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Old 08-05-2019, 09:55 AM   #8229
Norm Peterson
Scooby Newbie
Member#: 498642
Join Date: Mar 2019
Chapter/Region: Tri-State
Location: our wrx IS the family sedan
'19 WRX Limited 6M
'08 Mustang GT (the toy)


Originally Posted by rst.ack View Post
Derailing this slightly, I'm looking at getting some Enkei RPF-1's for my daily-driven 2015 WRX (original, I know but I really like how the shape of the RPF-1 cross section accentuates a meaty fitment), but can't decide between 18x9.5 +38 or 18x9 +35, running 265/35s.

I'm aware that 265 is on the limit of how wide one might normally go with a 9" wheel, but I'm after a functional, meaty fitment.

It's quite common for me to go ragging the car on some mountain/backroads for a bit of fun, but I don't have any intention of ever taking the car to the track.

I know both of those widths/offsets physically fit the WRX, but my question is more along the lines of which one would be the more logical choice in terms of:

- The look of the fitment - would 265's on a 9" be "too" meaty (I don't even know if it's possible to be too meaty)?
265/35 will have a slightly more rounded sidewall shape on 9" wheels. But the actual section width (that 265 number) shrinks to about 260. No free lunch.

- The weight saved by going for a 9"
Assuming same wheel mfr and wheel model, negligible in any street use.

- The handling - would 265's on a 9.5" perform better or worse than a 9"?
Lateral stiffness and other tire stiffnesses go up with increases in rim width. That generally improves turn-in response and steering precision, given the same tire mfr/model/size. The steering may feel heavier, but that's not the same thing.

- The feel - would 265's on a 9.5" tramline less or more than a 9"?
Hard to say. Tramlining seems to be something that some tires are worse about than others, and sometimes a toe out condition has as much or more to do with twitchiness as you drive as the tires.

FWIW, 9.5" is the "measuring width" for 265/35's, so it's by no means a 'stretched' fitment where you might expect any tramlining to be more evident.

Also, being a big newbie to aftermarket wheels and tyres, will I need to purchase aftermarket valve stems and/or different lug nuts? I know I need hub-centric rings...
Best to check with the wheel supplier. Sometimes a wheel design does not permit the use of sockets for standard lug nuts, and I've seen where some aftermarket wheels used a completely different type of lug nut from OE.

Stay away from aluminum lug nuts, no matter how pretty they might look.

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