295/35/18 on 9.5" wheel

chrischhorn

I know a lot of you guys are running the 295/40/18 Hoosiers on the 9.5" on fronts but is there any side effect? Hows the handling? Any sloppy feel at all? I have on order and plan on 275/35/18 on front and 295/35/18 on rears with a 18X9.5 front and 18x10.5 rear but I'd like to go square setup with the 295/35/18's if I can. I still have about a week to change as TireRack won't have my tires in stock till the 19th. If the feel is a little sloppy, is the extra grip worth it? My events are all for Autocross by the way as I'm sure that makes a difference the recommendations.

BTW another perk for me is I work in a tire shop. I can actually remount my tires to rotate as well to get better wear but handling is my main concern. Not tire life.

Thanks all in advance.

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clintfocus

i wouldnt run 295 on anything less then 10.5 because of sidewall dynamics under load and contact patch optimization. but im sure plenty of people here have done 295 on 9.5 and will say "its fine"

122554

275 is about the max I'd go!

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chrischhorn

Well with no other input, I guess I'll stick with my 275/35 on front and 295/35 in the rear.

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clintfocus

thats what i would do until you get 10.5 all around, then go 295 square

chrischhorn

it'll be a while for that. The WEDs only come in +12 offset for the 10.5 which would probably require more camber then ID like to clear the front not to mention clear brakes. RPF1's probably will be next order in a square setup for but with Hoosiers.

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Sh0velMan

RPF1's don't clear the...ohwait you have base brakes...

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Megan370z

the +15 offset does clear the OEM BBK and my AP Racing BBK
it wasn't the case with the +30/38 though

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clintfocus

yeah et12 18x10.5 would be really aggressive and prolly rub under track load

how much front camber do you run and what size tire?

Megan370z

The front are 9.5 +15 on 275 tire.

I had to roll the front fender to safely avoid rubbing.
The front camber was like -2.7 (track setup at that time )

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chrischhorn

HEY!!! I'm workin on that ok lol. With only autcross out here in Hawaii, a BBK upgrade is on the bottom of my list of things to do. I upgraded the pads to Project MU HC+800 and I think that will be more then enough for just autocross. Also remember our average course is 35 to 45 secs so short courses also.

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synolimit

Rpf1 will clear diameter wise but high offset need a spacer. I have a +45 with a 20mm spacer. 15mm would have worked for a +30 overall but I didn't want to do the work of installing the longer studs.

OP rule of thumb is dont go over 20% width. A 9.5" wheel can support a 289mm tire and be fine.

Stock suspension and with a iPhone and a level I got -0.9 front left, -0.5 front right, -2.1 rear left, -1.5 rear right. Fronts stick out but I need -3, -2 camber to pull them in and get a good track number. Fronts 9.5" +25 on 255/40 and rear is 10.5" +15 285/35.

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chrischhorn

255 is not enough tire under heavy braking load. Thats what I'm on now. Going with a 275/35 and 295/35. Hoping TireRack gets my tires in and ships them out tomorrow! Then Happy B-day to me!!!

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IMWEZL

Chris you probably already ordered them but Costco in Waipio has pretty good deals on RE11s if you like them and they work for your size.

My only concern with Hoosiers is that you probably need more seat time with street tires before you can take full advantage of a set of race slicks. Most of those guys auto-x with us in Hawaii region have been doing it for decades. Heck, I want to say there are at least 5-8 National Championship drivers in the field. My point is they make it look easy on slicks. Learning on street tires for 1-2 season will work out any bad habits and make you much faster (1-2 seconds) on slicks.

mdxj

What are your rears? I am running SSR Type F's, 19x9.5 up front with a 275 and zero rubbing but at factory height. I didn't know the RPF1's cleared the AP's. found my second set of wheels now I think!

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