JKUR, 35' Nitto Ridgegrapplers to 37" Milestar Patagonia M/T? - Jeep Wrangler Forum
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Old 11-11-2019, 05:12 PM
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Question JKUR, 35' Nitto Ridgegrapplers to 37" Milestar Patagonia M/T?

I am shopping for a new set of tires for my 17" JKUR Hard Rock. I am running a 3" lift with TF Outback springs and Falcon 3.3s + flat fenders.

TO my understanding, when going up in size its the rotational weight that puts the most stress on things. While researching tire weights I noticed that the 37" Patagonia are actually about a pound lighter than my 35 Nitto Ridge Grappler:

- 35" Nitto Ridge Grappler : 72.95 lbs
- 35" Milestar Patagonia M/T: 67.92 lbs
- 37" Milestar Patagonia M/T: 71.30 lbs

The rig is on 17" AEV Salta wheels which are 33 lbs ea ( Coming from road racing background that's crazy heavy! I wish Enkei or Volk made wheels to fit the jeep)

My rig is more of an overland build ( which spends 97% of driving on the pavement - living in chicago sucks) , I never considered going up to 37"s but the TF lift and the flat fenders make the 35s look tiny. I am also a bit worried about about hwy driving on the 37"s and needing to re-gear.

While 35" Patagonia is the "right" choice in tems of rotational mass savings, I can't seem to ponder about the 37" considering the rotational mass of the set up will be the same as what is on the rig.

Thoughts?

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Old 11-11-2019, 05:48 PM   #2
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Not only do you have to consider the MOI (moment of inertia or what you are referring to as rotational mass), but you are also losing mechanical advantage due to the taller tire. These are separate (but related) things and will have a cumulative effect on acceleration and braking performance.

The leverage can be corrected by regearing, and the MOI can be mitigated by gearing a little lower than the perfect 1:1 regear would suggest. You still would have lower brake performance than the 35s, but that can also be fixed with brake upgrades.

Moral of the story: If you want 37s, get 37s, but be prepared for other upgrades if you want to maintain your current performance. You are definitely better off with lighter 37s though.

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Old 11-11-2019, 06:33 PM   #3
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Lots to consider besides rotational mass.

Additional traction and more leverage mean more stress on axle shafts, u joints, unit bearings/hubs, etc.

Gearing is a matter of finding a sweet spot. I run 4.56 on a rig I try to keep light, along with a ram type snorkel and aftermarket exhaust, and aftermarket radiator. Still gets pretty hot if I ever travel through the mountains or pull my trailer.

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Auto / 4.56 Gears / ARB Front, Auburn Ected Rear Locker & LSD / G2 Core 44 35 Spline Axles / Alpine 9-Speakers & Sub / MC 3.5" w 6pak shocks / 37" KM3s on Method 105 Beadlocks
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