Question about Colnago Freeship Ferrari Cx-20 Bicycle W/16" Rims Turbo

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Colnago C50 with 11 speed choras group set. When changing up to the big chain ring ready to decend whilst still in one of the largest 2 or 3 rear sprockets the chain slips off Please advice how to adjust the front mech to stop this problem

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Is the chain falling off to the outside? if it is you can adjust the "High " limit screw on front derailleur. There are two screws on top of derailleur usaully marked with a L or a H.Shift rear to small cog and front on large ring. Slowly turn screw marked H till you see front derailleur move in. When it starts to rub on chain back off 1/8 of a turn. Run the rear up and down a cuople of gears making sure nothing rubs and adjust accordingly . Same with the front. That should do it! Also when changing to the big ring up front you should try to be on a middle to small cog on the rear so you don't get into a "cross chain" situation. When running on the small ring you should be on large to middle on the back. Hope that helps you out.

Posted on Sep 13, 2010

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As these do wear over a period of time.

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I have a Huffy Savannah model 56770 16 speed. How do I shift into gear 7 through 16 ?


Google "bicycle shifting technique", for example:
http://coachlevi.com/cycling/complete-beginner-guide-to-bicycle-gears-shifting/
You should NEVER run cross-chained (big-big or small-small). The drive train performs best when the chainline is as close to straight as possible.
Excess sideways stress on the chain will wear it out prematurely and decrease its normal efficiency.
To demonstrate this for yourself, put the bike in the same combination of gears you're having a problem with. Get behind the bike and look straight along the top of the chain. As you can see the line of the chain is a mild zig-zag where it is parallel to the bike at each gear but needs to angle across the drivetrain in between. On some bikes the chain might even come in contact with the next larger chainring when used this way.
The big-big combo uses up all available chain length and the rear derailleur will be pulled toward the front of the bike, sometimes so far that it is in danger of being snapped off.
THERE IS NO UPSIDE TO CROSS-CHAINING.
As you can see, the rear derailleur is probably not long enough to **** up all the slack this gear combination creates. There are other combinations that would yield the equivalent gear ratio without either stressing the drivetrain or dropping the chain.
The basics of shifting are these:
1) The big ring and right side of the cassette in back are for speed.
2) The small ring and the left side of the cassette are for high torque, lower speed
Ancient bike wisdom for beginners: If your legs ache, shift down. If your lungs ache, shift up.

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You don't say if this happens in the BIG ring, small ring or both. If it's just the big ring I'd suspect there isn't enough chain length.

Cross chaining is unnecessary and bad for your drivetrain. I never go more than one cog past the center of my cassette opposite the chainring I use.

http://www.parktool.com/repair/readhowto.asp?id=26

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I have shimano rd6500 rear derailleurs. when chain is on small chain-ring and smaller rear sprockets the derailleur cage is rubbing against the chain.How do i tension chain to hold cage away from chain,...


If you learn to shift correctly this won't happen..

Google bicycle shifting technique, for example:

http://coachlevi.com/cycling/complete-beginner-guide-to-bicycle-gears-shifting/

You should NEVER run cross-chained (big-big or small-small). The drive train performs best when the chainline is as close to straight as possible. Excess sideways stress on the chain will wear it out prematurely and increase its normal efficiency.

To demonstrate this for yourself, put the bike in the same combination of gears you're having a problem with. Get behind the bike and look staright along the top of the chain. As you can see the line of the chain is a mild zig-zag where it is parallel to the bike at each gear but needs to angle across the drivetrain in between. On some bikes the chain might even come in contact with the next larger chainring when used this way.


If you can shift to the big-big combination without snapping the rear derailleur off, you're lucky. The big-big combo uses up all available chain length and the rear derailleur will be pulled toward the front of the bike, sometimes so far that it is in danger of being snapped off.

THERE IS NO UPSIDE TO CROSS-CHAINING.

As you can see, the rear derailleur is not long enough to **** up all the slack this gear combination creates. There are other combinations that would yield the equivalent gear ratio without either stressing the drivetrain or dropping the chain.

The basics of shifting are these:
1) The big ring and right side of the cassette in back are for speed.
2) The small ring and the left side of the cassette are for high torque, lower speed

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1 Answer

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The "H" screw is the one that is letting your chain jump of f of the ring. If the screws are not labeled, the way to distinguish the two is to shift the front as high as it can go and hold it there manually. Screw either adjusting screw in. If you are screwing the correct one, it either will not move at all or move only very slightly.
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1 Answer

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