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Old 01-16-2014, 09:56 AM   #16
catalina38
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I have worn out quite few sets of 908RRs and the front cant be a little vague and wobble a bit at highway speeds when new but after a few hundred miles it goes away. If by death wobble you mean losing control of the bike and nearly crashing? I've never had anything like that happen and no steering stabilizer on the bike. They are by far my favorite tires for the 990 but I wouldn't recommend them for pavement commuters as there are better choices for that.
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Old 01-16-2014, 12:23 PM   #17
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Originally Posted by catalina38 View Post
I have worn out quite few sets of 908RRs and the front cant be a little vague and wobble a bit at highway speeds when new but after a few hundred miles it goes away. If by death wobble you mean losing control of the bike and nearly crashing? I've never had anything like that happen and no steering stabilizer on the bike. They are by far my favorite tires for the 990 but I wouldn't recommend them for pavement commuters as there are better choices for that.
Nothing so dramatic has happened that I would relate to almost losing control or anything like that. No tank slappers. The death wobble title was just for fun and to get peoples attention.

ben
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Old 01-16-2014, 01:46 PM   #18
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Scientology ?

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Old 01-17-2014, 09:46 AM   #19
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The mother of all tank slappers....

Well, it happened to me this summer.
Riding on the expressway, my tire took a glancing blow off of a chunk of pavement & sent the bike into a very bad 85mph tank slapper. I fought it for a few seconds & could not recover. I did manage to get it to the shoulder before it highsided me at 60mph or so. The black mark is from my bike fishtailing.









I repaired the bike & she now sports a beautiful new black Emig Racing damper & black triple clamps.
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Old 01-17-2014, 10:25 AM   #20
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Well, it happened to me this summer.
Riding on the expressway, my tire took a glancing blow off of a chunk of pavement & sent the bike into a very bad 85mph tank slapper. I fought it for a few seconds & could not recover. I did manage to get it to the shoulder before it highsided me at 60mph or so. The black mark is from my bike fishtailing.









I repaired the bike & she now sports a beautiful new black Emig Racing damper & black triple clamps.
glad you are ok.....

now wait for someone to post up that dampers are not needed and they are only band-aids for a poor suspension set up....
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Old 01-17-2014, 12:41 PM   #21
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glad you are ok.....

now wait for someone to post up that dampers are not needed and they are only band-aids for a poor suspension set up....
Yeah or say it was your fault or some dumb crap like that.

I think that settles it. I'll be ordering a new front tire. Forget trying to make this one work. Now I just need to figure out what tire to order...oh the madness, someone stop the madness...

ben
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Old 01-17-2014, 12:59 PM   #22
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Yeah or say it was your fault or some dumb crap like that.

I think that settles it. I'll be ordering a new front tire. Forget trying to make this one work. Now I just need to figure out what tire to order...oh the madness, someone stop the madness...

ben

On my bike it was the rear 908 causing the wobble, which leads me to suspect the suspension settings - at least in my case.
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Old 01-17-2014, 01:01 PM   #23
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glad you are ok.....

now wait for someone to post up that dampers are not needed and they are only band-aids for a poor suspension set up....
Thanks man. Thankfully I was almost fully geared up, minus the riding pants.

Meh...I used to be somewhat anti-damper myself. Used to be...

The SE is on the edge of being too twitchy, add high speed, worn tires or road debris & she will try to slap.
I still love the bike & wouldn't trade it for anything else.

BTW...I had a worn 908 on the rear & a fairly new 606 on the front.
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Old 01-17-2014, 06:05 PM   #24
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On my bike it was the rear 908 causing the wobble, which leads me to suspect the suspension settings - at least in my case.
How did you come to this conclusion? Only change the rear tire and problem went away?

I know the rear is tall which probably contributes to the front, but really can't see how it can be the cause of the problem.

ben
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Old 01-17-2014, 06:39 PM   #25
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How did you come to this conclusion? Only change the rear tire and problem went away?

I know the rear is tall which probably contributes to the front, but really can't see how it can be the cause of the problem.

ben
Almost. I changed the front 908 to a tkc 80 and still had the wobble although it was not quite so scary when it did happen. Then I changed the rear 908 to a karoo and it was gone. Admittedly the rear 908 was well worn when I replaced the front tire.

I really like the 908 combo for the type of riding I do so especially in the early season. I keep the speed reasonable when I am on the slab.
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Old 01-17-2014, 06:44 PM   #26
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Almost. I changed the front 908 to a tkc 80 and still had the wobble although it was not quite so scary when it did happen. Then I changed the rear 908 to a karoo and it was gone. Admittedly the rear 908 was well worn when I replaced the front tire.

I really like the 908 combo for the type of riding I do so especially in the early season. I keep the speed reasonable when I am on the slab.
Would be interesting if anyone ever tried changing the rear tire first and the wobble went away and they could keep the 908 front.

ben
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Old 01-17-2014, 07:06 PM   #27
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The solution is called preload.
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Old 01-17-2014, 07:24 PM   #28
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The solution is called preload.
Very insightful.

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Old 01-17-2014, 08:49 PM   #29
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I don't think there is any ONE thing that causes the wobble. I've done some internet searching and have found many Scientific papers on the subject. Here are a few:

http://www3.imperial.ac.uk/pls/porta...1/35343696.PDF

http://www3.ic.ac.uk/pls/portallive/docs/1/50172.PDF

http://www.researchgate.net/publicat...cycle_Dynamics

I found that once I decreased the pre-load in the rear and increased the front that my "Wobble" decreased dramatically. But I also have 2000miles on my 908s, so that could be a factor.
I want adjust the forks. Because one of the papers I read (I forgot which) said that an increase in fork length decreased wobble.
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Old 01-18-2014, 08:44 AM   #30
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Yeah or say it was your fault or some dumb crap like that.

I think that settles it. I'll be ordering a new front tire. Forget trying to make this one work. Now I just need to figure out what tire to order...oh the madness, someone stop the madness...

ben
Any of you that are tossing your 908s I would be glad to take them off your hands
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