Originally Posted by HernĂ¡n Grimberg
So you mean that you can add 7/8” (0.89”) to the diameter and there will be no rubbing?
How about increase in mpg?
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Don't focus on how much tire was added here look at the height and width of the tire.
Michael Guerrera, started off with 215/65/16 which are 27" tall and 8.5 " wide. The 225/70/16 are 28.4" tall. So in his case he moved up 1.4" He could do that without rubbing because he started with a 27" tall tire.
Because I'm starting with a 28" tall tire I don't think I can add 1.4" of tire pretty sure a 29.4 " tall tire without a lift would cause all kinds of issues. What I'm paying attention to is that he posted a 28.4" tall by 8.9" wide tire is clearing everything without issue. For me that is if I could find a tire in a 17" that was 28.4" tall that would only increase my tire height by .4" but the closest I can find is a 225/65-17 which is .5 inches taller with the same 8.9" wide. Looking our Trailhawk over I can see the extra .1" should fit just fine.
As near as I can tell there were at least 1 more 17" size tires listed for a 2018 Compass besides the Trailhawk it looks to be a 225/60-17 or 27.6" tall 8.9" wide. But again as far as fitting without rubbing total tire height and width is what to look at and not how much larger than stock the tires are. Something I have not thought about here is backspacing on the rims I want to find out if backspacing and rim width is the same or works out to the same. I'm sure in my case I will be fine but if others have different backspacing and width it could throw things off a bit. So I still advise measuring as I pointed out in post above.
As for MPG this is where height over stock matters as it changes the last gearing figure in your drivetrain. In theory your going to lose some city and gain some highway with a slightly larger tire. How much depends on how much you change your tire size your driving style and tire choice. The weight and rolling friction of the tire will change from tire to tire. There is a point in increased tire size where both city and highway MPG will suffer but we are not talking anything near those sizes here. I have seen little effect in MPG on any of my vehicles where I bumped up tire size by an inch or less. On my 03 Chevy Tracker I increased tire height by ~2.6 inches I lost 3 MPG city and gained 2 MPG highway. But each vehicle will be effected differently because of gearing/weight actual tire selection and other variables. I don't see bumping up tire height by less than an inch really hurting our MPG on our Compass very much at all if we select the right tires.
I would try to avoid heavy ply tires like those used for heavy duty trucks unless your wheeling were you need a heavy thick tire they tend to weigh a lot and this combined with extra height is going to really put a dent in your MPG.
A quick look at Tirerack.com shows the stock 215/65-17 Falken Wildpeak tires on our Trailhawk weigh 27 lbs. In a AT 225/65-17 I can get a BFGoodrich KO2 tire which is a great AT tire but it weighs 39 lbs and I'm not sure a lighter ply is available in this size for this tire. This tire is going to cost a lot MPG in stop and go traffic and because it is a heavy load range it will ride rough on something lighter like our Compass. Then I looked at other tires in the same size to compare weight and I find a Pirelli Scorpion AT weighs in at 29 lbs this weight wise would be ok on MPG. It is a lighter ply tire so ride would not suffer too much. However I personally do not like the looks of it to me the Wildpeak looks better. But I'm still looking at tires and with only 10k on stock tires I have plenty of time to shop to find a tire that will be the best all rounder for us.
These are all the same things you should be looking at if ride and MPG really matter to you. So when your tire shopping look at the load range and weight of the tires. For MPG try to find tires around or less than 30 pounds each.