Random rear end shimmy

jerryjlloyd

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Has anyone experienced a rear end shimmy in twisters for no reason? It’s weird and feels a tad disconcerting, it feels like the rear slips slightly thoughts please
 

Sierra1

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Easiest, and cheapest, check the tire pressure. That's the only time I experienced that on a bike with an axle. The Beemer started twitching, but the tech hadn't tightened the lug bolts, and the wheel was coming off.
 

Sierra1

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And, I am "assuming" that it not associated with road surface? Depending on temperature, and humidity, road markings/stripes are slick. But since they are narrow, they only give a second of instability. Down here they paint the stripes, and then put millions of SUPER tiny glass beads in/on the wet paint to provide the reflectability at night. But even plain paint can get slick.
 
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EricV

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When I've felt that kind of shimmy, it's been road surface related. I changed counties during a ride in TX and thought I had a flat or the wheel was coming off! Turned out to be nothing wrong with the bike, just more 'tar' in the asphalt of the road. Got down right squirrily! I was sure I had a flat, but the tire was fine. That was a BT EXP and those never graced my wheels again.

The Anakee 3 is usually pretty good in this regard, but every road condition is unique. I once ran across some grease on the road from a semi truck's 5th wheel. Fresh, clean grease. Oh, did I mention it was raining too and mid corner on Hwy 199 heading from Grants Pass, OR to Crescent City, CA, at night? It took me a while to get my riding pants out of my butt! I had grease all over my back and the back of the bike. Side stepped about a foot. Glad I kept it upright.
 

~TABASCO~

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An out side thought, when you change the rear tire and drive the rear axle back in to reinstall. Many times (mechanic) can’t torque the axle nut until they tighten the swing arm pinch bolt. Then they go tighten the axle nut and torque it down. But never go relieve the swing arm bind they have created. After torquing the swing arm axle everyone should then go back and loosen the pinch bolt and relieve the stress on the swing arm. I’ve seen many like this and some are pulled over 1/8 - 3/16 or more.
I say all this because it can cause rear wheel to feel strange in corners. I’ve talked to many customer about this. And point it out, not to let this happen. Check- double check the swing arm is “unloaded”.


Just a thought you might want to check.
 

jerryjlloyd

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Thank you for your comments and eloquence Eric

When I've felt that kind of shimmy, it's been road surface related. I changed counties during a ride in TX and thought I had a flat or the wheel was coming off! Turned out to be nothing wrong with the bike, just more 'tar' in the asphalt of the road. Got down right squirrily! I was sure I had a flat, but the tire was fine. That was a BT EXP and those never graced my wheels again.

The Anakee 3 is usually pretty good in this regard, but every road condition is unique. I once ran across some grease on the road from a semi truck's 5th wheel. Fresh, clean grease. Oh, did I mention it was raining too and mid corner on Hwy 199 heading from Grants Pass, OR to Crescent City, CA, at night? It took me a while to get my riding pants out of my butt! I had grease all over my back and the back of the bike. Side stepped about a foot. Glad I kept it upright.
When I've felt that kind of shimmy, it's been road surface related. I changed counties during a ride in TX and thought I had a flat or the wheel was coming off! Turned out to be nothing wrong with the bike, just more 'tar' in the asphalt of the road. Got down right squirrily! I was sure I had a flat, but the tire was fine. That was a BT EXP and those never graced my wheels again.

The Anakee 3 is usually pretty good in this regard, but every road condition is unique. I once ran across some grease on the road from a semi truck's 5th wheel. Fresh, clean grease. Oh, did I mention it was raining too and mid corner on Hwy 199 heading from Grants Pass, OR to Crescent City, CA, at night? It took me a while to get my riding pants out of my butt! I had grease all over my back and the back of the bike. Side stepped about a foot. Glad I kept it upright.
 

jerryjlloyd

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Thank you very much for that watch out

An out side thought, when you change the rear tire and drive the rear axle back in to reinstall. Many times (mechanic) can’t torque the axle nut until they tighten the swing arm pinch bolt. Then they go tighten the axle nut and torque it down. But never go relieve the swing arm bind they have created. After torquing the swing arm axle everyone should then go back and loosen the pinch bolt and relieve the stress on the swing arm. I’ve seen many like this and some are pulled over 1/8 - 3/16 or more.
I say all this because it can cause rear wheel to feel strange in corners. I’ve talked to many customer about this. And point it out, not to let this happen. Check- double check the swing arm is “unloaded”.


Just a thought you might want to check.
 

Dogdaze

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I normaly get that depending on road surface as Eric pointed out, I was going to say that sometimes when the tyres start to square off that happens, but as you have new tyres..................
 

ThisGoesToElevenere

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An out side thought, when you change the rear tire and drive the rear axle back in to reinstall. Many times (mechanic) can’t torque the axle nut until they tighten the swing arm pinch bolt. Then they go tighten the axle nut and torque it down. But never go relieve the swing arm bind they have created. After torquing the swing arm axle everyone should then go back and loosen the pinch bolt and relieve the stress on the swing arm. I’ve seen many like this and some are pulled over 1/8 - 3/16 or more.
I say all this because it can cause rear wheel to feel strange in corners. I’ve talked to many customer about this. And point it out, not to let this happen. Check- double check the swing arm is “unloaded”.


Just a thought you might want to check.
Was dealing with this same wandering rear end after a new rear tire... went to pull the rear wheel to check spacers and bearings when POP! Releasing the pinch bolt released all the bound up torque.

Problem solved! Thank you!
 

EricV

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Am I the only one that uses two wrenches to tighten/torque the rear axle nut? The only proper way is with two wrenches. If you catch someone doing it by tightening the pinch bolt, first, slap them in the back of the head. Second, never, ever, take your bike there again. It's basic mechanical training.
 

Grumpy

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I had two bad weaves with Anakee 3's, once with a pillion. I changed them barely half worn.
 

Fortech

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Am I the only one that uses two wrenches to tighten/torque the rear axle nut? The only proper way is with two wrenches. If you catch someone doing it by tightening the pinch bolt, first, slap them in the back of the head. Second, never, ever, take your bike there again. It's basic mechanical training.
Nope. I always use two wrenches also. Last week during my spring pre-ride check, I loosened the pinch bolt and used two wrenches to verify torque on the rear axle. Set the torque, then proceeded to torque the pinch bolt to spec. Wouldn’t have thought about doing it any other way
 

EricV

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I had two bad weaves with Anakee 3's, once with a pillion. I changed them barely half worn.
I never had an issue with the rear Anakee 3, but the fronts sucked. I gave up on the front Anakee 3. If I run another rear, I'll try some other front tire.
 
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