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Slipping Gears newbie question

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Slipping Gears newbie question

Old 04-30-07, 09:22 PM
  #1  
geminus1982
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Slipping Gears newbie question

Hello All!

I am not new to mountain biking, but I have been on an 8 year hiatus from this great sport. I just bought myself a Gary Fisher Tassajara and took it out for my first long run today. I noticed it doing something I remember my other bikes doing from the time when I was a kid. I had the bike in its gear and while pedaling it would "miss" almost like a car backfiring..i.e. like it was shifting gears while i pedaled when i had not changed the gears with my hands...this is a very dangerous side effect I find because it's almost impossible to stand up and pedal without the fear that its going to shift or "click" which could make me lose my balance and come crashing down. Is there something wrong with my bike or is there somethng I am doing wrong.

I thak you for your help in advance.
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Old 04-30-07, 09:26 PM
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FreeRidin'
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Your derailleurs most likely need some adjusting. Either take your bike to your LBS, or learn how to do it yourself...
http://www.parktool.com/repair/readhowto.asp?id=64
http://sheldonbrown.com/derailer-adjustment.html

Or your cassette could be worn out, or your chain could be stretched. How old is this bike?
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Old 04-30-07, 09:55 PM
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Quick_Torch C5
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Originally Posted by geminus1982
Hello All!

I am not new to mountain biking, but I have been on an 8 year hiatus from this great sport. I just bought myself a Gary Fisher Tassajara and took it out for my first long run today. I noticed it doing something I remember my other bikes doing from the time when I was a kid. I had the bike in its gear and while pedaling it would "miss" almost like a car backfiring..i.e. like it was shifting gears while i pedaled when i had not changed the gears with my hands...this is a very dangerous side effect I find because it's almost impossible to stand up and pedal without the fear that its going to shift or "click" which could make me lose my balance and come crashing down. Is there something wrong with my bike or is there somethng I am doing wrong.

I thak you for your help in advance.
Some low end derailleurs will do this, my GF has Shimano Alivio on her Haro, and my friend has a Specialized Hardrock w/ SRAM SX4, and they both have problems with shifting despite adjustments and proper lubing. I also notice the shifting distance is very long and inconsistant on my bud's SX4, which could mean you're pushing too far or not far enough on the trigger, which may causing the shifter to ghost shift or run "in between" gears. Personally, I run SRAM X9, and I have ZERO problems with shifting
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Old 04-30-07, 11:32 PM
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it is a brand new bike....they set it up for me at the store but i am quite the big guy...6'1" and 330 lbs...so i wondered if something wasn't set right on the deraillers
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Old 04-30-07, 11:38 PM
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the new bike i got has
F.Derailleur Shimano Deore
R.Derailleur Shimano Deore LX

here is a link to which bike it is...
http://www.bayviewcycle.com/NewFiles...TASSAJARA.html
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Old 05-01-07, 03:36 AM
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If the bike is new then I would suggest one of couple of itmes. First, you may be feeling the derailleur skip due to cable stretch. It's fairly common to have to tweak the derailleurs once you've ridden it a bit due to the shifter cables stretching or slipping as you start to use them on the trail. Second, your shop will test ride your bike after they build it to make sure that they've got everything set properly but generally that's done in the parking lot and can't really simulate the hard work you're going to ask your bike to do on the trail. It could be that your shop missed slightly on the derailleur setup. Finally, and this would be a worst case scenario, your bike may have been put together by a high school kid who didn't know what he was doing and didn't bother to test ride the bike to check its setup. Unfortunately it happens in some shops.

The fix is the same regardless of what happened. Take your bike back to the shop and describe the problem to them. They'll probably check and adjust the derailleurs and should be able to get you straightened out. Since your bike is new you will probably want to have it checked again after you've put some miles on it. After that you just need to keep up with cleaning and lubrication and you should be fine.

If you're mechanically inclined I'd recommend picking up a book like Park Tool's Blue Book of Bicycle Repair or Zinn and the Art of Mountain Bike Maintenance. These books will give you all the info you need on keeping your bike in good riding condition and will help you make fixes when things do start to wear out and break. If you're not inclined to do your own maintence, pick up a cleaning kit of brushes, soap, and a bucket and get some chain lube. After each ride, use the brushes to clean the crud from around the drive train and then lube the chain. Once a month, or more frequently if you ride a lot, wash the bike pretty thoroughly with soap and water, dry the chain and then lube it. Shift through all the gears, check that the brakes work smoothly, check your stem and forks for smooth movement and tight fasteners, and do a visual check for any loose or damaged parts on the rest of the bike. Keep your ears and eyes open for any signs of a problem and get it fixed early to avoid really big repair bills later.
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Old 05-01-07, 03:40 PM
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Originally Posted by mcoomer
The fix is the same regardless of what happened. Take your bike back to the shop and describe the problem to them. They'll probably check and adjust the derailleurs and should be able to get you straightened out. Since your bike is new you will probably want to have it checked again after you've put some miles on it. After that you just need to keep up with cleaning and lubrication and you should be fine.
Agreed. Time for the "new bike tune up". It's so common that any good shop will give you at least one freebie tune up after buying a new bike.
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