Wheel sizes in ITR.

[ekim952522000]

Ok so I am a little confused does the underlined part override the first part in bold or do both parts apply? The way I read this is, if a car came with 16" wheels and is classified in ITR you can run 15" wheels. Is that correct or do both apply?

7. Wheels/Tires
a. Any wheel/tire may be used within the following limitations:
1. Cars originally equipped with twelve (12) inch wheels may
fit thirteen (13) inch wheels. Cars originally equipped with
metric 365 wheels may fit fourteen (14) inch wheels, and
cars originally equipped with metric 390 wheels may fit
fifteen (15) inch wheels. The above-mentioned cars as
well as those cars originally equipped with thirteen (13)
inch or fourteen (14) inch wheels may fit up to a fifteen
(15) inch wheel. Cars may not fit wheel diameters smaller
than those listed on their spec line. All other cars shall
retain the wheel diameter fitted as original equipment for
their make, model, and type. Knockoff/quickchange type
wheels are prohibited. Wheels must be made of metal.
Cars classified in ITR may utilize any wheel diameter up to
17” or retain their stock diameter wheels if larger.

[joeg]

up to; so yes

[ekim952522000]

ok so you are allowed to downsize wheels in ITR.

[Greg Amy]

ok so you are allowed to downsize wheels in ITR.

No. All of those rules must be taken as a whole, not just the last line.

There are two restrictions; both must be heeded. Taken together they mean you can use any wheel diameter between the stock size and 17", inclusive.

Examples:

• your stock size is 15". You can use 15", 16", or 17"
• your stock size is 16". You can use 16" or 17".
• your stock size is 17". You can use 17".
• your stock size is 18". You can use 17" or 18".

HOWEVER, I can see where one can interpret where ITR has a special set of rules; I assure you it was never intended. It's yet another example of a poorly-worded addendum to a poorly-worded addendum to a poorly-worded rule. We went through this whole schmozzle when the rule was first written, then again when it was re-written. Looks like it's time for yet another "re-writ"...

Where's the topic I started on how to write a rule...?

[ekim952522000]

Thanks. That what I thought the intent was I just wanted to make sure. But I only new what the intent was because I remember the talks about it. If I was reading it for the first time I would have thought downsizing was perfectly ok.

[gran racing]

Gesh, that is confusing how it's worded. I didn't take it to mean what you said Greg. That's gotta be changed. Speaking of which, why is this just written for ITR? Wouldn't it be better if just written as a standard rule for all IT classes. Granted I'm not aware of any other classes that came OEM with greater than 17" but even if that never happens, it would reduce the confusion along with a re-write.

[SPiFF]

Why do we write dumb rules like this anyway? So people can get off rules nerding on these forums? Why can't the wheel rules be a little more sane such that we limit the max width per class?

[gran racing]

Why does it matter if a car used a wheel diameter larger than 17"? What advantage do they gain? I don't understand why this new rule was added. I'll have to search for that thread Greg referenced.

[JeffYoung]

Whole bunch of folks whittled on that rule and that is the best we came up with. It's not good, is it?

The thinking in the larger than 17s" was some ITR cars came with 18"s stock and we wanted to allow them to use their stock size.

[ekim952522000]

Why does it matter if a car used a wheel diameter larger than 17"? What advantage do they gain? I don't understand why this new rule was added. I'll have to search for that thread Greg referenced.

https://improvedtouring.com...ad.php?t=22779

[lateapex911]

Why does it matter if a car used a wheel diameter larger than 17"? What advantage do they gain? I don't understand why this new rule was added. I'll have to search for that thread Greg referenced.

Because if the larger wheel is disallowed, we have issues. Somebody now has to buy wheels when they could have raced on their stock rims, and...more importantly, and we decree that 17" is the largest allowable size, and the Futruristic Wombat comes with 19's, we might eliminate that car entirely because it's brakes may not fit within a 17" wheel. So it's a bit of future proofing as well.

[ekim952522000]

Are cars that come with 18's allowed to run 16's? How would someone know?

[lateapex911]

Because the rule says you can.

Cars classified in ITR may utilize any wheel diameter up to
17” or retain their stock diameter wheels if larger.

So, your ITR car came with 16"...you can go 17, or 16 or 15....ANY diameter up to 17.

your ITR car came with 18, well, your ITR car can use any diameter up to 17, or you can keep the 18s.

But, you can't run 18s if it only came with 17s.

The anomaly is a 19" stock fitment car could run 1 -17, or 19, but not 18, if logic serves me.