Author Topic: Rear end Wobble  (Read 461 times)

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Offline Mozzachio

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Rear end Wobble
« on: April 23, 2019, 03:05:57 pm »
I replaced tires this weekend with Shinko 011's and the bike has developed a wobble at highway speeds.  It was fine before the tire switch and is fine at low speeds.  I mounted and balanced them myself, figured it was a balance issue and had them rebalanced at the local dealer, but it still has the same wobble that starts at 60mph. 

The tire looks fine.  I replaced the wheel bearings about 5K miles ago and everything is torqued correctly.

BTW this is an '04 with 34K mikes, Racetech Springs and emulators, fork brace, ZZR rear shock, GSXR front calipers and to my knowledge has never been down.

Anyone else ever have this problem? Bikebandit is sending me replacement tire but I thought maybe I was missing something.

Thanks for any advice you can give.

Mark
Back on a Connie-1000 after ten years on other bikes.

Former bikes
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Offline MotoCommuter

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Re: Rear end Wobble
« Reply #1 on: April 23, 2019, 05:16:31 pm »
Tighten the steering stem head nut. Happened to me on my ‘02, new tires, lots of rear wiggle around big trucks at highway speed. Went thru the entire suspension but ended up being the steering stem head nut need to be a little more snug.
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Offline Mozzachio

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Re: Rear end Wobble
« Reply #2 on: April 23, 2019, 11:22:16 pm »
Tighten the steering stem head nut. Happened to me on my ‘02, new tires, lots of rear wiggle around big trucks at highway speed. Went thru the entire suspension but ended up being the steering stem head nut need to be a little more snug.

I never would have thought of that.  I'll check it tomorrow.  Thanks
Back on a Connie-1000 after ten years on other bikes.

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Offline Chuck Landis

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Offline Mozzachio

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Re: Rear end Wobble
« Reply #4 on: April 24, 2019, 04:10:51 pm »
http://forum.cog-online.org/tiressuspension-c10/shinko-verge-on-front-feels-like-i'm-riding-on-marbles/


Ouch.  Maybe I should have searched this BEFORE I bought and mounted the tires :-\.

Thanks, not that this makes me feel better LOL
Back on a Connie-1000 after ten years on other bikes.

Former bikes
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Offline connie_rider

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Re: Rear end Wobble
« Reply #5 on: April 24, 2019, 06:07:54 pm »
Mozzachio, from your list of suspension mods I know your bike is well maintained, so I'm doubtful tightening the steering stem will  make much difference on your bike.

There have bene several reports on the wobble feel.
The Shinko tires came up more than once, but not all.

I experimented and went to another tire size. 180/60R-16.
I am not suggesting doing it, but I may have learned something.
The tire I tried didn't wobble, but was easily pushed around in the wind, didn't feel stable on the hwys.,, and {I think because of the tire profile} will turn in "really" quickly.
"Great" in the twisties, but not so good in traffic...
We improved the feel by decreasing tire pressure 5*. {May try 10* later}
     We think the pressure drop slowed the turn in by altering the tire profile a bit.. {err maybe  :017:}

Before you mount new tires, would you decrease your pressure and do a ride?
Let me know if it makes any difference?
NOTE: If the problem is weak sidewalls, it may get worse.
          If the problem is tire profile. It may get better.

Ride safe, Ted

PS: The suspension on my C-10 is set up similar to yours with similar parts.

« Last Edit: April 26, 2019, 03:28:15 pm by connie_rider »
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Offline Mozzachio

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Re: Rear end Wobble
« Reply #6 on: April 24, 2019, 11:51:56 pm »
Conie_rider

Yep the steering bearing was fine and a slight tightening made no difference.

It really has to be the tires because this bike was rock solid with old tires and the front was a little cupped.  I'm going to buy a set of the Avon AM26's that so many have used with good results on this bike.

Funny thing is that at speeds below 55mph these tires are spectacular.  The turn is fast but stable and they are very confidence inspiring, unfortunately most of my riding is my daily commute on the highway and it is scary at 65.

I will give the lower air pressure a shot when I get a chance and let you know how it goes.  I'm working late for the next few nights so it might not be until Sunday.

Thanks for the input
Back on a Connie-1000 after ten years on other bikes.

Former bikes
LTD 440, GS740E, Hawk400, LTD 1100, Pacific Coast, 01 ZG1000, R1200GS, ST1100, NC700X

Offline Mozzachio

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Re: Rear end Wobble
« Reply #7 on: April 28, 2019, 09:39:11 pm »
OK.  I purchased a set of Metzler 888's and mounted them today.  Man they were a bitch to mount but it is done.

No other changes to the bike and it is rock steady right up to 90+.   So I guess the Shinko 011 Verge does not work on the S10.
Back on a Connie-1000 after ten years on other bikes.

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Offline mnbikeguy

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Re: Rear end Wobble
« Reply #8 on: April 28, 2019, 10:11:32 pm »
Yep, the Shinko 011 Verge's will make you pucker and pray for sure. Glad you're back on some reliable rubber.

Offline Rastus

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Re: Rear end Wobble
« Reply #9 on: April 28, 2019, 11:20:00 pm »
Are the Shinko 11’s radials? I had the same problem with a set of Avon Storm radials. While I suspect rear-wheel balance may have been part of my problem, I also wonder if the C10 just prefers bias ply tires. I replaced the rear Storm with a bias ply Michelin/HD tire, and rock solid stability was back. Currently have a Michelin/HD radial on the front. When I wear these out I will try a set of Avon AM26’s. I had good luck with v-rated bias ply tires on my Z1-R.

Offline Greenie

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Re: Rear end Wobble
« Reply #10 on: April 29, 2019, 12:13:32 am »
I've mixed radial and bias tires and never felt any difference. I've had problems with both Avon and Shinko and would never try them again.

Offline connie_rider

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Re: Rear end Wobble
« Reply #11 on: April 29, 2019, 12:21:57 am »
Rastus, all Connie's came with radials.
In the last few years we've started to see this wobble problem when people install radials.
Lots of idea's, but no one knows why it is happening.

Ted
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