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I have a huffy cave creek 21 gripshift bike w. shimano components and need instructions how the gears work

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  • susanjorg May 28, 2011

    I don't want to replace anything; I want to know how to use the gears ie how do you shift gears?

  • susanjorg May 28, 2011

    Yes. I understand what to do. As a beginner It would have been more helpful if someone outlined what the different gears do ie is a higher gear for uphill grades and the lower ones for downhill grades. For the price I paid for my original question, I would have thought that would be included.

  • susanjorg May 28, 2011

    Thank you! That was very helpful. At least I have a starting point.

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Trying to fix the module on the grip-shift is always a waste of time. The best thing to do is replace the shifter.

The shifter pulls the cable tight toward the shifter and uses a rachet mechanism to insure the chain is always in alignment under one gear and does not fall between two gears (like the original multi-sproket bikes from the 1970''s and 80s).

The derailer near the sproket has a spring to pull the cable back for the smaller diameter gears when the shifter is turned the other way.

The light-weight pastic gears and rachet mechanism in the twist grip tend to strip and fail. The small plastic gears are not available as replacement parts except for the highest end shifters (trigger shifters). The twist shifters are considered low-end to mid-range and replacement parts were never available that I remember.

To replace the twist grip, make notes how the cable routes to the corresponding derailer. Detach the cable near the derailer and pull it through to the shifter. Remove the shifter from the handgrip. Pullt he cable through. Pull the cable though the new shifter and mount it onto the handgrip. Route the cable through the rest of the frame as needed (see notes you made earlier). Adjust the cable to just tight enough to keep the derailer above the sproket indicated on the shifter. You may need a pair of locking pliers to hold the cable tight before locking downt the nut on the derailer. There is a fine adjustment screw on the derailer to make final adjustments if needed (they usually are).

Shifters are available at most bicylce stores. You can also find many fairly new bikes on craiglist that you can strip for parts (as little as $25 for the bike). Sometimes they are given away for free on craigslist and you may find an exact replacment - we did!).

Shifters from the bike shops cost $20 to $50 for a Huffy (depending on the bike store).

Good luck, I hope I understood what you wanted from your question.

-Mark

Posted on May 28, 2011

  • Mark T
    Mark T May 28, 2011

    Sorry for the misunderstanding.

    To shift, just peddle and twist the grip firmly but not too quickly. Make sure you are peddling or you will only stretch/stress the cables and not change gears.

    The idea is to keep your legs moving at a near constant rpm (revolutions per minute). 70 rpm is reasonable for warm ups (first mile) and 50 to 60rpm for regular riding. For a beginner,you can set the front gear (with your left hand) to the middle sprocket. Then use the right hand shifter as your main control when you ride (change back sprockets). Shifting (changing sprockets) allows you to keep putting the same leg power into the ride while controlling power to the back wheel for speed (small back sprocket for going down hills fast) or power (large back sprocket for going up hills). use the sprockets in the middle for flat an light hills. You don't have to watch which sprocket you are on, just shift until your peddle speed is in you comfort zone.

    Remember, you don't want the gears "too tall" were your rpms are too low (less than 20 or 30) because it will be bad for your knees because it takes a lot of stress. Most new rides just forget to shift. Stay focused and the more time you can keep it in the comfort range (50 rpms), the more comfortable your ride will be.

    Good luck and have fun.

    -Mark

  • Mark T
    Mark T May 28, 2011

    in general, the higher numbers on your twist shifters make it more difficult to pedal but you will go further with each pedal (This is good for flat or down hill).

    The lower numbers on the twist grip are better for hills. There is no right or wrong gear for you, however becasue it is very dependent on the terrain you are driving on, your skill level and your level of conditioning & strength.

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