MadMike
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posted August 04, 2003 03:24 PM
RC Comp users!!!! IMPORTANT information!!!!
I just wanted to let everyone using RC Components Rims about a very serious and potentially dangerous flaw in matching the left axel collet to the cush drive bearing! Well last week I received my ceramic wheel bearings and had them put in. while putting the rim on I heard a slight pop sound? spun the rim and everything was fine, when I got to the track on Saturday morning and unloaded the bike everything seemed fine, warmed it up riding around the pits a little and everything was fine, Well on my first pass of the day, I launched and felt the chain click a couple of times, then the bike just felt like a slug going down the track. At the trailer, I noticed the cushdrive was almost completely out of the rim and had ground about a 1/4 of an inch into the swing arm. Upon removal of the rim the entire bearing was completely trashed. And the cush drive was a complete loss. I left and headed to "DWB"'s house to work on it and borrow his wheel if possible. I started evaluating what could have happened (I have to do this at work if we have something fail) as I picked and sorted through what was left, I started comparing it to the OEM wheel, it was obvious the bearing had just failed, but why? Everyone that I spoke to about it felt that the bearing was installed incorrectly, but I checked it out very very carefully before hand so I did not believe that to be true. And then I started lining up the parts on the axle and I saw it! While looking at the OEM cushdrive and the RC drive I noticed the bearings were different. The OEM drive has a bearing that is open and then a sleeve pressed into for the axel to slide through. Where in turn the collet is cut out to hit the bearing and not hit the sleeve on the inside. well on the RC cush drive it uses a standard bearing that goes right up to the axel. So when you put the axel spacer/collet next to the bearing it is barely pressing on the inner portion of the bearing, where it should be totally riding on that surface. Also the outer diam. of the collet is applying pressure to the balls of the wheel bearing. Which I assume is what cracked my ceramic bearings which in turn failed on the launch. I am having a friend of mine build a new wheel spacer that will match up correct, and I am in no way bashing RC Rims, I love them and once this is fixed will be using them for quite a while. This is just a very dangerous situation, IMHO, and I wanted to let anyone that had a set on their 12 to at least take a look and make sure you don't have any wear on your cushdrive bearing. I will post some pictures tonight.
Mad Mike
   
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posted August 04, 2003 03:38 PM
I thought steve had a similar problem with the bearings on his RC Comp wheels...and the fix was to install two bearings on the left side. *shrug...perhaps he can clear it up better than I.
Sucks man
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TurboBlew
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posted August 04, 2003 04:06 PM
Mike... I dont know what generation cush drive you have... but on the newer wheels the bearing is sunk closer to the middle of the cush drive.
You can call one of the sales reps at RC and they'll gladly replace your cush if its an older one.
With higher hp bikes and 1.50 or better 60fts I ALWAYS recommend 2 bearings in the cush assembly. I can give you the details in an email of a fix for the cush. You do have to watch the cush rubbers closely on a race bike.
A few high hp Busas were having a similar issue. The cush needs 2 bearings.
I had issues at DG1 with my wheels gobbling up bearings almost every tire change. Even meticulously installed...the problem still existed.
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MadMike
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posted August 04, 2003 04:16 PM
thanks please email me
madmike1209@mchsi.com
even though that would help I am sure, the outer spacer is wrong and does not mesh up correctly.
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ninja12
Needs a job
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posted August 04, 2003 06:13 PM
Turbo
Please email me the fix also.
gerard_rr@yahoo.com
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MadMike
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posted August 04, 2003 06:58 PM
 Edited By: MadMike on 5 Aug 2003 15:42
here is one of the photo's
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MadMike
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posted August 04, 2003 07:07 PM
here is another
of the swingarm....
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TurboBlew
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posted August 04, 2003 10:23 PM
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TurboBlew
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posted August 04, 2003 10:29 PM
Edited By: TurboBlew on 4 Aug 2003 23:30
The picture above (#4) imitates whats probably happening to the cush assembly after a hard launch. As you can see....with only 1 bearing in the cush assembly...the bearing gets beat all to hell.
Picture 2 shows the 2 bearing setup installed. In the newer cush drive assemblies...the outer bearing is countersunk some more...but you should still run 2 bearings to bear the load on hard launches.
SBS guys have good luck with this and requires minimal attention.
Just keep an eye on the cush rubbers. 
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TurboBlew
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posted August 05, 2003 03:22 PM
Hey are those the aluminum wheel spacers from Spencer or Schnitz??
I cant believe a steel spacer would disintergrate like that. The aluminum ones are weak. Perhaps the bearing was humped from the get go??
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MadMike
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posted August 05, 2003 09:38 PM
steel.
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MadMike
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posted August 05, 2003 09:47 PM
Oh and I know I posted this earlier. But, I dont see anyway if the setup was correct, how in the hell the cush drive could come out like that under load, Unless the Aluminum spacer inside of the cush drive was flexing. but do you understand what I mean about how the wheel spacer is designed wrong for the RC Cush drive. I will have to do a drawing or something like that. cool. thanks
Mike
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TurboBlew
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posted August 06, 2003 02:45 AM
Mike...that picture exagerates what is happening...but that is how the bearing in the cush gets torn up.
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AnotherRedHead
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posted August 06, 2003 11:27 AM
I have no cush on my RC wheel, which is why I have no problems 
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TurboBlew
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posted August 06, 2003 02:56 PM
Uh huh... we'll see after you make some passes, what the tranny looks like.
99% of SBS racers cant be wrong.
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kcadby
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posted August 06, 2003 05:19 PM
I talked to THE man that does Brock's wheels/hubs/bearings at RC...The second bearing is NEEDED in the cush-drive if you make any power and-or launch extra hard (as TB said)...
Pretty sure I have pictures of THAT hub also 
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oldkawboy
Needs a job
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posted August 06, 2003 07:19 PM
Thanks to Steve (Turboblew) I did this mod and it's working great.
Mike....
I'm glad you got off that "light", you and I know how much worse it could have been. Maybe by your post somebody may save themself a severe problem. Good post.
Dan
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AnotherRedHead
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posted August 06, 2003 07:24 PM
Ive made some passes, and it works fine bro! I dont ride it on the street, dont worry about me I will be fine, no probs with my RCs!
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MadMike
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posted August 06, 2003 09:52 PM
You guys are still missing the point I am trying to make about the wheel spacer! It does Not match the bearings! it is dragging on them and not allowing full rotation with out drag! and the sideload is what cracked my bearings. and Dan I thank god that I got off that light!!! I will show pictures of the new wheel spacer that I am having built. I am talking directly about the ZX12R. is anyone??? else running the ceramic bearings?
Mad Mike
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your car is slow
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posted August 07, 2003 06:29 AM
Carl (blink) was....but he has some different wheels....I do believe his ceramic bearings failed recently too.
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TurboBlew
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posted August 07, 2003 06:21 PM
Red, cool deal man! Give us some times with that turbo 12.
Hey Mike...were they WorldWideBearings that failed????
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MadMike
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posted August 07, 2003 07:06 PM
Yes.
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entropy
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posted August 08, 2003 12:43 AM
this Karl (me) has had WW ceramics for 2? yrs, no problemo.
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ninja12
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posted October 22, 2003 10:48 AM
Are the bearing the same as stock, if not where is the best place to get them?
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ninja12
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posted October 23, 2003 07:01 AM
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