putting gears on commencal supreme 20"- Mtbr.com
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  1. #1
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    putting gears on commencal supreme 20"

    my son has a commencal supreme 20 dh bike that came set up as a single speed. It has the der hanger and the ability to mount gears, shifter and derailleur. Can I mount any derailleur gears etc... or would something specific be better.

    Really I have no idea yet. Was thinking some sort of short cage derailleur and I don't need it to be overwhelming for a 6 yr old so just a few gears would work good. Any ideas?

  2. #2
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    Hey man, yeah I'd throw a 10 or 11sp shimano XT setup on there. 11-42 cassette would be ideal with a 30t chainring up front. You may need to swap BB and cranks. You'd want some 130mm cranks +- for that size. Spawn makes some that are pretty nice.

  3. #3
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    there are dh cassets... that range from 6-7 speed. Oneup has converter for shimano. 4x bikes used to run sometimes 3-4 speeds only using standard cassets w/ single speed adapters/conversion kits.

  4. #4
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    So basically I can use anything. The rear hub is shimano compatible already.
    -make sure i can get a 32 tooth ring up front to work
    -change cranks or bb if needed to make ring fit
    -any casette
    -any suggestions on der, short or med cage? I think a long cage will be too long

    I will look into the oneup and 4x bikes stuff. Dh casette would work but it wouldnt hurt if I can make it a bit lighter

    The bike rocks for dh but he wont get off of it and has been riding it on trails as well
    Thanks

  5. #5
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    defiantly want to run a short cage, especially for kids bike. When you start researching 4X bikes, you may notice they are running/recommending road cassette, this is because of the closer gear ratios.

  6. #6
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    Yeah, anything that doesn't use a XD driver will work. Short cage SRAM GX 10sp 30x11-36 has been great on my son's Rokkusuta 20. If this is a dedicated gravity bike I'd go 32x11-32, same RD and shifter.

    I ran a med. cage GX with a 11-42 cassette on his Flow for a while and wouldn't do it again on a 20". The lower jockey wheel gets really close to the ground, and the chainstays are so short that the chainline gets pretty severe in the big cogs.

  7. #7
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    Follow the link and you'll see the Supreme 20 I built back in 2014.
    Will be selling it on very soon but its a custom build with 10speed 11-36

    http://forums.mtbr.com/families-ridi...ss-937294.html
    MTB: Stumpy, Enduro, Hotrock, Commencal Supreme
    ROAD: Jamis Zenith, Pinarello Dogma

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