1. When I threw this question out, I was wanting to get some feedback one the idea of considering changes to the rules based on the marketplace and availablility of parts. We have allowed changes base on parts and system developments before. Take the open ECU issue. It has far more serious implications on IT than the question of 7 " rims in ITB. Yet, because there are many drivers running FI, it passed the muster really quite easily. I must have been because the marketplace made somthing available that made working on your OEM ECU outdated or harder or more expensive.
2. I believe when the issue of ITA cars being reclassified came up about 2 years ago, there was mention that there was no competitive advantage of 7" over 6" rims. If that be the case, then to allow 7" in ITB would not affect the status of any other driver/car because it would not put the pressure on to go out and buy another set of whels.
I would suggest a test, using the same tires and same car/driver to verify no advantage is observed. I run SM Hoosiers, they fit both 6" and 7" rims. The Club does tire tests every year I think. We could run this test with both FWD and RWD cars to gain some data and review the results. Of course pressures would have to be adjusted with trial runs to gain the set data for the 2 different sizes.
This, cosidering all the responses to my original inquiry might be the best way to see through everyone's opinion and gain real data on which to base our rule making process.
The ECU issue is a totally different deal. What we have there is making the best of a bad situation created with a badly written/drafted rule. There were two rule steps to get here. Not relevant to this situation at all.
I certainly would not view the results of one test at one track with one driver as evidence either way on this issue.
I don't have any problem going to 7" wheels. I'll start shopping for some tomorrow if that is where we end up - because I do believe they represent a performance improvement, and my tire guy will like not stuffing 225/45 tires on my 6" wheels. HOWEVER. The argument that they are not available at reasonable prices does not hold water to me, especially in 5x100 bolt patterns.
All the VR6 VWs use that bolt pattern, and the first generation of them had 15" wheels.
All the 98-04/5 8 valve VWs came with 15x6 alloys.
You can buy custom configured 15x6 wheels from Compomotive if you like. In 18#, 17.2#, and others with unlisted weight.
Spin Werks will make custom wheels as well. They are in the $200/ea range last I checked on 13x6 sizes for 9# wheels, I imagine they can field a competitive 15" weight also.
The real question that needs to be discussed is justification beyond that it is harder for you to get what you want for a deal. Not all that long ago, I would never have expected the allowance for 15" wheels on any car that had smaller wheels stock, but we have that now. (of course as noted in the other thread, we now have some cars int eh 6" wide classes with larger oem sizes and no stock 16" options that are narrow enough. Now those guys may have more argument - 16x6 - 5x100....).
Greg pointed out that a common response is that folks have already invested in 6" wide rolling stock, and how that is a natural selfish reaction. Well I guess my response is selfish in that I don't want to make a change that may penlaize some, or many, or all of my current compeititors for the benefit of very few.
I would love to get 7" wheels, because I could then share wheel inventory with my prod car racing friends, but I'm not convinced there is a valid argument yet. I'm also not awfully steadfast in that position. I am close enough to the middle to be swayed.