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Old 02-09-2015, 08:47 AM   #1
whitham_wannabe OP
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Gentlemen, check yer nuts.

So this happened yesterday. And before anyone mentions the state of my chain, it was freshly lubed before I left for the day!


My guess is that one or more of the bolts holding the sprocket on came loose, or was left loose, and catastrophic failure was the result. I put this sprocket on about 14 thousand miles ago, so it seems strange that it would take this long to work itself free. The dealership put a new bearing in a month ago, but I doubt they would have taken the sprocket off to do that.



Earlier in the day, I had noticed a strange 'ticking' noise on first take up, and had done a quick roadside inspection. I didn't pick up anything being amiss, even from having it up on the center stand spinning the back wheel.

So the question is ... do I repair the steaming pile of shite that is the stock BMW wheels or use this as a VERY poor excuse to get a set from Woodys?

Good times ...!

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Old 02-09-2015, 09:07 AM   #2
FJRCraig
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Saw the rear brake disc on a 1200rt do something similar. It locked the rear wheel (thankfully at low speed).

You were lucky!
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Old 02-09-2015, 10:30 AM   #3
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Oh yeah, you can fix that. Just get some JB weld and......
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Old 02-09-2015, 11:54 AM   #4
97707
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Not repairable

Is it under warranty?

Not sure if a wheel would be considered a "wear item". Looks like its been used hard. But then a $12K so called adventure bike ought to stand up to some hard use.

Seems you need to replace it with something more durable.


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Old 02-09-2015, 12:55 PM   #5
Bayner
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There's different diameter holes, I think 8mm or 10mm available on the sprockets. Any chance you inadvertently got the wrong size?
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Old 02-09-2015, 03:59 PM   #6
RvGS
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Yep Note what Bayner ^said.

I experienced as well that BMW has changed for model BMW F 800 GS 2008-2010 the bolting size; some have 10.5 mm and other 8.5 mm...
So be sure you have the right sprocket correspondingly bolt size.

Managed to get aprox 500km with them until this happend;



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Old 02-09-2015, 04:31 PM   #7
Kiwi Tinkerer
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Moaners

"it's a piece of shit wheel...blah blah.."
Just because you did not do your maintenance?

Mechanical devices require maintenance, Especially when ridden hard.

So bmw redesigned it. Isn't that good?
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Old 02-09-2015, 05:12 PM   #8
sarathmenon
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Not to mention, there is a sprocket carrier used on fleabay right now, for less than 100 shipped. Much more cheaper and bolt on rather than trying to change the entire wheel.
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Old 02-09-2015, 06:27 PM   #9
machinebuilder
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Why change the wheel? It's the sprocket carrier that's broken.


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Old 02-09-2015, 06:56 PM   #10
Snowy
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Quote:
Originally Posted by Kiwi Tinkerer View Post
"it's a piece of shit wheel...blah blah.."
Just because you did not do your maintenance?

Mechanical devices require maintenance, Especially when ridden hard.

So bmw redesigned it. Isn't that good?
Well....they aren't exactly A-grade. His is actually now a steaming pile of shit.


As excuses go...why not? It's his money.


The bike shop I order my rear sprockets through always asks what size hole they are because there are 2, and never being able to remember I always say "order the small hole version, because it's a lot easier to drill out a small hole than put the metal back into a large one".

Quality bolts, Loctite, make sure they're tight. No problems so far (75,000km). But then, I've never had something like that come loose and destroy itself. Attention to detail was beaten into me.

They may not be A-grade off road wheels, but they will take a pounding. My front is a bit wobbly. It looked damn near octagonal at one stage. I just keep beating out the dings. So far so good.

I'm actually quite surprised, and a little bit chuffed, that it's lasted this long.

But changing the front forks dramatically limited the damage the front wheel was getting.
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Old 02-09-2015, 11:56 PM   #11
whitham_wannabe OP
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Quote:
Originally Posted by sarathmenon View Post
Not to mention, there is a sprocket carrier used on fleabay right now, for less than 100 shipped. Much more cheaper and bolt on rather than trying to change the entire wheel.
Got a link? Couldn't find anything when I looked earlier.

As far as bad maintenance, that was the point of the thread - I never check these bolts between changes, so I was suggesting others learn from my mistakes. This time round I will probably just lockwire the buggers and be done with it.

The 'steaming pile' comment was a little tongue in cheek (but only a little), with all the bad comments that these wheels garner (soft rims, bad bearings etc). That said a set of woodys is always going to be huge upgrade, to any bike. Called today, 4 week lead time is too long so this will need to be repaired.

70k hard miles, so no warranty claim, just fix it and carry on.
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Old 02-10-2015, 06:31 AM   #12
Reaver
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I was hoping you were kidding somewhat since this is such a rare failure. The Dealer wouldn't touch the sprocket for bearing replacement but surely, hopefully would have noticed a loose bolt or two at that time.

Keep in mind an F800R carrier is the same PN for Ebay searching. I keep a new R carrier as a spare, it was a lot cheaper not being labelled GS.
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Old 02-10-2015, 08:25 AM   #13
JRWooden
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Just as a note:

1) the mating surfaces between sprocket and carrier need to be super-clean ... no grit

2) IIRC the sprocket bolts are TTA (Torque to Angle)

3) Manual says the nuts are single-use nuts and are mechanically deformed
(not factory applied locktitie)

Reaver knows better than I do, but I think #1 and #2 are important,
reusing the nuts existing nuts, if not damaged, and applying locktite is probably OK
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Old 02-11-2015, 02:26 PM   #14
EnderTheX
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Quote:
Originally Posted by JRWooden View Post
Just as a note:

1) the mating surfaces between sprocket and carrier need to be super-clean ... no grit

2) IIRC the sprocket bolts are TTA (Torque to Angle)

3) Manual says the nuts are single-use nuts and are mechanically deformed
(not factory applied locktitie)

Reaver knows better than I do, but I think #1 and #2 are important,
reusing the nuts existing nuts, if not damaged, and applying locktite is probably OK
The nuts are labeled as single use but probably can go another round if you don't have any to put back on. I found them at my local hardware store and didn't even have to go to BMW.
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Old 02-11-2015, 07:44 PM   #15
Bayner
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I've reused mine for 100k worth of sprocket changes. I use a little blue locktite just to make sure nothing backs off. Just employ some common sense when deciding for yourself.
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