Ok, offset determines how far your tires stick out from the car. Right? good.

Whats the stock offset measurement on our cars?

What does that mean?

I'm getting Tenzo RS5s 17x7s- whats the offset? Does it even matter on the rim? or is it all in the tire size?

and what tire size is right for our cars when upgrading to 17 inchers? Because I've heard that if you increase the wheel size, but don't decrease the tire size, things like your speedo will be off.

Is the speedometer problem fixable? or is the only way to go with lower profile tires (and get much lower ride quality).

Does upgrading to 17s and decreasing tire size even increase handling? or is it the same?

As for offset recommendations- what do they mean and how do I implant them? I'd like to have the new rims to stick out from the car a LITTLE (I think it looks very rallyish and cool >> but will that cause rubbing problems?

And whats this about checking break clearance? Is that only needed when going the other direction (more IN to the car)

is going out to less flush with the car a stupid idea? Feel free to tell me so.

I did a search, but all I got was a lot of garbled results. A couple were decent. "Use this and this offset" but I still didn't UNDERSTAND the reasoning behind it.

and whats this about a higher number offset being in closer towards the vehicle?

So confused! Help!~!!

Thank you so much jay!

changing overall tire size will change gear ratio which will affect performance.. adversly?

Upping you wheel and tire size will probably adversely affect performance. The reason being is that you are putting more rotational mass farther out from the center fo the wheel. Given the same amount of weight, a 15" wheel/tire will be quicker than a 17" wheel/tire, since even though they are the same weight, the mass is actually distributed farther out from the center. You can offset this performance detrement by going with lighter wheels than the stock ones. Basically, the gains/losses are going to be negligable unless you are racing... unless you are going with some 50 pound wheels or something >> I wouldn't sweat it too much.

i have 215/35/18 and my speedo is the same

Shawn, you're going faster than you think you are....

as for the rotational mass thing, you're right on both counts.

Smaller size overall increases acceleration from a stop, while a larger tire size actually helps acceleration and top speed. So it's a give and take >>

Will this also affect the odometer?

Nooooo >>

but it'll show as less miles than is really on the car, right? hahahahaH!

-shid+Jun 2, 2004 - 7:40 PM

Excellent >>

Alright, so what if you were wanting to go with 18x7.5's or 18x8's instead...what offset would match the tires with the EDGE of the fenders? I need to get some rims that will fill the wheel well and come to the egde of the fenders.....much better than the stock ones hopefully?

And if anyone knows of any suggestions I am open to that as well. I am a newb....just got the celi, still checking things out....but I want some black or gmg rims with a polished or chrome lip....any suggestions?

Its like they said, the correct offset differs from rim to rim

Just remember that changing the rolling radius will have an impact on your speedometer. The difference between a 225 and 215 tyre on an 18" rim can throw your speedo out by about 3mph at 30mph but about 7mph at 70.

Check out this tyre fitment calculator to see how your new rims and tyres will affect your speedo.