naturally wired
AZ711
I was recently published on the letters page in a local mag about this weave. Herewith the letter/e-mail...
It may oversimplify the "issue" and then again maybe not!
Well stated write up, but you did say STowners.com
headcase
Thanks. I'm on this if it helps. I have no weave and want to keep it that way since I often find myself in triple digits...
(As a matter of course, on a closed private course, of course)
Rob Hephner
Mobile Pest Control
I'm a little curious if the majority here even understands the difference between a weave and wobble?
They are two different things and caused because of different reasons....
If your ST1300 is weaving only at certain speeds you can bet you are causing it.
If it is wobbling you have the rear weighted too much, so you either need to reduce the weight or increase the spring rate.
They are two different things and caused because of different reasons....
If your ST1300 is weaving only at certain speeds you can bet you are causing it.
If it is wobbling you have the rear weighted too much, so you either need to reduce the weight or increase the spring rate.
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So DOCTOR Rob is stepping in here, huh?
I disagree, weave and wobble are just varying degrees of severity, third (or fourth) level is tank slapper.) Might be weight related, might be bearings, might be tires, might be rider input, might be a combination of all four, or any three, or any two.
Given the different reports 1300 _vs_ 1100, might (probably) some design differences, too.
I disagree, weave and wobble are just varying degrees of severity, third (or fourth) level is tank slapper.) Might be weight related, might be bearings, might be tires, might be rider input, might be a combination of all four, or any three, or any two.
Given the different reports 1300 _vs_ 1100, might (probably) some design differences, too.
Rob Hephner
Mobile Pest Control
Nope, sorry.
http://www.dinamoto.it/DINAMOTO/on-line papers/vibrations/vibmode.html
[Simplified]
A weave is the front end moving around.
A wobble is the rear end moving around and effecting the front end.
[/Simplified]
I didn't invent the terms, but have learned a lot about them in the last 10 months particularly.
http://www.dinamoto.it/DINAMOTO/on-line papers/vibrations/vibmode.html
[Simplified]
A weave is the front end moving around.
A wobble is the rear end moving around and effecting the front end.
[/Simplified]
I didn't invent the terms, but have learned a lot about them in the last 10 months particularly.
naturally wired
Here's a pic of the bar ends....sorry I don't have any close ups right now!
Attachments
http://www.dinamoto.it/DINAMOTO/on-line papers/vibrations/vibmode.html
Neat web site...... too bad I don't speak Italian..
mitch
Neat web site...... too bad I don't speak Italian..
mitch
Marshal_Mercer
Bumbleberry + Crumble = Yum!
Thanks, Rob:
Beautifully done, and perfectly clear. The animation suggests that a steering damper should work wonders on front-end oscillations. There may be a HyperPro unit in my future.
Marshal
Nope, sorry.
http://www.dinamoto.it/DINAMOTO/on-line papers/vibrations/vibmode.html
[Simplified]
A weave is the front end moving around.
A wobble is the rear end moving around and effecting the front end.
[/Simplified]
I didn't invent the terms, but have learned a lot about them in the last 10 months particularly.
Rob, sounds like just the opposite if I am reading the article correctly:The two oscillation modes are:
an oscillation of the front frame around the steering axis called the wobble mode.
an oscillation of the rear frame around the steering axis called the weave mode.
So wobble is front, weave is rear...
Rob Hephner
Mobile Pest Control
LOL, honest to God I have dyslexia and it shows up just like that!
It is mostly why I reference photos.
Go ahead and ask me if you should add or take away preload to reduce sag. I can do it, but almost always screw up saying it.
I should remember a weave is like weaving a basket and wobble is just the front!
It is mostly why I reference photos.
Go ahead and ask me if you should add or take away preload to reduce sag. I can do it, but almost always screw up saying it.
I should remember a weave is like weaving a basket and wobble is just the front!
Right now my OEM B'stones are worn out. The rear is bald, and the front is at the wear bars on the left side. (that left turn and crown thing)
Yesterday I was out for a good ride and several times was above 120 MPH and STILL solid as a rock.
I think a lot of rear shocks out there aren't cranked up enough, unloading the front end.
Then a lot of you put on top boxes (not even offered in the US, must be a reason for this) which adds weight to lift the front and then at speed the air hitting it will unload the front further.
How many of you have gone through the front end setup as seen here:https://www.st-owners.com/forums/showthread.php?t=40003
The whole front end is put on from the crate by the dealer's High School dropouts. Mine wasn't right/torqued correctly, is yours?
Just my thoughts.....Fire away.
Yesterday I was out for a good ride and several times was above 120 MPH and STILL solid as a rock.
I think a lot of rear shocks out there aren't cranked up enough, unloading the front end.
Then a lot of you put on top boxes (not even offered in the US, must be a reason for this) which adds weight to lift the front and then at speed the air hitting it will unload the front further.
How many of you have gone through the front end setup as seen here:https://www.st-owners.com/forums/showthread.php?t=40003
The whole front end is put on from the crate by the dealer's High School dropouts. Mine wasn't right/torqued correctly, is yours?
Just my thoughts.....Fire away.
I still say it's a question of degree. What gives some <Italian> the credentials to define weave versus wobble. I like his "flop" definitions, tho.
The _causes_ (rear wheel, front wheel, tires, bearings, tar pressure, rider input) are all variables that can contribute to an unstable condition. Severity of the condition determines the appropriate descriptive term: Weave (no sweat), Wobble (getting worse), Tank Slapper (OMG!), Flop (it's all over now.)
My opinion.
Still wondering if over-tight steering bearins might contribute to the problem.
The _causes_ (rear wheel, front wheel, tires, bearings, tar pressure, rider input) are all variables that can contribute to an unstable condition. Severity of the condition determines the appropriate descriptive term: Weave (no sweat), Wobble (getting worse), Tank Slapper (OMG!), Flop (it's all over now.)
My opinion.
Still wondering if over-tight steering bearins might contribute to the problem.
Re: Another high speed wobble accident
Sorry but I'm particularly slow to-day...Please explain:
Well stated write up, but you did say STowners.com
Sorry but I'm particularly slow to-day...Please explain
:AZ711
Re: Another high speed wobble accident
ST-owners.com vs. STowners.com
Sorry but I'm particularly slow to-day...Please explain
ST-owners.com vs. STowners.com
Still wondering if over-tight steering bearins might contribute to the problem.. geo
Well if you read Ravens comments it would be the same thing as holding the bars too tight. Tight bearings would be like the preverbial death grip, yes???
mitch
Well if you read Ravens comments it would be the same thing as holding the bars too tight. Tight bearings would be like the preverbial death grip, yes???
mitch
Raven
"two wrecks" - RIP ACL
Re: Another high speed wobble accident
All I can say is AH as opposed to -AH-
ST-owners.com vs. STowners.com
All I can say is AH as opposed to -AH-
Cosmo
I had my ST for about five minutes before I felt the ?squirrellys?; not sure whether it was weave or wobble (dyslexic too!) It felt as though the back wheel was driving back and forth out of line, AND it was speed sensitive. Maybe someone could tell me which it was.
I was driving it home on an interstate run of about 100 miles with some crosswind and a lot of semis. I wrote it off as dirty conditions until I felt it again on a clear day with no semis. I then played with the preload and strut sensitivity and seemed to diminish it. Otherwise the bike is stock and needs new tires. This morning I had it up to 100 in nasty real-winter like conditions (cold, dirty and gusty winds) and felt nothing. I?m hoping never to see its ugly head again.
Just my two cents, but clearly the problem described here is multi-facetted. There seems to be weave, wobble, and other problems that affect the quality of ride. For those who have not experienced it, count your blessings?