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Tire size input needed! 235/45 vs. 245/40 on RPF1s


turboboost

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Trying to decide on new tires for the 08 LGT, which will be lowered on H&R springs (F/R 1.4"/1.3" after settling supposedly) + Koni Yellow inserts. I picked up a set of 17x8 +45 Enkei RPF1's, and have been going between 235/45 or 245/40. I want a nice, wide footprint, so I'd rather not go 225/45.

 

The tires in consideration are Bridgestone Potenza RE970AS or Michelin Pilot Sport A/S Plus.

 

If anyone has any pictures or experience with going 245/40's on a comparable (or even lower!) strut/spring set-up, I'd love to see/hear how it worked out (if at all). Any recommendations or thoughts would be awesome.

 

Thanks!

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Additional info, I removed the rear rubber fender liners and would prefer not to roll my fenders, but will if necessary.

 

Also did a tire size comparison at http://www.1010tires.com/Tools/Tire-Size-Calculator/215-45R17/225-45R17/235-40R17/235-45R17/245-40R17 and found that 245/40/17 is the closest to stock diameter and sidewall height.

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Whitetiger - You know, I was hoping you would respond, since all the threads that I could find on 245/40s always featured your input. I've got dedicated winters on stocks with chains, and when the budget grows, I'll get dedicated fat summers on another set of wheels. But until then, I'll be using all-seasons to get me through the rest of the year.

 

Do you have any thoughts on how the 245/40s will hold up with my Koni/H&Rs?

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Actually, the price point of the Potenza's isn't THAT bad if you get them from Costco: $184/tire - $70 instant rebate = ~$166/tire. You're right that I could probably do better and if I had more time, I'd order from TR, but I'm impatient as hell (haha) and I want to get the RPF1s+245/40s mounted on Saturday by AZP since they'll also be doing my TPMS swap and H&R's.

 

But from what you're saying, even with my lowered suspension and unrolled fenders, I should be in the clear and without rubbing to go wide with 245s.

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But from what you're saying, even with my lowered suspension and unrolled fenders, I should be in the clear and without rubbing to go wide with 245s.

 

It will be close. If you had some sort or rear camber adjustment, it would help make figment easy. I ran a 245/40/17 on a 17x8 +48 but I had camber arms arm to ensure figment. Worst comes to worse you do a very modest roll in the rear. I think you will be ok though.

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@Drift: It's really just matter of personal preference. You're right - it's my DD, but I like to drive spiritedly and take corners hard. Narrow or wide, both sides of the argument have their merits and disadvantages (as many threads have established), so there's no right or wrong. In the end, I simply prefer the aesthetics and performance of fat, wide tires. I do appreciate your input, though.

 

@Whitetiger -You've convinced me. I ended up ordering the 245/40s Potenza's and they'll be ready for pick-up on Saturday. I've got my fingers crossed that I won't have to roll, but realize that I might have to. Unfortunately, AZP doesn't roll fenders - since you're also in NJ, do you have any recommendations for pro places that roll? The last thing I want is chipped, cracking paint...

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I drive up north (Canada, VT, NH) pretty much every weekend I can during snowboarding season. Towards the Canadian border (Jay Peak, Smugglers Notch etc) and farther north, the smaller roads tend to be plowed less frequently and can get pretty dicey without the right gear. The winters are generally sufficient, but I'll keep the chains in my trunk for reassurance.
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No clearance. I hope you're using them on all 4 also. Honestly though, snow tires on our cars should be sufficient. With a good set of winter tires, you'll probably get high centered from lack of ground clearance before you have issues with traction.

 

edit: On the other hand, they probably will help with roads that may be iced over... the cable should help dig into that.

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iNVAR - Ah, makes sense.. Never had a clearance issue with the cables, so I guess I was blissfully ignorant. And yes, the cables always went on all 4. Good snow tires will get you out of most reasonable conditions, but like you've noted, when the snow gets hard-packed or iced over, the cables really do dig in and help out.
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for dd, should stick with 225 or even 215

 

why bother with so much tire? waste of money...

 

225s come stock on OBXT wheels, 7" wide. Why would you recommend the same size (or thinner) for an 8" wheel?

 

stretched tires FTL.

"Bullet-proof" your OEM TMIC! <<Buy your kit here>>

 

Not currently in stock :(

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