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The post is from 2014 !! Hahahha
Don't mean to on your parade, but why would anyone trade 8s for 10s? 8s hold beads incredibly well while 10s throw them like Peyton Manning.
It is impressive how much wider the track on my 4Runner on 10s looks compared to CrankyCrawlers on 8s. We both run 35x12.50 tires. I always think he is still running the narrow width rear axle housing...but he can go to lower pressures without losing a bead. On the last Moab trip I had a malfunctioning air gave so went down a few lbs lower than intended and ended up with a bead leak. It was so low it sounded different running in the sand and gravel. I didn't lose a bead though.
I've done some gnarly wheeling on 8" and never lost a bead. I am a big believer in the difference.
Your MTRs were a higher load rating, right? Mine are and will be "C". I think the MTRs are more like the Toyo with a "D" or "E" rating? That will add to the ability to hold the bead at low air pressure.
Negative my MTRs were a C.
They didn't seem to squat much for the low tire pressure you had the last time we wheeled. I would guess your sidewall were less flexible which isn't necessarily good or bad. I have no doubt that 8s hold a bead better, but I doubt you would have an issue with losing beads running 10s. A lot of it comes back to awareness of the driver. I have never lost one but have pushed to the point of releasing a little air.
I disagree. It is pretty well known that 10s throw a bead much easier. The best analogy is to take a rubber band and stretch it between your two fingers. The closer you get to the edge of your finger tip the closer you are to firing the rubber band. Imagine an 8 as being much closer to the center of your finger tip where as a 10 is closer to the edge. Now take into account outside effects (i.e. obstacles which make it easier for the rubber band to snap).
I have never run the same tire on an 8 inch and 10 inch wheel so can't make a personal comparison. I don't doubt that there is a difference, I know CrankyCrawler can air down a bit lower than me and still be comfortable for a day of wheeling. His truck has a bit less weight and our tires are different so it is hard to isolate any specific factor. Let's just get our air pressures where we want them in Moab and keep the tires rolling!
This will be something that I will have to play with a bit on this trip because I had my KMs pretty dialed in for where I was comfortable running them at with minimal risk of losing air or a bead. I would guess the Coopers can be run a bit lower.
Couldn't speak to it. 8 PSI is a good rule of thumb for 8" rims. I would think 10-12 would be around where you want to be with 10s.
I generally have run right around 10 in Moab because the trips on the road are not too long. I will stay in the 12-14 psi range if I know I will have a long trip home (i.e. Elephant Hill). I have run close to 8 psi without issues, but that's starting to push it. I will probably shoot for 10 psi and see how they squish on the way down.
See I run 6 PSI at Reiter which is wet sharp rock and never lost a bead. A good showing for 8" rims. I don't have to worry about the trip home as I have a c02 tank for airing back up.
That is why I assumed a higher load rating. Your MTRs at 6 psi looked to have less squat than my KMs in the 8-10 psi range. I don't know if you could run the KMs that low with the same success. Between the 37s and what I would assume is a pretty solid sidewall you may be able to go pretty low with the PBRs.
I disagree. It is pretty well known that 10s throw a bead much easier........
I think that an 8 inch wheel will almost always hold a bead better than a 10 inch wheel using the same tire. I also think that it is entirely possible for someone to have an 8 inch wheel and tire combination that would lose the bead more easily than a different 10 inch wheel and tire combination. There are a lot of factors in play. The extreme examples are a rim that pulls the bead in from its natural spacing between sidewalls when not mounted and the goofy setups where the sidewall is actually push led way out which relies on air pressure to hold the bead.
so you think a 8" rim would be better on a 35x14.5x15?
It's like deflategate all over again!
whats deflategate?
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