All My Rear Bearings Get Toasted

ok, what am I doing wrong? I have multiple truggies, different brands, but all of them seem to steadily grind up the outer rear bearings in the rear wheel hubs. It seems to me they take a lot thrust back there and I have seen new sets go bad in half a day at the track. I've tried shimming them tight and loose to no avail.
I am not one to let a pesty little problem get the best of me, and am about to make my own rear wheel hubs so I can upsize my bearings. But before I do, I wanted to hear what others have exeperienced and if anyone overcame this issue some other way. Thx all!

[lincpimp]

Do you lube your rear bearing...HAHAHAHAHAHAHAHA. Sorry, I had to say it.

Synthetic grease of some sort may help, something designed for high load and heat, like fullsize car wheel bearing grease. Or never seize?

[lincpimp]

And consider yourself lucky, this guy has some serious rear end issues:

Come on, now. Let me get a legitimate answer before hijacking my thread with butter butt there.
Back to bearings, surely everyone isn't cleaning and re-oiling the bearings every 5 or 6 packs?

[What's_nitro?]

I wonder if it's due to the outer race being dented in or the bearing balls being flattened? Have you ever opened one of the dead bearings to look? If the balls are being flattened maybe some ceramic bearings would help since the ceramic balls do not deform. If it's the outer race then is there some way you could insert a steel ring around the bearing to thicken the outer wall a bit?

[moogenite]

Dusty conditions?

is it only the outside bearing? no problem on the diffs?

Because i used blow much diff bearings, it was very dusty where i drove then.

Are your wheels out of wack? unbalanced wheels may cause failure.

[JERRY2KONE]

Bearing failures are usually caused by one of three reasons.

1) poor intallation
2) no lubrication
3) dirt intrusion, or overloading

Overloading could be from unbalanced equipment, hot equipment to close, or wrong bearing for the job.

What type of bearings are you using?

[JERRY2KONE]

And consider yourself lucky, this guy has some serious rear end issues:


Your a sick puppy James. That is just wrong. What kind of porn are you looking at in your spare time? Pick yourself up a Playboy or a Hustler.

It's always the outer rear bearings which is why I think the thrust load on them is toasting them. I tried ceramics but they toast up as well. Am I the only one who's noticed this issue? That's surprising.....

[swiftneed]

maybe the heat dissipation can be causing the hub to slightly warp causing slight force to maybe squeeze the walls enough to seize the bearing try a new set of hubs maybe metal and put some grease as mentioned above and time when it is happening, if you said multiple truggies same problem maybe something is stripped causing fatique to loosen or you might want to take change the way your installing them.

[E-Revonut]

What kind of vehicle is this on? I Raced my RC8T all last summer with no problems. When I just tore the thing apart the only bearing I had to replace was on the steering post and that was because it was stuck there and when I tried pulling it off it blew apart. What kind of tires are you running? A huge tire will put more load on the bearing if it's even slightly off balance. Are you running offset rims? That will also put more load on the bearings.

I've noticed this on my Jammin's and Casters and read others noticing it on Associated....I run mostly LPR holeshots and crime fighters.
Does the Mugen MBX6T used oversized bearings on the rears or did I misread that somewhere?

[moogenite]

Mugen and Associated have the 15x21x4 bearings on the inside.

outside is same as most other cars, but i've heard many mugen driver say the inside bearing fails often.

I dont see why you'd have issue's with the outside wheel bearing failing other then bad balanced wheels, extremely rough conditions or immense dust.

or you have bent your axles... so they put stress on the bearing... did you check?