain checked good and was within specification. With having new front chain rings, rear cassette, and chain within specs I am lost and the problem still persists under hard crank. It seems like the chain skips. I am not certain how old the chain actually is but only that it is within factory specs. Any suggestions on what I should replace next??
02-09-13, 06:54 PM
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Welcome aboard 
This question would would be right at home in the Bicycle Mechanics forum. Give me just a second and I'll move the thread there...
This question would would be right at home in the Bicycle Mechanics forum. Give me just a second and I'll move the thread there...
02-09-13, 08:33 PM
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Some details would be helpful:
Does it only skip in one or certain gears or gear combinations?
Does it ever skip when not under heavy pedaling pressure?
Does it shift smoothly between all gears?
Without seeing the bike, the only suggestion I have is to check the alignment of the rear derailleur hanger - if it is off by just a small amount it can affect the way the chain interacts with the rear cassette.
Another possible source of the problem is the freehub (the mechanism that allows the rear wheel to turn without the gears and chain turning). If the innnards of the freehub get fouled up or the grease deteriorates, sometimes it will cause skipping.
Does it only skip in one or certain gears or gear combinations?
Does it ever skip when not under heavy pedaling pressure?
Does it shift smoothly between all gears?
Without seeing the bike, the only suggestion I have is to check the alignment of the rear derailleur hanger - if it is off by just a small amount it can affect the way the chain interacts with the rear cassette.
Another possible source of the problem is the freehub (the mechanism that allows the rear wheel to turn without the gears and chain turning). If the innnards of the freehub get fouled up or the grease deteriorates, sometimes it will cause skipping.
02-09-13, 08:37 PM
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If it skips in any gear, and tends to skip every few pedal revolutions, a likely cause is a stiff link.
The easiest way to look for a stiff link is to push the RD lower pulley forward to slacken the lower loop until it sags about 1". Then backpedal slowly watching the chain as it comes off the lower pulley. You're looking for a visible hitch or a link that doesn't straighten immediately. If you find a stiff link try to flex it sideways with your thumb on the pin as a fulcrum. Also flush it with solvent, then let it dry and oil it. If you can get the link good enough to ride, it gets better with wear.
The easiest way to look for a stiff link is to push the RD lower pulley forward to slacken the lower loop until it sags about 1". Then backpedal slowly watching the chain as it comes off the lower pulley. You're looking for a visible hitch or a link that doesn't straighten immediately. If you find a stiff link try to flex it sideways with your thumb on the pin as a fulcrum. Also flush it with solvent, then let it dry and oil it. If you can get the link good enough to ride, it gets better with wear.
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Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
02-09-13, 11:49 PM
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While not a cure for your problem it's common advice to replace the chain when replacing the cogs. Andy.
02-10-13, 08:09 AM
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How did you measure the chain and determine that it was "good"? Within what specs? Chain checkers are notoriously inaccurate; the only method I trust is to measure the chain with a good steel rule.
Whatever the measurement, almost by definition a chain which skips on a new cassette should be replaced.
Whatever the measurement, almost by definition a chain which skips on a new cassette should be replaced.
