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Thread: Shimming the Tow Pac wheels

  1. #1
    250+ Posts dadztoy's Avatar
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    Default Shimming the Tow Pac wheels

    So with this Corona virus thing forcing all of us to stay home, being in the high risk category (old guy with pre-existing conditions) I thought I would put the time to good use and finally play a bit with shimming my Tow Pac cart wheels to be truly vertical (camber)...

    Both wheels are off a bit, but the right one ( sitting on bike) was the worst... I didn't take a "before" photo but it was off by about 1 to 1-1/2 degrees Negative camber...

    First thing I did was to manufacture some aluminum shims from some stock I had... I purposely made the holes in the shims large to facilitate wheel alignment. See photo below.

    image0.jpeg

    I had previous experience with wheel alignment on the Tow Pac cart and in some cases it is necessary to grind the holes in the plates a bit larger, hence the large holes in the shims... On the right side, it took 2 shims of about 1/8" thickness each to obtain vertical alignment of the wheel... See pics below...

    image1.jpeg

    image2.jpeg u

    image3.jpeg.





    It was also necessary to fabricate new brackets for the alignment stop screws as seen in the last photo... I will at some point in the future beef these up a bit by welding some additional material to them but I did not want to weld with the cart attached to the bike, so the cold roll plate will do for now...

    The end results of the shimming are shown in the photo below...

    image4.jpeg.

    After the vertical alignment I did a standard parallel wheel alignment and the right wheel is within 1/32" of an inch or less parallel to the rear tire...

    I would have done the left wheel too, but I need 2 additional 5/16-18 bolts for the new parallel adjustment brackets and what with the self quarantine going on here, that will have to wait until the all clear is sounded...

    Hopefully, this will end the uneven tire wear from having that negative camber on the tires, and might just improve the high speed fender vibration I experience over 70 mph...

    Les


  2. #2
    250+ Posts dadztoy's Avatar
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    Default Shimming Tow Pac wheels part 2

    So, re-threaded 2 metric bolts to 5/16-18 and started the other (left) side of trike... First picture shows level before I started...

    IMG_1767.jpg

    Next photo shows fender washers used for shimming which are about 1/16" thick as shown on digital caliper...

    IMG_1768.jpg

    img_1769copy.jpg

    And finally, the finished product as seen on level... Also realigned parallel adjustment to rear tire and is less than 1/32" out... Now, if it ever stops raining, we'll go for a test ride... As it turned out, because the washer was only about 1/16", there was no need to add an extension bracket to the adjustment stop bracket, so I did not need to use the 2 bolts I re-threaded...

    IMG_1770.jpg

    Les

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    Default

    as far as i know we are NOT forced stay home just stay away from other people many people think this is like a snow storm where they are supposed to stay off the street

  4. #4
    250+ Posts dadztoy's Avatar
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    Yeah, as far as we are concerned, at least for now, we can still move about, but like I said at the beginning of the thread, I have a few pre-existing conditions that require me to be very careful and not catch this Corona thing...

    So far, that means I can still go for a test ride 😁

  5. #5
    1000+ Posts CrystalPistol's Avatar
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    Quote Originally Posted by dadztoy View Post
    I would have done the left wheel too, but I need 2 additional 5/16-18 bolts for the new parallel adjustment brackets and what with the self quarantine going on here, that will have to wait until the all clear is sounded...
    How does it happen that a fella is short two bolts anyway?

    Your comment about welding while attached to bike reminded me of when I was rewelding the center stand legs to the feet with bike on stand to set the angle right after shortening the legs on my '85 GL1200 two wheeler. I had the battery disconnected but forgot it had a vent tube, heard loud pop, battery exploded internally, ruptured top seam. Cleaned up with lots of clear water & baking soda fast.

    Wondering if that fender vibration is alignment, wind, or balance induced. Maybe some hard plastic BBs in the tires would cure it if balance induced, them short tires spin fast to keep up at 70.
    Make Courtesy Your "Code of the Road" too!


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