Xr200 front wheel sprocket mount
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Xr200 front wheel sprocket mount

This is a discussion on Xr200 front wheel sprocket mount within the Technical forums, part of the Caferacer.net Forums category; I have a project where I need to chain drive a 21" wheel. Low horsepower type thing. I don't really wanna lace up a 21" ...

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Thread: Xr200 front wheel sprocket mount

  1. #1
    Senior Member raven's Avatar
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    Xr200 front wheel sprocket mount

    I have a project where I need to chain drive a 21" wheel. Low horsepower type thing. I don't really wanna lace up a 21" rim to a rear hub because its a low buck type thing. So I am proposing drilling a sprocket to fit the studs that the spoke flange on about a 1980 model wheel attaches with. These are four M6 studs. I do not have a wheel on hand yet, but does anyone see a glaring issue with this?
    Bike:
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    Honda S90 (box of parts)
    Honda CB750C (runs)
    The Others (mostly rolling wounded)

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  2. #2
    Senior Member 8ball's Avatar
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    Four M6 studs doesn't sound substantial enough, to me. What does the spoke flange do in the original config? What stresses would it see? Without a cush drive, especially, I would think that those small studs would just rip out ..even with as low as 10 HP. If this is for a motorcycle, look at the original application. Usually it would have 6 M8 studs, or better. With a larger wheel diameter, you will have a greater moment arm reacting against the drive sprocket studs.
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    Senior Member 44dwarf's Avatar
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    Use the later disk brake wheel and put sprocket on same bolt pattern as the disk?
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  5. #4
    Senior Member raven's Avatar
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    I will have to get the wheel in hand and take a look. Alot depends if i can add studs or reinforce it in some way. I may end up lacing a wheel after all.



    The flange originally carried radial load from the spokes and I would estimate 50% of the torque load from braking (as half the spokes attach to it). Braking load is different from the "pounding" load of an engine however as its primarily a single direction torque when the brake is applied. With engine braking and power pulses I could see where the M6 studs could be quickly fatigued if they are not ripped from the hub. Thanks for the input.

    I would go w/ the disc but I want the drum :/
    Bike:
    Buell X1
    Honda S90 (box of parts)
    Honda CB750C (runs)
    The Others (mostly rolling wounded)

    My collar may be a little frayed, and maybe I need a shoeshine. But nobody\'s got a mortgage on my soul. I own it. Free and clear. -Phil Lovecraft

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    Senior Member hillsy's Avatar
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    Quote Originally Posted by raven View Post
    I would go w/ the disc but I want the drum :/
    You could do what the HD chopper guys do and use one of those sprockets that doubles as a disc rotor.

  7. #6
    Senior Member raven's Avatar
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    Well. What this is for is a semi sort of pannier tank AJS replica. I'm thinking lacing to a more suitable hub will be best.
    Bike:
    Buell X1
    Honda S90 (box of parts)
    Honda CB750C (runs)
    The Others (mostly rolling wounded)

    My collar may be a little frayed, and maybe I need a shoeshine. But nobody\'s got a mortgage on my soul. I own it. Free and clear. -Phil Lovecraft

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