15" Wheels and 30" tires on your Patriot (no spacers): Test Fit Results

Discount Tire · Mar 24, 2015

rcguymike said:
Hmmm...Brings me to a question. I have BFG KM2's in the now discontinued size 215/75-r15 on the 15x7 soft 8 wheel. The combined weight of one is ~62.2lbs. Would "upgrading" to the 15x7 Punch wheel make much of a difference since the weight is further towards the center? Also how do the non-steel wheels hold up offroad? Do they take hits from rocks and such well? I did this to my old 16" steel rims:

There are pros and cons to both and it really depends on how you use your rig. Some will argue that steel wheels tend to bend under extreme forces (can be bent back) where aluminum wheels tend to break/crack. I personally prefer aluminum wheels for the weight savings since my rig sees mainly daily duty with some moderate off-road mixed in. I haven't had any issues with my wheels (Level 8 ZX) off-road. All my coworkers also run aluminum wheels on their rigs without issue. A 12lb savings in weight per corner is pretty significant. If your Patriot is used for daily driving with moderate off-road mixed in like me, you may want to consider going with aluminum wheels. If it's primarily used off-road with rock crawling thrown in, steel may be the better option.

Circling back to your tires... There have been rumors about the KM2 being discontinued. This is not the case... BFG is making changes to most of their KM2 molds (not sure what these changes are unfortunately), which requires them to generate new part numbers, hence discontinuing the old part numbers. The 215/75R-15 KM2 was included in the mold change and the replacement, or updated version, is now available.

Details: http://www.discounttiredirect.com/d...tm_medium=textlink&utm_campaign=branding_informational&utm_term=jeeppatriot.com

silverflash said:
So i would want to stick with one of the lighter options. 17lbs. That and a mild AT tire would work i think for me. Do I have to worry about anything additionally that will cause issues with bearing wear etc? Backspacing etc?? I don't know a whole lot about the mechanics of the wheels and backspacing etc so forgive me. Would any discount tire be able to get me a set of the 17 pounders above with a decent at tire where the combo would weight around 46 lbs or less? Looks like an AT tire size 225/75/15 in something mildy aggressive would work for me? I saw firestone destinations AT and kumho AT's..those tires weigh like 29/30 lbs i believe. I don't want the heavier tires. Thoughts?

silverflash said:
Will 225/75-15 fit on stock fd1 with no mods or pinch weld mods?? It looks like they should right?

Absolutely, anyone of our local stores would be happy to set you up

Just bear in mind their system will not show 15" wheels fitting your application so you'll need to tell them exactly which wheel model you want to order.

We do not sell Firestone tires but we can order a set of KL-78 tires for you. This semi-aggressive A/T model model weighs 29lbs and is an excellent option for daily driving duty with light to moderate off-road use.

As far as the overall fitment goes with 225/75R-15 tires, they'll likely clear without modifications but not every single Patriot is the same coming off the assembly line and not all tire brands run the same in size. That being said, you may (stress may) have to perform the PWM.

rcguymike · Mar 24, 2015

Sandstone said:
Reducing the mass of the rim 12lbs should take about 40% less power to move and 40% less effort to stop. I'd think it would be noticeable.

rcguymike said:
Just curious how you come up with that number. I know from physics that the further from the center of the tire that the mass is the more effect it has(pretty sure finding the solution actually involves some calculus). Wonder if there's an online calculator to figure this out, but I'm too lazy right now, maybe tomorrow.

Interesting if you like physics: https://www.physicsforums.com/threads/calculating-torque-hp-losses-from-wheel-choices.334984/

Didn't go as far as I wanted but looks like just the weight savings might be worth it after a while. Wonder if those fake rock rings could be beefed up?

rcguymike · Mar 24, 2015

Discount Tire said:
There are pros and cons to both and it really depends on how you use your rig. Some will argue that steel wheels tend to bend under extreme forces (can be bent back) where aluminum wheels tend to break/crack. I personally prefer aluminum wheels for the weight savings since my rig sees mainly daily duty with some moderate off-road mixed in. I haven't had any issues with my wheels (Level 8 ZX) off-road. All my coworkers also run aluminum wheels on their rigs without issue. A 12lb savings in weight per corner is pretty significant. If your Patriot is used for daily driving with moderate off-road mixed in like me, you may want to consider going with aluminum wheels. If it's primarily used off-road with rock crawling thrown in, steel may be the better option.

Circling back to your tires... There have been rumors about the KM2 being discontinued. This is not the case... BFG is making changes to most of their KM2 molds (not sure what these changes are unfortunately), which requires them to generate new part numbers, hence discontinuing the old part numbers. The 215/75R-15 KM2 was included in the mold change and the replacement, or updated version, is now available.

Details: http://www.discounttiredirect.com/d...tm_medium=textlink&utm_campaign=branding_informational&utm_term=jeeppatriot.com

Awesome! Thanks a bunch. Depending where my MPG goes over the course of the tires(or if I still have my Patriot when they're done) I may get them again(interested in the KO2's as well now). I thought the demand for the smaller sizes was so low they decided to stop making just the smaller sizes.

Just wish I'd have thought about weight before I just went with the cheapest 15's.

I'll be around the Traverse City area at least 2 or 3 times this year so I might have to call and order them up by phone and stop in. Does discount do free tire mounting for a swap or buy back used rims

?

Jeeperitis · Mar 24, 2015

Wheel and tire weights..

...I finally got batteries for our digital weigh scale.

My General Grabbers A/T2's @ 235/70/16 in combination with the 16x8 Pro Comp alloy's 7032 weigh 59lbs. 9lbs per corner over stock, I still get great fuel economy on the highway,and if there is a difference in acceleration and braking(and I assume there probably is)...I don't notice it...my riot feels as before in those category's...but the ride feels better,sitting up higher,nicer over bumps..just feels and handles better.

Sandstone · Mar 24, 2015

rcguymike said:
Interesting if you like physics: https://www.physicsforums.com/threads/calculating-torque-hp-losses-from-wheel-choices.334984/

Didn't go as far as I wanted but looks like just the weight savings might be worth it after a while.

Dropping some weight can't hurt. Especially with the taller gearing of the FDI CVT and the added load of the bumpers. And then there's that whole unsprung weight wear-and-tear thing...

As for what I said earlier, it may not be exactly 40%, but dropping from 29lbs down to 17 means that you have to put a lot less energy into the wheel to make it spin, which means there is less energy to remove to stop it. Maybe you were thinking of where you multiply by the square of the distance when the radius changes, but you don't have to do that since the tire diameter and the rim size stays the same, only the weight of the rim changes.

rcguymike · Mar 24, 2015

Sandstone said:
Dropping some weight can't hurt. Especially with the taller gearing of the FDI CVT and the added load of the bumpers.

As for what I said earlier, it may not be exactly 40%, but dropping from 29lbs down to 17 means that you have to put a lot less energy into the wheel to make it spin, which means there is less energy to remove to stop it. Maybe you were thinking of where you multiply by the square of the distance when the radius changes, but you don't have to do that since the tire diameter and the rim size stays the same, only the weight of the rim changes.

I was just hoping you weren't factoring the whole weight of the tire as weight at the outside diameter has a lot more effect than weight further towards the center(which is where the square of the distance comes into play).

Tyler-98-W68 · Mar 24, 2015

This is getting wayyyy too technical............light wheels and tires = better all around performance on the MK platform =)

rcguymike · Mar 24, 2015

Tyler-98-W68 said:
This is getting wayyyy too technical............light wheels and tires = better all around performance on the MK platform =)

True. I was just trying to do a Cost/Benefit analysis for buying new ones when I already had some...

Discount Tire · Mar 24, 2015

rcguymike said:
Awesome! Thanks a bunch. Depending where my MPG goes over the course of the tires(or if I still have my Patriot when they're done) I may get them again(interested in the KO2's as well now). I thought the demand for the smaller sizes was so low they decided to stop making just the smaller sizes.

Just wish I'd have thought about weight before I just went with the cheapest 15's.

I'll be around the Traverse City area at least 2 or 3 times this year so I might have to call and order them up by phone and stop in. Does discount do free tire mounting for a swap or buy back used rims?

Glad we could help!

We may be able to offer you some trade-in credit on the wheels depending on their condition and the demand for those particular wheels in that area. As far as swapping the tires go, this isn't free, but I'm sure we can work something out with you

I suggest you reach out to our Traverse City location for further details.

Vroomchu · Mar 25, 2015

Heirio said:
Looks good Vroom! Have you noticed any rubbing during compression? It looks like the tire might be rubbing some on the spring.

I haven't tried to flex it out yet but I'm guessing I will get a little rub.
I'll let you know as soon as my favorite loading dock is free of snow banks.

Tyler-98-W68 · Mar 25, 2015

Vroomchu said:
I haven't tried to flex it out yet but I'm guessing I will get a little rub.
I'll let you know as soon as my favorite loading dock is free of snow banks.

235/75/15 With MB Chaos 5 Wheels don't rub during any flexing and that is with the front swaybar off.

silverflash · Mar 26, 2015

thinking about getting 15x7 MB TKO and 225/75-15 kumho tl78's.

any issues here with the dealer denying me warranty coverage for wheel bearings/transmission/axles etc?

it's slightly wider tire, 8.8 versus 8.5 " and slightly taller, 28.3" versus 28". That is a 1% change in height and 3% change is width.

Also, the whole combo will be a pound lighter or so. I would think it should all be same as the stock 17" rim/tire combo in terms of stresses on the suspension and drivetrain?

any concerns regarding warranty?

rcguymike · Mar 26, 2015

silverflash said:
thinking about getting 15x7 MB TKO and 225/75-15 kumho tl78's.

any issues here with the dealer denying me warranty coverage for wheel bearings/transmission/axles etc?

it's slightly wider tire, 8.8 versus 8.5 " and slightly taller, 28.3" versus 28". That is a 1% change.

Also, the whole combo will be a pound lighter or so.

any concerns regarding warranty?

Highly doubt it. You can always ask them. The only concern would be if you went really big and your odometer was off, but .3" might not even need to be adjusted for, might be close enough.

Sandstone · Mar 26, 2015

silverflash said:
thinking about getting 15x7 MB TKO and 225/75-15 kumho tl78's.

any issues here with the dealer denying me warranty coverage for wheel bearings/transmission/axles etc?

it's slightly wider tire, 8.8 versus 8.5 " and slightly taller, 28.3" versus 28". That is a 1% change in height and 3% change is width.

Also, the whole combo will be a pound lighter or so. I would think it should all be same as the stock 17" rim/tire combo in terms of stresses on the suspension and drivetrain?

any concerns regarding warranty?

No reasonable dealer would give you any trouble over it.

silverflash · Mar 26, 2015

rcguymike said:
Highly doubt it. You can always ask them. The only concern would be if you went really big and your odometer was off, but .3" might not even need to be adjusted for, might be close enough.

when driving with my current stock wheel and tire setup, the gps says 61 when the odo says 60. So it's off a hair anyways. it will be off just another hair. right?

Tyler-98-W68 · Mar 26, 2015

I"ve never had the speedo reprogrammed for any of the plus size tires and wheels I've ran, zero issues, just have to adjust your driving habit and you won't get caught speeding.

silverflash · Mar 30, 2015

So can I expect wheel bearing and axle troubles going from the stock 17" to the Mb tko with kumho 225/75r15?? The new wheel and tire assembly would be 46lbs (17 for wheel and 29 for tire ) as opposed to about 49lbs stock (28 lbs for sra wranglers and 20/21 lbs for the stock alloys 17" wheels. I understand the stock backspace to be 5.25" and the Mb tko has 4". That's a difference of 1.25". Does that mean the tire/rim combo will stick out 1.25"?? Will the combos being lighter offset that extra 1.25" distance? I did some basic calculations and if the backspace was identical between the old and the proposed rim, less torque is required for the wheel to turn. I forget from physics how to calculate the force with the addition of the 1.25" lever. Thoughts or am I overtjinking? If it means my wheel bearing need changed at 100k miles versus 120k miles I am fine with that. Is my thinking correct when it comes to how far the new combo will stick out? Am I missing something else in regards to the rims design that may reduce that such as offset?? I don't know alot about wheel and tire stuff. Fyi. Thanks!

Sandstone · Mar 30, 2015

I don't think you'll be making things any worse as far as wheel bearings and axles.

Here's a tire/rim size comparator that you can use to see the differences between one set and the other. Gives some pretty good details.

http://rimsntires.com/specspro.jsp

silverflash · Mar 30, 2015

Sandstone said:
I don't think you'll be making things any worse as far as wheel bearings and axles.

Here's a tire/rim size comparator that you can use to see the differences between one set and the other. Gives some pretty good details.

http://rimsntires.com/specspro.jsp

what are the specs on your ravine rims? offset? backspace?? spacers???

Sandstone · Mar 30, 2015

silverflash said:
what are the specs on your ravine rims? offset? backspace?? spacers???

15x8, 25mm offset, 5.5" backspace, no spacers.

15" Wheels and 30" tires on your Patriot (no spacers): Test Fit Results

Discount Tire

rcguymike

rcguymike

Jeeperitis

Attachments

Sandstone

rcguymike

Tyler-98-W68

rcguymike

Discount Tire

Vroomchu

Tyler-98-W68

silverflash

rcguymike

Sandstone

silverflash

Tyler-98-W68

silverflash

Sandstone

silverflash

Sandstone

Top Contributors this Month

Recommended Communities