19 lb vs 24 lb tires

Since you're already going to a heavier 17 inch wheel than the stock rims, you should definitely get the lighter of the two tires.

You don't want the weight farther away from the center of rotation, which is what you are getting with the larger diameter wheel. So minimizing the weight, by getting the lighter tire, makes sense.

The $40 price difference is probably worth it, and you'll likely get it back in time with fuel savings over the heavier tires.

The other factor is the "butt dyno", the heavier tires will feel slower, and you'll take longer and have to rev the engine harder every time you accelerate to get to speed. So if you drive a lot of city miles, with a fair amount of stop and go, you want lighter tires. If you drive mainly highway or freeway miles, then maybe you can get away with the heavier tires.

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FYI, the FRS rims on a Gen 3 in the past required a 3mm spacer to clear the rear brake caliper holder.

The 16 inch old school Subaru Impezza WRX rims I put on our 2011 clears the rear caliper holder by about 1mm, a bit close for comfort, so I put 3mm spacers on for peace of mind.

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If you get ~50 mpg (baseline) and go 70K miles you'll be using 1400 gallons of gas. At about $3/gal (adjust for your local area) this is $4200.
If you get a 1 mpg improvement, this is about 1/50th of that or $84. About 2x the price difference.

Mike

 

Do you need the spacers for the rears? Were you able to test fit the rims on the car? If you do need spacers, try to get ones that are hubcentric. I was able to find 3mm 5x100 spacers with the proper 54.1mm centerbore.

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I've had wheels so close on a car that the calipers actually made a small void in the alum wheels backside . Never an issue either . The tire place thought it was pretty cool it ran through about 9:00 sets of tires.

SM-A715F ?

 

Oh and I run cheap tires from Poland 17s weird size too like what do we get boo 245 55 17 and their LRR and all that and cost us like 48 bucks a pop and they roll pretty good for close to 40k and I like that because the tires don't do well in the southeast they're not black but for about 3 months and then they turn white all of them even the Michelin defenders all you're doing is spraying more tire shine and tire black on them trying to abate the sun. So I like about a 14-month turnover and then I'm putting new shoes on her

SM-A715F ?