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I plan on running a 225/65/17, I wouldn't go much taller or wider. That tire is an inch taller over stock, the rear wheels being set forward closer to the body is what concerns me
 

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Discussion Starter #6
I plan on running a 225/65/17, I wouldn't go much taller or wider. That tire is an inch taller over stock, the rear wheels being set forward closer to the body is what concerns me


So 225/65/17 is the maximum you can have without any rubbing?
Changing to this taller tire size will void warranty?
And, will this 1” taller tire decrease gas milage a lot or will it be unnoticeable?


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Hernán Grimberg said:
What is the Biggest tire size w/out a lift and without any rubbing that can fit on a 2017+ Jeep Compass?
This question has not yet been very thoroughly evaluated, the 2nd gen Compass just came out last year and very few people change tires right away on a brand new vehicle, so there just isn't a lot of experience yet from others to draw on.

I checked into it a bit early on and mainly what I seemed to find is
1) There is not much room for a larger tire, only a little bit wider and you are in danger of rubbing the strut towers up front and as mentioned in the back the rear tire is awfully far forward in the wheel well, and
2) There is not enough torque in the 2.4 N/A motor to afford losing some of it to turn over a larger tire.

Physics dictate that you will loose performance and gas mileage with any increase in tire height and weight. How much of course depends on how much bigger than stock. I'm not sure on the warranty, we have heard conflicting information about how large a tire can be before it causes you issues in that department. That is yet another reason people tend to run stock-size tires on brand new cars.
 

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Discussion Starter #8
This question has not yet been very thoroughly evaluated, the 2nd gen Compass just came out last year and very few people change tires right away on a brand new vehicle, so there just isn't a lot of experience yet from others to draw on.



I checked into it a bit early on and mainly what I seemed to find is

1) There is not much room for a larger tire, only a little bit wider and you are in danger of rubbing the strut towers up front and as mentioned in the back the rear tire is awfully far forward in the wheel well, and

2) There is not enough torque in the 2.4 N/A motor to afford losing some of it to turn over a larger tire.



Physics dictate that you will loose performance and gas mileage with any increase in tire height and weight. How much of course depends on how much bigger than stock. I'm not sure on the warranty, we have heard conflicting information about how large a tire can be before it causes you issues in that department. That is yet another reason people tend to run stock-size tires on brand new cars.


The Compass Sport can look a lot nicer with a bigger size tire. The wheel well seems a bit tight, that is true.
My question is how much higher you can go, maybe just 1/2” more?


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The Compass Sport can look a lot nicer with a bigger size tire. The wheel well seems a bit tight, that is true.
My question is how much higher you can go, maybe just 1/2” more?


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I'm planning on running 225/70/16's on my Compass Sport. Wrangler SR-A's. They'll be here next week so I'll report back. I don't really anticipate any issues. The wheel wells are massive with the current 215/65/16's.

As for fuel economy, it really depends on your driving habits. If you do a lot of city driving, you'll likely see a bit of a MPG drop off - but really not that noticable. A lot of highway mileage and you likely wont notice at all.

There's plenty of studies on this subject. I can't post links yet or i'd send one over.
 

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Big difference between a 16" and 17" rim. Even with your 16" rim and a 225/70/16 tire it's still 1/2 shorter than a 225/65/17


I'm planning on running 225/70/16's on my Compass Sport. Wrangler SR-A's. They'll be here next week so I'll report back. I don't really anticipate any issues. The wheel wells are massive with the current 215/65/16's.

As for fuel economy, it really depends on your driving habits. If you do a lot of city driving, you'll likely see a bit of a MPG drop off - but really not that noticable. A lot of highway mileage and you likely wont notice at all.

There's plenty of studies on this subject. I can't post links yet or i'd send one over.
 

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What is the Biggest tire size w/out a lift and without any rubbing that can fit on a 2017+ Jeep Compass?

What are you trying to accomplish with changing tire size? What size tires are on the rims stock.

If your looking to increase ground clearance there sadly is not much to be gained. Depending on how your using your Jeep gaining even a little may be worth it. However if your trying to get into a tire size that offers a more aggressive tire selection you might not need to change the tire size very far from stock. As noted we don't have much room to play with as far as clearance with non-lifted new body Compass.

I myself will likely be going to a different tire size on our Trailhawk when the stock tires wear out just so I can get into a more aggressive tire. I have been playing with a tire size calculator and think a 225/65/17 might be the answer.

According to the tire size calculator a 215/65-17 (stock Trailhawk tire) is 28" tall and 8.5" wide the 225/65-17 is 28.5" tall and 8.9" wide. Looking at a speedometer calibration calculator for different size tires shows this tire size will toss the speedo off by 1.1 MPH at 55 MPH So little effect there. I don't feel this will have a noticeable effect on driving dynamics as I have often just bumped up a full inch on tire height on a lot of different vehicles without seeing much if any effect.

If you want to really push tire size to the max your going to have to do some measuring. Measure all clearances with the vehicle on flat level ground wheels straight. Then with wheels turned full lock each direction. Then place the vehicle off chamber on right and left sides stuffing the tires into the wheel wells and measure all clearances. With these numbers in hand you can use an online tire size calculator to break tire sizes down to easier direct measurements to find what will fit with in your measurements. I would allow for some error as not all tire manufacturers end up with the size the tire should be by the math. Some brands might come up a little short and or narrower than what the sidewall numbers reflect. Also some tires have a shoulder design that can offer more clearance than others.

Best of luck and please post what you end up going with as well as how they fit. As pointed out these things are so new we just don't have a lot of data on stuff like this!
 

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Having the 16 inch wheels comes in handy here. Rather have the larger tire wall to fill in the wheel wells as opposed to the larger wheels with less tire wall.

I think the 225/70 for 16's and as mentioned about 225/65 17's are going to be the best bets - with little to no noticable change to performance / fuel economics.

Again, i'll test this out next week and report back for 16 inch wheels. Someone else will have to take the plunge for the 17s.
 

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Having the 16 inch wheels comes in handy here. Rather have the larger tire wall to fill in the wheel wells as opposed to the larger wheels with less tire wall.

I think the 225/70 for 16's and as mentioned about 225/65 17's are going to be the best bets - with little to no noticable change to performance / fuel economics.

Again, i'll test this out next week and report back for 16 inch wheels. Someone else will have to take the plunge for the 17s.

I totally agree for off road use I would rather fill the wheel wells with tire rather than rim. Taller sidewalls give you a flexer tire with better cushion to the rim and room to air down when needed. I wish the Trailhawk was on a 16" rim in fact.

I feel the tire sizes listed are the best way to play it safe and get into a tire size with more tire choices. I also worry for those with the 9 speed auto how it would handle the shift points with a much taller tire on it than stock maybe those with lifts and bigger tires can add some prospective here.

With the 17s swapping the 215/65 to the 225/65 is only costing 1/4 inch of fender space all around so even where the fender is close in the rear it will be fine. I just went out on the hill next to the house and flexed our Trailhawk and I would not be comfortable going up a full inch on tire size with that close fit in the rear wheel well but a half inch would be fine. I worry a little bit about the tiny bit of width increase in the front seems to me looking at it awhile ago the tires are a tight fit in there. But again width will be divided between inside and outside so like.2 inches will likely be ok. But again we need to look at tire shoulder type a square shoulder might get into trouble where a rounded shoulder might clear with room to spare.

For the 16s stock I have listed 215/65-70 which comes up to 27" x 8.9 the 225/70 16 come up as 28.4 x 8.9. So pretty much the same outside as the 225/65-17 you gain around an inch of side wall though which is nice for off roading. However your going to suffer around 3 MPH of speedo reading since your moving up around 1.4 inches in tire size depending on brand so be mindful of that. Given the two swapped tire sizes is near identical on the outside the fit should be good. Thinking about it though one might still want to do some measuring as ours is a Trailhawk which has different part numbers for some of the suspension components. This might help us maintain a bit more clearance in the rear on up travel. So flex it up and look how tight that funky wheel arch in the rear gets.

I'm thinking one of these days we might be able to work up a what fits and what hits thread as we start modding these little Jeeps. smile:
 

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And, do we loose the warranty if we change the tire size?


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I don't know any of us know for sure but my guess and it is only a guess it depends how far out of spec you go. Only a little like half an inch taller a tech would never likely even look at the tire size because this small of a difference would not stick out to the eye. However an inch or more will be pretty noticeable add a lift of course and it becomes something that really stands out.

If you really want to know for sure contact Jeep warranty and ask if they say it will not affect warranty save their communication in case you need it at a later date!
 

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Discussion Starter #17
I don't know any of us know for sure but my guess and it is only a guess it depends how far out of spec you go. Only a little like half an inch taller a tech would never likely even look at the tire size because this small of a difference would not stick out to the eye. However an inch or more will be pretty noticeable add a lift of course and it becomes something that really stands out.



If you really want to know for sure contact Jeep warranty and ask if they say it will not affect warranty save their communication in case you need it at a later date!


Well, most lilkely if I ask someone at Jeep, they will say it will void the warranty just to cover their rear, but does it really say somewhere that half an inch more will void the warranty?


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one of the concerns regarding warranty coverage and overall tire diameter is the number of revs per mile. Larger tire causes the odometer to read less than actual miles travelled. For example if you have a powertrain failure at 95,000 km they could argue that the real mileage could already be over the 100,000 km point, due to the larger tire. You can of course show your tire receipt ie tire size XX was installed at that date and mileage, simple calculation to show what the max difference would be from current odometer reading.
 

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Dealership might be able to reflash the ECM for rim/tire size change


one of the concerns regarding warranty coverage and overall tire diameter is the number of revs per mile. Larger tire causes the odometer to read less than actual miles travelled. For example if you have a powertrain failure at 95,000 km they could argue that the real mileage could already be over the 100,000 km point, due to the larger tire. You can of course show your tire receipt ie tire size XX was installed at that date and mileage, simple calculation to show what the max difference would be from current odometer reading.
 

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Discussion Starter #20
one of the concerns regarding warranty coverage and overall tire diameter is the number of revs per mile. Larger tire causes the odometer to read less than actual miles travelled. For example if you have a powertrain failure at 95,000 km they could argue that the real mileage could already be over the 100,000 km point, due to the larger tire. You can of course show your tire receipt ie tire size XX was installed at that date and mileage, simple calculation to show what the max difference would be from current odometer reading.


Ok, but will bigger size tires void the warranty? Is it somewhere written that it is like this?


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