SM2 Rules and Tire Size
03-17-2007, 06:03 PM
#1
Drifting
Thread Starter
SM2 Rules and Tire Size
for those of you that run or have run sm2, ive got a rules question for you. i am looking into the possibility of running 335 rear tires and am trying to figure out how to best make them fit in a rules compliant way.
first option would be to flare the stock fenders. im sure there are kits and what not out there to add a 3/4" or so flare which should allow a 12-13in. rim with a 335 to fit without sticking out and without hitting the fender under full compression.
second option (and what i would like to do if possible) is to minitub the rear. according to 16.1 I on p.103-104, non-metallic inner fender liners may be modified/removed/replaced so putting in the minitub kit liner or modifying the stock one is legal. then according to 16.1 P, any mod to allow a legal mod is permitted as long as it has no performance gain in its own right. could i interpret this is mean i can cut the fiberglass floor in the rear to allow the minitubbed inner fenders? there would be no weight loss cutting the fiberglass floor would not cause any other performance benefit. anyone have thoughts or experiences with this? tia
first option would be to flare the stock fenders. im sure there are kits and what not out there to add a 3/4" or so flare which should allow a 12-13in. rim with a 335 to fit without sticking out and without hitting the fender under full compression.
second option (and what i would like to do if possible) is to minitub the rear. according to 16.1 I on p.103-104, non-metallic inner fender liners may be modified/removed/replaced so putting in the minitub kit liner or modifying the stock one is legal. then according to 16.1 P, any mod to allow a legal mod is permitted as long as it has no performance gain in its own right. could i interpret this is mean i can cut the fiberglass floor in the rear to allow the minitubbed inner fenders? there would be no weight loss cutting the fiberglass floor would not cause any other performance benefit. anyone have thoughts or experiences with this? tia
03-17-2007, 06:15 PM
#2
Melting Slicks
Member Since: Jun 2002
Location: Charleston South Carolina
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My understanding is no mini tub in SM2. You may flare the fender but you can't replace the entire quarter panel. 335s will fit with a fender flare.
Good luck.
Good luck.
03-17-2007, 06:36 PM
#3
Drifting
Thread Starter
will 335s fit in on a smaller rim width without messing with either? ive seen some people say yes but my gut says no.
03-17-2007, 07:07 PM
#4
Pro
will 335s fit in on a smaller rim width without messing with either? ive seen some people say yes but my gut says no.
Last edited by MySR71; 03-17-2007 at 07:09 PM.
03-17-2007, 07:23 PM
#5
Team Owner
Member Since: Mar 2001
Location: Boston, Dallas, Detroit, SoCal, back to Boston MA
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Hope this helps:
The class is in such a state of flux, don't spend $$$ until you get approval from Howard Duncan
16.1.I. Hoods (engine covers), front fenders, front & rear facias, and side skirts may be modified or replaced. Fenders may be flared as per Street Prepared. Non-metallic fender liners may be modified, replaced, or removed. Body panels may be attached with removable (e.g. Dzus) fasteners.
03-17-2007, 08:38 PM
#6
Former Vendor
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Unfortunately the C5 mini-tubs are illegal in SM2. This was specifically discussed on the SMAC and some of us wanted it legal, but were overruled. Stupid in my opinion (but hey I'm a Corvette guy).
As far as modifying/replacing the entire rear fender, the rear fender rule inherits from SP rules, so technially you may only modify the fender outside the wheel hub face (which on a C5 is about 90% of the fender). Could you combine this with the 1lb minor mod rule and replace the whole thing? maybe. Seems it would be up to a protest committee.
Cutting out most of the fender (outside the hub face) and grafting in a flared fender would be legal, but also alot of extra time and money with no resultant weight savings, so it would seem reasonable to just allow the fender to be replaced on a C5. Same result, less money. Seems like a good argument. You should write a letter to seb@scca.com pleading your case.
In any event, I have 335's on 12" wide wheels on a stock body car (ASP trim). They do stick out a little. As long as you limit rear suspension travel on a lowered car, it is ok. This is actually quite common on many ASP and SM2 Corvettes. Or you could just take a sawz-all to the fenders...... (that is also totally legal
)
Bob
As far as modifying/replacing the entire rear fender, the rear fender rule inherits from SP rules, so technially you may only modify the fender outside the wheel hub face (which on a C5 is about 90% of the fender). Could you combine this with the 1lb minor mod rule and replace the whole thing? maybe. Seems it would be up to a protest committee.
Cutting out most of the fender (outside the hub face) and grafting in a flared fender would be legal, but also alot of extra time and money with no resultant weight savings, so it would seem reasonable to just allow the fender to be replaced on a C5. Same result, less money. Seems like a good argument. You should write a letter to seb@scca.com pleading your case.
In any event, I have 335's on 12" wide wheels on a stock body car (ASP trim). They do stick out a little. As long as you limit rear suspension travel on a lowered car, it is ok. This is actually quite common on many ASP and SM2 Corvettes. Or you could just take a sawz-all to the fenders...... (that is also totally legal
)Bob
