fitting 345 with IRS?

[fastmach01]

Im looking at buying new wheels for my car and i want to run a 345-30/18. That size wheel and back spacing will i need. Also what modifications will i need to do for clearance. Thanks in advance

 

[04whitesvtlight]

Not sure what my back spacing is but I run 18x11 true forged wheels with 335 Hoosiers with low pro irs bolts and rolled fenders. I have a decent amount of room on both sides It has never rubbed and I think I could run 345 no problem. But I am going solid shortly so it won't matter.

 

[Jefe]

I have a half inch of space between the stock IRS bolt heads and my Rival 335s on CCW 18x11s. I would do low profile bolts to fit 345s

Member Competition ran 345s, you might ask him

 

[fastmach01]

Not sure what my back spacing is but I run 18x11 true forged wheels with 335 Hoosiers with low pro irs bolts and rolled fenders. I have a decent amount of room on both sides It has never rubbed and I think I could run 345 no problem. But I am going solid shortly so it won't matter.

i like it thanks.

I have a half inch of space between the stock IRS bolt heads and my Rival 335s on CCW 18x11s. I would do low profile bolts to fit 345s

Member Competition ran 345s, you might ask him

Sweet thanks. You happen to remember your back spacing?

 

[SpectorV]

not sure how this would ever work without the rim/tire sticking out from under the fender, for an 03/04 cobra thats lowered 1.5+ inches a rim that frontspacing is 3.75 inches is about perfect visually. That puts the rest of the rim inward (width - backspacing = frontspacing)

 

[Jefe]

Sweet thanks. You happen to remember your back spacing?

I dont but I believe CCW sets them at 6.75" in the back

 

[fastmach01]

I dont but I believe CCW sets them at 6.75" in the back

sweet thanks

 

[TRQJUNKIE]

I don't see the point of running a super wide tire with out increasing the rim width. You can run a 315 and a 335 tire on a 10.5 rim, for example, but still have the same size contact patch on the road. The excess tire just tapers upwards and forms a bulge.

 

[SickBlackMach]

I don't see the point of running a super wide tire with out increasing the rim width. You can run a 315 and a 335 tire on a 10.5 rim, for example, but still have the same size contact patch on the road. The excess tire just tapers upwards and forms a bulge.

Sage advice. OP, are you hell bent on running a wide tire? Are you looking for driving it daily, or random trips to the strip? That alone makes the biggest difference in "what to buy" in a tire.


FWIW: I have 335/30/18, on CCW 18x11. The BFG manual calls for "11.5-12.5"" for the 335 width. Their next size down is a 295/35/18, the BFG manual calls for "10-11.5" rims. I elected to go 335 on a 18x11 CCW, had a HELLUVA time finding a shop that would install a 30 series tire and warranty the work. We won't even get into fender rolling spacers.:bash:

 

[604cobra]

315-30-18 bfg drag radial on ccw 10.5x 18 , w/7" bs .irs bolt, no spacers ,no rolled fenders, modded irs mount for side wall .

 

[fastmach01]

I don't see the point of running a super wide tire with out increasing the rim width. You can run a 315 and a 335 tire on a 10.5 rim, for example, but still have the same size contact patch on the road. The excess tire just tapers upwards and forms a bulge.

As I stated im looking to buy new wheels and tires there for i will be purchasing i wider wheel for the wider tire

 

[fastmach01]

Sage advice. OP, are you hell bent on running a wide tire? Are you looking for driving it daily, or random trips to the strip? That alone makes the biggest difference in "what to buy" in a tire.


FWIW: I have 335/30/18, on CCW 18x11. The BFG manual calls for "11.5-12.5"" for the 335 width. Their next size down is a 295/35/18, the BFG manual calls for "10-11.5" rims. I elected to go 335 on a 18x11 CCW, had a HELLUVA time finding a shop that would install a 30 series tire and warranty the work. We won't even get into fender rolling spacers.:bash:

I work at a shop and can install them my self thats not a issue

 

[TRQJUNKIE]

As I stated im looking to buy new wheels and tires there for i will be purchasing i wider wheel for the wider tire

Best thing you can do is get the dimensions for the rims your looking at then take actual measurements on your car and see if they will fit.

Tire wise, you would need a 12" wide rim to partially satisfy a 335 let alone a 345 tire. By satisfy I mean make full intended contact patch touch the road.

 

[Nolimit]

So what would be the best size tire for a 10.5 or 11" rim? And by best I mean what will provide the greatest surface are for contact point. I was going to get a 11" rim and throw a 335 on it but makes sense when you say you can go to big on tires and basically just waste a tire.

 

[svtshadow]

Best thing you can do is get the dimensions for the rims your looking at then take actual measurements on your car and see if they will fit.

Tire wise, you would need a 12" wide rim to partially satisfy a 335 let alone a 345 tire. By satisfy I mean make full intended contact patch touch the road.

As long as they like the looks of it and functions properly!

 

[FromGTtoSVT]

So what would be the best size tire for a 10.5 or 11" rim? And by best I mean what will provide the greatest surface are for contact point. I was going to get a 11" rim and throw a 335 on it but makes sense when you say you can go to big on tires and basically just waste a tire.

305/35/18 R888 would be my suggestion - just about same contact patch as a 315/30/18 r888

it's what I will be running once my wheels get here