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Why does my front end shimmy above 30mph?

This is a discussion on Why does my front end shimmy above 30mph? within the Grizzly Tire & Wheel Combos forums, part of the Grizzly Forums category; 07 700 with 26" ITP Terracross. Anytime I get the griz above 30 a fairly powerful shaking, or "shimmy" starts to make the bars try ...


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#1
03-14-2009, 04:15 AM
07 700 with 26" ITP Terracross.

Anytime I get the griz above 30 a fairly powerful shaking, or "shimmy" starts to make the bars try to go side to side. Any ideas on what this could be?
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03-14-2009, 05:50 AM
<div class='quotetop'>QUOTE (redrub04 @ March 14, 2009, 5:15 AM) <{POST_SNAPBACK}></div>
Quote:
07 700 with 26" ITP Terracross.

Anytime I get the griz above 30 a fairly powerful shaking, or "shimmy" starts to make the bars try to go side to side. Any ideas on what this could be?[/b]
You probably need to have your tires balanced
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#3
03-14-2009, 06:02 AM
Also check for "play" in front wheel bearings.
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#4
03-14-2009, 06:23 AM
Had same problem same tires need to have ballanced.It solved my problem.
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#5
03-14-2009, 09:40 AM
could also be a loose or bent tie rod. does it look like the toe is out one way or the other?
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#6
03-14-2009, 10:16 AM
I am not a mechanic, but have had this happen to me. "Usually" when it is an alighment problem you will get the "shimmy" between certain speeds, so if it smooths out after you get up around forty or so, it is probably your alignment and if it gets worse, it is "probably" your tires that are out of balance. Just a thought based on conjecture more than knowledge.
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#7
03-14-2009, 05:49 PM
It's not alignment or balance. You have a bad tire or tires. The qaulity control on atv tires is nothing near what car tires are. ITP has had many issues with this on there radial tires. Especially terracross and XTR.
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#8
03-15-2009, 10:46 AM
I had the same issue at around 40 mph. Turns out my TerraX tires were out of round. You could actually see the wobble in the tire when you spun it on the ballancer. One was 7oz out and the other was 5 oz. I contacted ITP and they wanted to replace the 7 oz one, but said that the 5 oz was within specs. I said there was no way I was going to replace just one tire in the front end after several hundred miles, esp when the new ones would be the heavy duty ones and the guy that spun them said if they were truck tires he wouldn't put either one back on, and they agreed to send two new front ones.

I haven't mounted the new ones yet, since I'm still on my tracks, but I'll be sure to spin them before I put them on the quad. I will probably buy two new ones for the back too and sell the entire set of old ones cheap and let the buyer know about them being out of round.

I'd go get your wheels spun and see how bad they are. I don't think 7 oz out is even worth the weight to ballance them, and even if I had, the visible wobble wouldn't be fixed by weight anyway. Hopefully the new TerraX is made better.
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#9
03-16-2009, 09:40 AM
All, I had the exact same problem with my Terracross Tires. I contacted ITP and they sent me two new front tires. I was not able to find anyone that would balance my tires locally. Seems like ITP may need to address this issue since there are many posts on here about the shimmy problem. My machine wobbled being new with the Terracross so it had nothing to do with damage or an out of spec front end.
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