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Gear removal..is it ok

Started by timmosav · · Last activity · 7 posts · 947 views

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01 / Original postGear removal..is it oktimmosav · 18 May 2005 02 / This pagePosts 1–7Page 1 of 1 · chronological order 03 / Latest replyPost #7timmosav · 19 May 2005

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Original section
Cycling Equipment
Published
18 May 2005
Last activity
19 May 2005
Original author
timmosav
Posts
7
Discussion status
Public discussion
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947
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Topics
Single-speed and fixed-gearChain lengthRear derailleurs

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  1. Original post
    timmosav
    Archived post
    #1

    My 12 yr old lad, loves riding up and down hard dirt hills and jumping his bike with the consequence that I am forever adjusting gears and chains etc which come off the derailleur.

    He now tells me he never changes or uses the gears, so I wonder if my life could be simpler by actioning the following, which hopefully will stop chain jumping etc.

    Disable the gear mechanisms completely, and shorten the chain over two of the sprockets as a fixed entity.

    Is this possible or do I also have to change the sprockets out.

    If it is possible which would be the best two sprockets to fit the chain over - largest to largest, large to small etc - there are 3 sprockets at each end of the chain system at present.

    Thanks

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  2. artmichalek
    Archived post
    #2

    Start by picking a chainring/cog combo that gives the right ratio, then work on getting them lined up. Typically, this kind of conversion involves taking the desired cog out of the cassette and putting spacers on either side of it to get it lined up with the chainring. You could also just break up the cassette and shuffle the cogs around to get the one you want in the right possition. The only thing that matters is that the chainring and cog are the same distance from the center line of the frame. There might also be an issue with the chain length if the bike has vertical dropouts. If this is the case, you can either add a chain tensioner or lock out the rear derailleur to act as one.

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  3. boudreaux
    Archived post
    #3
    artmichalek said:

    Start by picking a chainring/cog combo that gives the right ratio, then work on getting them lined up. Typically, this kind of conversion involves taking the desired cog out of the cassette and putting spacers on either side of it to get it lined up with the chainring. You could also just break up the cassette and shuffle the cogs around to get the one you want in the right possition. The only thing that matters is that the chainring and cog are the same distance from the center line of the frame. There might also be an issue with the chain length if the bike has vertical dropouts. If this is the case, you can either add a chain tensioner or lock out the rear derailleur to act as one.


    You are assuming he has a cassette and not a freewheel.

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  4. timmosav
    Archived post
    #4

    Had a closer look last night if this means anything

    The gears have a name Shimano or similar on them.

    At the back of the bike the chain goes down through a sort of open cage at right angles almost to the sprockets then returns to the front ones.

    The sprockets I was slightly wrong about - there are 3 at the front by the pedal which look fixed together (the chain goes over the edges of these sprockets) at the back there seems to be 4 or 5 again they seem pretty fixed together to me, the chain seems to sit in between these sprockets.

    On the handlebars are twist grips one with 3 numbers on, the other 6, the bike seems set at about 2 and 5 at the moment.

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  5. bikeguy2004
    Archived post
    #5

    [font=Times New Roman]Sound like you want to convert the bike to a single speed bike. Use Google to search for “single speed bike”. Or search the forums. But it maybe best and simplest to go to a local bike shop with the bike and ask them if they can convert the bike to a single speed bike.[/font]

    [font=Times New Roman]OR… plan B. The child is 12… maybe it’s time for him to start learning how to take care of the bike? One web site that is provides some info about repairs the Part Tool web site.[/font]

    [font=Times New Roman]parktool.comFAQindex.shtml[/font][font=Times New Roman] [/font]

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  6. gclark8
    Archived post
    #6

    I think it would be far easier to teach him the gear usage first.

    It sounds like a Mountiain Bike.

    Put the rear derailleur in the middle cog, teach him ride on the flat in the middle chainring (on the front), use the small chainring up the hills and the large chainring down the hills. A 3 speed.

    Later you can get him to leave the front in the middle and just use all the rear gears. A 6 speed

    Some time later teach him to combine the 2, use the middle front and all the rear, and just the small front for up big hills and the large front for down hills, a bit like an over drive, he will then work it all out. A 8 speed.

    Save the work, show him this post... a challenge.. 😎

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  7. timmosav
    Archived post
    #7

    certainly worth a thought and I appreciate your help.

    Gears to me have always been a "black art" as in my days of cycling having 3 gears was thought brilliant 🙂

    I think you're right and I will give this a try this weekend.

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