Have you ever developed cracks around your nipples?

160 seems to be enough, especially if you are moderately fast. I would expect wheel bearings to have been replaced at least once by now too.

Definitely wouldn't ride on those again. Looks like time for new rims and spokes 

You've had your money's worth. 

I was expecting someone SO different than what I got. What a relief.

Get some new wheels lol.

Maybe a defect rim, or just worn out.

Only time that has happened for me on newer rims has been when holes turned out to no be drilled with correct angle.

That looks like crazing. This can happen to anodized aluminum from mechanical stress. I seriously doubt those “cracks” are any deeper than the anodized layer and I seriously doubt that wheel is at risk of exploding. At 160 hours those wheels have been through some serious stress from flexing. One of the many reasons to keep spokes properly torqued. 

Wendy O Williams had this problem figured out back in the 70s. A little electrical tape on the nipples will prevent the cracking.

Thank you for making me smile today haha

Scratch them with a scribe or something to see how deep they go, they're likely toast anyways

It's crazy the rims are cracked, but there is hardly any tire scrub.

What's the inside of the rim look like?

looks like a front. A lot less scrub happens up there.

I'm impressed you got 160 hours on a wheel set. I don't think I get more than 50 before they lose their shape lol

Cracked nipples and a rimjob. Thread seems borderline NSFW.

Time for new rims

i had a rear that had similar cracks, plus a good crack at the weld joint. Swapped out the rim and spokes, hung the old stuff on a hook in the shop. About a year later, I heard a noise from the shop, went out and found the rim had broken at the seam and jumped off the wall! About a 3 inch gap where the weld had been. I think rims are under a lot more stress than we think..

I was so reluctant to click on this thread. 

Some people use band-aids or tape to prevent nipple cracking I believe. 

Seriously those rims are shot. Any chance the spokes were over-tightened causing added stress?  I've never threaded a rim before but I always watched my Dad do it and it was damn near surgical how meticulous you have to be going around adjusting those things to be just right and balanced. 

Did you properly lube your nipples when you inserted them? Is so what lube did you use?

why yes, yes  i have,  bag balm worked wonders … however, for some reason i feel like we might be talking about two different things! 😂

Surely I'm not the only one who checked my tits while the thread loaded....

I use duct tape on mine....oh wait.

How tight do you torque the nipples to? I think the Yamaha manual specs ~25 in/lbs, which is a lot less than people think they need.

I've seen nice nipples around my crack. Does that count? 

 Wendy 'O for the win here, I personally got a facefull of her nipple in the mosh pit at a Plasmatics show Boulder theatre 1980? Not one crack to be found, Richie Stotts the guitar player wore a mini skirt and a blue mohawk now thats a crackpot.

yours might be a little too mild for the rigors of motocross plus this is multi use can even balm your bag

Lol, cracked nipples