Rear Sprocket Thickness
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  1. #1
    Junior Member SuperDave23's Avatar
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    Changing out the sprockets and chain. Purchased new DID X-ring chain and JT sprockets. I've purchased many JT sprockets and they always fit perfect, until now. The front is fine, but on the rear for some reason they have machined down the inside of the sprocket. Quick thickness check with the calipers the stock is about 0.265" thick, the JT is about 0.16" thick. The overall sprocket on the JT is about the same, its just the inside that's thinner. I dry fit and the shoulder on the sprocket bolts now sticks thru so I won't be able to tighten down the bolts properly.

    Sprocket is a model JTR842-50 which says it fits a '91 TW200. The bolt holes lines up perfectly and the ID of the sprocket fits the hub perfectly, so I'm at a loss. Anyone offer any insight?

    Thanks,
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    Last edited by SuperDave23; 08-30-2019 at 05:30 PM.
    Dave
    91 TW200
    04 400EXC
    06 DR650SE

  2. #2
    Junior Member SuperDave23's Avatar
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    Doh! Found the thread I needed after I posted. Sprocket bolt lengths covered in depth here:

    https://www.tw200forum.com/forum/tec...olt-issue.html

    A couple of my bolts werent looking too good so I"m purchasing the Procycle kit which has bolts with shorter shoulders. Love Procycle!
    Last edited by SuperDave23; 08-30-2019 at 05:42 PM.
    Dave
    91 TW200
    04 400EXC
    06 DR650SE

  3. #3
    Senior Member TW-Brian's Avatar
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    This recessed area is pretty common on aftermarket sprockets. I believe that it is done to reduce the weight of the sprockets.

    Just add some washers under the nuts and/or the bolt heads to allow full thread engagement.

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  5. #4
    Senior Member TW_in_BC's Avatar
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    ...and if you use some Ny-locks as nuts, you can skip the "locking tabs".

    Or use some BLUE Loc-Tite...same effect.
    2008 TW200
    Southwest corner of BC Canada

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  6. #5
    Senior Member Darth's Avatar
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    Quote Originally Posted by TW-Brian View Post
    This recessed area is pretty common on aftermarket sprockets. I believe that it is done to reduce the weight of the sprockets.

    Just add some washers under the nuts and/or the bolt heads to allow full thread engagement.
    Any chance to shed rotating mass (weight) AND un-sprung weight is gold!
    Improved suspension, braking & acceleration.
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