Do apes contribute to the Dyna wobble?
#11
07-23-2011, 03:58 PM
#13
07-23-2011, 05:17 PM
Cruiser
Bikerlaw, Since the geometry of the bike's original stance has been altered, have you re-checked the trail of the front wheel?
Google "Rake and Trail" there are many site that have good explanations.
Too little trail will result in the "death wobble" you are experiencing.
TOO LITTLE OR NEGATIVE TRAIL
With too little or negative trail (steering axle mark behind the front axle mark), the bike will handle with unbelievable ease at low speeds, but will be completely out of balance at high speed. It will easily develop a fatal high-speed wobble. EXTREMELY DANGEROUS!
NORMAL TRAIL
Normal trail is somewhere between 2 and 4 inches. The bike will handle easily at both high and low speeds. Flowing smoothly through curves without swaying or wobbling. If you use a very fat rear tire, you should keep the trail as close to 4 inches as possible.
TOO MUCH TRAIL
If the trail is more than 4 inches the bike will handle sluggishly at high speeds. It will seem almost too steady. You will have trouble balancing the bike at lower speeds or on winding roads. It will feel generally sluggish and clumsy.
Google "Rake and Trail" there are many site that have good explanations.
Too little trail will result in the "death wobble" you are experiencing.
TOO LITTLE OR NEGATIVE TRAIL
With too little or negative trail (steering axle mark behind the front axle mark), the bike will handle with unbelievable ease at low speeds, but will be completely out of balance at high speed. It will easily develop a fatal high-speed wobble. EXTREMELY DANGEROUS!
NORMAL TRAIL
Normal trail is somewhere between 2 and 4 inches. The bike will handle easily at both high and low speeds. Flowing smoothly through curves without swaying or wobbling. If you use a very fat rear tire, you should keep the trail as close to 4 inches as possible.
TOO MUCH TRAIL
If the trail is more than 4 inches the bike will handle sluggishly at high speeds. It will seem almost too steady. You will have trouble balancing the bike at lower speeds or on winding roads. It will feel generally sluggish and clumsy.
Last edited by lowriderrob; 07-23-2011 at 05:28 PM. Reason: added text
#14
07-23-2011, 09:36 PM
Bikerlaw, Since the geometry of the bike's original stance has been altered, have you re-checked the trail of the front wheel?
Google "Rake and Trail" there are many site that have good explanations.
Too little trail will result in the "death wobble" you are experiencing.
TOO LITTLE OR NEGATIVE TRAIL
With too little or negative trail (steering axle mark behind the front axle mark), the bike will handle with unbelievable ease at low speeds, but will be completely out of balance at high speed. It will easily develop a fatal high-speed wobble. EXTREMELY DANGEROUS!
NORMAL TRAIL
Normal trail is somewhere between 2 and 4 inches. The bike will handle easily at both high and low speeds. Flowing smoothly through curves without swaying or wobbling. If you use a very fat rear tire, you should keep the trail as close to 4 inches as possible.
TOO MUCH TRAIL
If the trail is more than 4 inches the bike will handle sluggishly at high speeds. It will seem almost too steady. You will have trouble balancing the bike at lower speeds or on winding roads. It will feel generally sluggish and clumsy.
Google "Rake and Trail" there are many site that have good explanations.
Too little trail will result in the "death wobble" you are experiencing.
TOO LITTLE OR NEGATIVE TRAIL
With too little or negative trail (steering axle mark behind the front axle mark), the bike will handle with unbelievable ease at low speeds, but will be completely out of balance at high speed. It will easily develop a fatal high-speed wobble. EXTREMELY DANGEROUS!
NORMAL TRAIL
Normal trail is somewhere between 2 and 4 inches. The bike will handle easily at both high and low speeds. Flowing smoothly through curves without swaying or wobbling. If you use a very fat rear tire, you should keep the trail as close to 4 inches as possible.
TOO MUCH TRAIL
If the trail is more than 4 inches the bike will handle sluggishly at high speeds. It will seem almost too steady. You will have trouble balancing the bike at lower speeds or on winding roads. It will feel generally sluggish and clumsy.
#15
07-23-2011, 10:13 PM
Thanks guys. A couple years ago when I installed the first Springer, I did a trail check based on the RB racing sites instructions. I had the wife hold up the bike and we used a plumb bob and a yardstick. I don't remember the numbers now, but depending on were we took the measurements, it was well within the 4 to 6 inch range (if memory serves). The thing is, the bike has had this issue with all four front ends that I have had on the bike. The stock raked Low Rider forks, 0 degree Wide Glide forks, a DNA Springer and the current Paughco Springer. Didn't matter which one, they all had some sense of the Dyna wobble. Its never been life threatening, but it has been pretty annoying. The best its ever been is the way it is now, with the True Track and the Paughco Springer. I just noticed a real slight wiggle yesterday when I pushed the bike hard over 80 mph. Most of the info I have gathered suggests this is a pretty common problem with pre 09 Dyna's as they age. Right now I am pretty happy with the bike, I am just a bit of a worry wort and am concerned that maybe the apes are feeding into my paranoia. Like I mentioned, the bikes pretty stable right now, I'm the one whose not too stable. 
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Last edited by bikerlaw; 07-23-2011 at 10:15 PM.
#16
07-23-2011, 11:38 PM
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