6th Gen Swingarm ratio

Discussion in 'Mechanics Garage' started by northwood, May 7, 2016.

  1. northwood

    northwood New Member

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    So, I installed a DMr rear shock a while back. The bike suspension was better, but, did not snap into the turns as well as I remember and always seems sluggish. Also, a tell-tale was the heel of the kickstand was on the ground more than it was flat. So, I wanted to know the ratio of spacers in the shock mount to swing-arm movement.

    Givens:
    1. I just installed brand new roadtec 01's on the bike.
    2. I used a caliper to take measurements for the spacers.

    I measured from the top of the "axle" nut to the bottom of the inside of the socket head cap screw for the luggage rack shown below. This measurement came out to 14" before I started.

    IMG_4819.jpg

    I also but some old brake pads underneath to measure the under the tire distance. this came out to ~1" ±0.1".

    IMG_4820.jpg

    I then took two spacers, total thickness of .121", and ground a U-groove into them. I loosened the shock from the nut on the top and dropped it far enough down I could slide the two washers underneath on top of the shock mount. I then re-tightened everything and put a dab of gorrila glue from a toothpick on the back of the washers so they don't back out from vibrations (DO NOT get this anywhere else).

    IMG_4821.jpg
    IMG_4822.jpg

    This changed my height. Nut - Socket head cap screw measurement is now 14.25". Measurement under the tire is now 5/8" ±0.1".

    IMG_4824.jpg

    I will have to ride it a while to see a difference. My kick stand is back to even. If this helps a lot, I may make some more drastic changes.

    Thanks, have a good day.

    TL:DR, 6th gen shock height change to wheel height is ~2. If you stack 1" of washers (not that you would want to) on top of your shock mount, your rear tire should drop 2".
     


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  2. sunofwolf

    sunofwolf New Member

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    I have be the dmr shock on too and noticed it is sluggish seems lower to me, but its suppose to be actually a bit higher than stock. I think you could lower the forks instead of messing with spacers. I was worried about the correct
    length of the dmr caused this which it isn't same as stock. adj the forks might be a better way to go. I don't really know how to fix this, but lower the forks might make the bike less tippy too and balance the dmr shock.
     


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  3. northwood

    northwood New Member

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    Highly recommend this. I would have added one more spacer to increase the height of the rear. I won't try and fix what you want to do SOW, you already know everything.
     


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