irregardless of how they might look. which set up would be better for racing (auto-x & road racing) ...
15" wheels with 205/50/15
or same wheels but

16" with 205/45/16 ? (same width on both wheels)

some people tell me that it is better (especially if i get really light wheels like the CE28n's ) to get the 16" wheels over the 15" ... please post any knoweldge that is available . thank you very much. my mind is open to your advice

 

I think one factor is that you have to figure out what brakes you plan on running.
Another is what tire you want to run (like a race tire), and if they even come in a size you can use.

 

what car are these wheels going on?
Here, read this: http://www.grmotorsports.com/plustest.html

 

that article goes against everything people here say.

It seems like people here would run 10" rim on their CRX if it would clear the brakes...

 

Yes, read the article and note how not only did they change the wheel size, they also changed the width of the tire. Not a controlled test.

So a search about wheel sizes in the RR/AX forum. This subject has been covered about a billion times. Try searching "size" in the archived documents.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Geratol &raquo;</TD></TR><TR><TD CLASS="quote">Yes, read the article and note how not only did they change the wheel size, they also changed the width of the tire. Not a controlled test.

So a search about wheel sizes in the RR/AX forum. This subject has been covered about a billion times. Try searching "size" in the archived documents.</TD></TR></TABLE>

LOL wow, I didn't notice that the first time I read the article. With GRM's experirence in racing and such I would expect a much better comparo. I'm gonna e-mail em and request that they redo it with the same tire sizes

 

Consider the price difference between 15" tires and 16" tires...
when you go through tires more often than you change your washer fluid the cheaper tires are a good thing.

As for performance, I think the difference would be minimal enough to work with either way. (while one is heavier, the other has bigger sidewall...blah,blah,blah...)

Also make sure its 7" wide, so you can comfortably go beyond 205 if you ever want to.

 

The problem with the test is that there are so many variables that go into a lap time that one day of testing can't be that reliable.

Here's a quick list of all the things you have to take into account:
Wheel weight
Tire size (overall)
Tire temps
Age of tires
Surface temperatures
Driver experience as he/she keeps doing more runs
Etc...

Instead of looking at some test done in a day (or a few), look at the real test: The thousands of drivers all over the US trying different setups and tires day in and day out for many many years. Look at what the top runners are using and what common trends there are for each car.

On top of all of that, remember, don't learn everything you know from what you read on the Internet, hear from a friend, see on TV... Use those as suggestions on what to try and see if they work for you and learn from YOUR experiences.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrIllegalX &raquo;</TD></TR><TR><TD CLASS="quote">what car are these wheels going on?
Here, read this: http://www.grmotorsports.com/plustest.html </TD></TR></TABLE>

I hate that comparo. They really need to take that down as it spreads information in a mannor that makes a larger wheel look better.

Let's see the same test, as said, with tires of the same width but different diameters.

 

I think that GRM test was paid for by tire & wheel manufacturers wanting to sell more expensive items

 

Yeah, sorry guys, I didn't realize they used different size tires. I read it a long time ago, and as I recall they recommended 15" tires as being the best. They really should redo that comparison.

 

thanx for all your helpz.