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First I want to clear out what what I possess:

  • An Avon rowdy single soccer BICYCLE
  • An Avon rowdy DX double disk 21 geared cycle

I want to take out the gears from the DX to my single version. I can replace anything, but I wanted the body of my old cycle only. I require at least one disk brake and all the gears on my single speed cycle. Is there any way? Even by changing the complete drivetrain and the rear wheel? Any ideas?

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Avon single speed have no mounts for disc brakes on its frame and fork, so you can't mount a disc brake on it. To replace the fork is not always possible, as it changes the bike's geometry.

Next you should check the width of the rear hub. Usually single speed hubs narrower than geared, so probably you'll not be able to insert the rear wheel.

So I bet it can't be done.

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  • And is it steel frame..? So that lengths could be adjusted?
    – HARSH Roy
    Oct 20 '15 at 14:29
  • And are, truly Power brakes better than disk brakes?
    – HARSH Roy
    Oct 20 '15 at 14:30
  • Answer question-wise...
    – HARSH Roy
    Oct 20 '15 at 14:30
  • Like.. Answer 1, answer 2
    – HARSH Roy
    Oct 20 '15 at 14:31
  • Will replacing the fork solve all of my problems? Or just the disk brake.. Can't I replace rear forks? Answer
    – HARSH Roy
    Oct 20 '15 at 15:26
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So to restate, you want to move everything from the DX to the single-speed's frame? Depends primarily on the head tube length and diameter.

You want disk/disc brake, which means the front fork will require caliper/calliper mounts. If the existing SS frame has mounts already then the existing fork could be okay. Otherwise you're up for moving the front fork over from the DX. If its the wrong diameter, the new fork won't fit in. If its the wrong taper, it won't fit in. If its the wrong length, it won't secure. So you may stay with the existing rim brakes, rim and wheel.

Swapping the transmission over requires the rear dropouts to be the same or very close to the same width. Otherwise the geared wheel will not seat properly and can move under load.

Your front cranks may be okay to swap for the double or triple chainring, but it depends on the bottom bracket connection being the same.

To be honest, this sounds like a frankenbike which will use up a lot of time and may be unpleasent to ride.

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    You also need a derailleur mount on the rear dropouts, otherwise you'll have to use a cheap, nasty axle-mounted rear derailleur. Many single-speed frames don't have the mount, often because they have horizontal dropouts where the derailleur mount doesn't work very well. Fortunately the Rowdy comes with that style of derailleur.
    – Móż
    Oct 21 '15 at 0:28

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