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Rear End Wobble

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  • Rear End Wobble

    Hello everyone. Thanks in advance for any constructive comments. I have an 07 RoadStar that I picked up a few months ago. I am getting a side to side wobble on the rear end when I am going about 80 and hit a bump. Bike has a new tire and tire pressure is fine. I don't have any history on the bike so let's assume nothing. It has hard bags and about 22K miles. I'm thinking of getting a roadwing shock and see what happens. Thoughts, opinions?

  • #2
    What shock do you have in the rear? Where is the preload set? What tire pressure? Have you checked the bearings? What tire brand and model?

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    • #3
      A roadwing is nice but you need to make sure swing arm bearings aren't the cause of your problem, or the roadwing won't fix it. Wheel alignment is also crucial. Don't go by the notches in the swing arm.



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      • #4
        Sometimes you can get a complete failure here and that will cause a wobble also.
         

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        • #5
          What tire brand do you have on the back? If it is a Shinko get rid of it. I had the same issue with a Shinko 777 WW HD from the minute I installed it, I had it replace under warranty and the replacement did the same thing. After some extensive investigation I found the sidewall to be weak and flexing causing the wobble. I replaced it with a tire that had a stronger sidewall and the problem went away.

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          • #6
            im happy to hook you up with a roadwing but i agree have your swingarm and wheel bearings checked as well as the rear wheel alignment. along with front and rear air pressure in the tires.
            my Wallet is Getting dangerously close to spontaneous combustion

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            • #7
              Thanks everyone for the help. I have Avon Vipers on there. I am going to have the swing arm bushings inspected as that was where my thoughts were. I will replace the shock too as it likes to bottom out when I'm two up. The alignment and balancing of the rear wheel is also easy enough to do so that's on the agenda as well.

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              • Agpilot
                Agpilot commented
                Editing a comment
                What size is the rear tire? The only Avon Viper I can find is a scooter tire?? If it is a smaller than a 150, and the viper is a 130, it could be your problem. I tried the smaller tires on mine and it was unsafe and very twitchy. Changed them after about 100 miles.

            • #8
              Suggest you check wheel bearings and shock mounts while your in there.

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              • #9
                So, yup looks like the swing arm bushings have gone out. Rear tire pressure was a little low but not too bad. Thanks everyone. I'll update again after repairs.

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                • #10
                  You say you just got the bike, with that said I would be suspect of the mileage on the bike. Swingarm bushing don't go out/bad at 22K. Maybe 122K but not common even at that mileage.

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                  • #11
                    I agree Davej. I thought that was odd as well. I called the shop where the guy said he did the services and the dates and millage add up.

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                    • #12
                      in that case I'm gonna have to say that IMO a diagnosis of swing arm bushings being bad is a bad diagnosis.

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                      • #13
                        Well I had the swingarm bushings and shock replaced at the same time. It has rid the bike of the rear end wobble. I wanted to do the jobs individually to see which was the culprit but it didn't make sense. I replaced the shock with a smokescreen's roadwing shock. Glad to feel confident in the bike again.

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                        • #14
                          I just Love a Happy Ending!

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