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Questions Following New Wheels/Tires


hbwike05

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Hey all, this will be Post #2 for me on essentially the same topic. I would appreciate any input....... however harsh it may be.

 

I own a 2006 Spec B. and recently purchased new wheels and tires for summer driving:

 

NEW

Wheels: Tenzo R Cuzco Ver. 2.0, 18x8.0, +45mm offset

Tires: Nitto Invo's, 235/40ZR18

 

ORIGINAL

Wheels: Stock Spec B., 18x7.0, +55mm offset

Tires: 215/45R18

 

Let me start off by saying, I got to these forums too late. I wasn't fully educated on the importance of offset and now I've got a 10mm delta that I'm wondering about. Initially, I encountered a small amount of rubbing in the rear, but after removing a few rubber guards, the rubbing is no more.

 

Visually, I think the setup looks great, but after putting a few passengers in the back I've discovered that the ride is noticably more harsh. If I'm doing some city driving, it just seems to be less forgiving in the back seat and the "slams" from hitting modest potholes seems more pronounced.

 

I knew full well before purchasing everything that it was going to result in a difference in ride. However, I'm now wondering if this decrease in comfort has resulted from an error on my part. I've seen various posts indicating the "rule of thumb" is to stick within +/- 5mm of the stock offset and I'm double that. Is this possibly (or obviously) what's causing the degraded ride comfort? Whether it is or not, is there anything I can do about it?

 

I'm not certain what the most useful information would be if you're trying to answer those questions. Please fire away if there are some key characteristics you'd need to know!

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Your offset should have no bearing on ride comfort. Offset measurements come into play when suspension clearance or fender rubbing are an issue. +45 is within the recommended offsets for proper fitment according to FAQ: Offsets, Sizes for Rims and Tires on the GT! Xenonk Version! and as they fit on your car it's not an issue.

 

The main things causing your harsher ride are most likely the decrease in tire sidewall height (i.e. 45 down to 40) providing less cushion to your ride as well as the increase in sidewall stiffness you've gotten by upgrading your tires to a higher performance model.

The Ridiculousness is no more :( But you can have your very own piece of it. **The Ridiculous Part Out.** :D
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I can't seem to find the weight of the wheel actually listed anywhere, and googled for a pretty long time, but I came across a post from someone here on LGT forums saying that the 18x8 wheel that you have weighs between 23-25 lbs, which is pretty heavy for an aftermarket wheel.

 

I've read that a heavier wheel can both work for or against you with regards to ride harshness. I think in your case, with a low profile tire, it will work against you. The heavier the wheel is, the less it 'wants' to move when you hit a bump, resulting in the shock of the bump traveling upwards and eventually getting to you. I've also read that the opposite can happen, which is that a heavier wheel which is reluctant to move will force your tires to compress and absorb the bump. But personally, and this is only my opinion, I don't believe that applies to low profile tires. The sidewalls are stiff, and there isn't really that much air at all, so there's nothing to compress, and you end up jolting the car.

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You should have no issue with +45 on those wheels.

 

Do lots of reading on the forums. There is a ton of helpful information to help you with future purchases ..... if nothing but to relieve that post purchase stress I'm sure you felt.

 

Good luck and enjoy.

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