Ahmet

Last thing I want to do is get in a discussion over IMS bearings with people over the internet but there can be many reasons for redesigning a piece, including (likely in this case) accommodating the quieter/simpler chain drive of the later models. My single row has 165k miles on it.

wyovino

Yes. Many were done before mine and there are many more in use, so the odds on mine being the first to fail are pretty slim. No one knows the lifespan of the beefed up LN bearing, which presumably will last longer than the supposed poorly designed OEM bearing.

I wouldn't take out an insurance policy on my insurance company.

DaveCarrera4

We should start a new thread...How Many Miles on Your Original IMS Bearing??? I'm at 90K and counting...

Flat6 Innovations

Take that bearing apart... Then judge it. Look for corrosive wear on the races and reduced ball diameters/ spalling.

I have yet to see any of these "perfect" bearings that everyone online speaks of... After 221 retrofits being carried out here, to include the VERY FIRST one I haven't seen a perfect bearing extracted as of yet. If the bearing feels fine, take it apart. Don't judge a book by it's cover~

TroyN

I'm going to send you my bearing with the warranty paperwork, so will you take it apart and post results?

BlowHole11

I'm at 139k miles, but am starting to think about getting the bearing done.