25Mar/103
A Mountain Bike having Gear Changing Problems?
Hi....
Well I currently have a Hardrock Comp. Specialized mountain bike. In certain gears they will skip "teeth" on the gear and when I shift into lower gears sometimes the front wont change and sometimes the chain wont catch the gear at the rear and the chain will slide right off.
Is there an adjustment...or needs to be greased...or is it possibly dirty?
Best Answer:
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March 25th, 2010 - 10:42
ajustment, take it to the shop, theyll know… the cables is porbbly loose.
March 25th, 2010 - 11:38
It just need simple adjustments. From adjusting the cable to turning the barrel adjusters to setting the H and L limiters.
Try the instructional vids in youtube. If you cant figure it out, go to a bike shop. Some bike shops will do a basic tune-up for you for under $20 and includes derailleur and brake adjustments.
March 25th, 2010 - 11:59
The problems you describe could be from a few different issues. While there are adjustments for both the front and rear derailleurs as well as the shifting cables they may not be the only cause of your problems.
If you have a worn out (stretched) chain or a worn out chain that has caused excessive wear on the cassette you may not be able to solve your problems with adjustment alone.
If you aren’t well versed in derailleur adjustments or how to measure to find out if your chain is stretched, it may be best to take it to your local bike shop. They can do it all for less than about $20 (unless you need a new chain or cassette).
A really dirty chain can cause shifting problems most noticeable on the rear cassette but it wouldn’t usually cause the chain to skip once on the cog. Cleaning the chain periodically is always a good idea regardless of problems and its a good time to check it for wear.
Use a metal ruler and measure from the center of one pin – along the length of chain for 12″ to the center of the pin nearest the 12″ mark. If that pin is 1/8″ or more beyond the 12″ its time for a new one. Trust me, if you don’t replace it then, you’ll be soon be replacing your cassette.
Best to use a good chain lube on the chain instead of any kind of grease. Grease may be fine in a hub bearing but its not what a chain needs for proper lubrication.