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#4125188 - 10/21/21 09:36 AM Re: Nitto 255/50R17 Tires Review [Re: professorP7B]
SocalSam Online   content
Over the Hill

Registered: 03/30/13
Posts: 3156
Loc: SFV, Calif.
Yup, suspension mods are in order to get the best out of the Nittos. Go with ADTR 25mm rear roll bar or 21mm HPP bar. Poly bushings and upgraded endlinks will sharpen the steering.
2004 CV LX Sport #2, 121,000 miles -- Current
2008 CVPI Arizona Beige, 121,000 miles, 677 idle hours -- Current
Option Adds: Message Center Instrument Cluster , Re-Key Locks , Passenger Door Lock , Autolamps , Ballistic Panels

#4125190 - 10/21/21 09:59 AM Re: Nitto 255/50R17 Tires Review [Re: professorP7B]
AlleyG Offline

Registered: 04/28/14
Posts: 628
Loc: Raleigh, NC
Originally Posted By professorP7B
The tire is not outperforming the car, lol! There is no such thing.

It very much is a thing. A tire that grips hard needs a suspension that can support it's gripping abilities. A high grip tire on a soft suspension (or a suspension with soft bushings) won't handle well, and will typically react the way my car is reacting.

Maybe those Goodyears weren't as bad as you thought.

Idk, 4/32 tread depth and severe dry rot certainly weren't helping...but like I said, they broke loose easy. The softer bushing setup was able to support their (low) grip levels.

Some things you just can't explain.

It's a tire, not string theory.

Oh, and they're G2's.

I wouldn't call CVPI suspension "soft".

All you changed was the tires, to a size that's too wide for the rim. Now you have flex on steering inputs. It's the tires that are causing the problem.

You can change all the suspension parts you want, but you'll still have that flex on steering inputs until you bump up to a matching rim for that wider tire.

2004 CVPI - 99k miles - RIP
1997 T-Bird LX - 92k miles
1994 Supra Turbo - 110k miles
Previous Fords:
1988 T-Bird, 1995 T-Bird, 1996 Cougar

#4125230 - 10/21/21 10:10 PM Re: Nitto 255/50R17 Tires Review [Re: AlleyG]
professorP7B Offline


Registered: 04/02/20
Posts: 361
Loc: Rhode Island
It's the tires that are causing the problem.

Are we not saying the same thing here? I've pointed to the tires this whole time, but it's foolish to not think about their effect on the suspension itself and vice versa.

These tires are on the wide side for a 7 inch rim, no question. But we're talking from 235 to 255. It's not like I slammed a set of 305s on the thing. Also, not for nothing, but this size was taken directly from the stickied Tire Swap post in this forum.

As for the CVPI ride, no it's definitely not soft if we're talking springs alone. I'm referring more towards bushing flex and other factors. Hell, you should feel the rear axle squirm on WOT 1-2 shifts in this thing! Some stiffening up is gonna help a lot of things beyond turn-in and road feel. My bushings are not in good health, dry-rot abound, and the rear arms are all just some cheap Mevotecs I threw in during my axle swap. In hindsight, I really should've sprung for the Metco or Heinous arms right then and there but just couldn't swallow the cost all at once at the time.
Teacher/Technician. First-time Ford owner. ASE-certified Advanced Level Specialist.
Current vehicles:
2011 Crown Vic P7B (SAP, former campus police vehicle)
Purchased 3/27/20 w/51K, 819 idle hrs.
The garage queen...
2011 GMC Sierra 1500 SLE
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5.3L LC9 V8 4X4 Ext. Cab
The trusty steed...
2007 Toyota Matrix, AKA "Morpheus"
Purchased 12/11/21 w/187k
1.8L 1ZZ-FE I4, 5-speed manual
What if I told you...

#4132036 - 01/04/22 11:08 AM Re: Nitto 255/50R17 Tires Review [Re: professorP7B]
highrzr Offline

Registered: 01/02/13
Posts: 11
Loc: Ohio, USA
I'm running Nitto Motivo 255/50/17's on 2005-2009 Mustain rims. The rims are 8" vs the 7.5" for the steelies. If my steelies didn't look so crappy, I'd have kept them and still used the slightly larger tire. Honestly, in my experience, they are just as crappy as the OEM Goodyear tires where which the car came with. I'll probably still replace them with the same Motivo tires as I can't get any real better UHP tires in that size.
2008 P71 stock, but working on that...

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