@ Terry aka Lancerman
The stock wheels / tyres on your GSR Sportback are:
Wheel --- 18" x 7" x 46mm Offset .... PCD: 5 Stud x 114.3mm
Tyre ------ 215 x 45 x 18
Now since your an Old Fart, a Family Man and have a Ministress for Trouble & Strife (wife) at the helm, you'll probably want to play safe and keep everything you do to your new GSR Sportback ...... Sedate & Comfortable.
Wheels:Keep to the 18" Diameter .... 19" & 20" will definitely fit, however a lower tyre sidewall profile will create/promote a harsher ride.
Width of Wheel .... Your best size would be 8" wide (most common on 18" wheels) with a Maximum of 36-40mm Offset.
Anything less than 36-40 (eg: 30mm will cause Tyre Scrub on Guard)
8 1/2" wheel widths are available on 18" wheels, however they "DO NOT" comply with the RTA regulations of 26mm max width over stock.
Simple Maths: 7" Stock > 8 1/2" = Increase of 1 1/2" @ 25.4mm/inch = 38.1mm.
They also require a 235/245mm min tyre width to stretch & reach the wheel lip properly.
Nothing looks worst than a wheel with exposed lip's because the tyre isn't wide enough.
8 1/2" wide wheels will also require a higher offset to bring them back to centre line so you don't rub the guards.
Tyres:The NSW RTA, now known as "Services NSW" has a ruling on Max Wheel & Tyre sizes:
Quoted off the RTA Website.
Minor changes to Wheels & Tyre's
Wheels up to 26mm wider than the largest optional wheel recommended by the vehicle manufacturer for the vehicle can be fitted without the need to notify the RTA.
The outside diameter of the wheel and tyre combination must be no more than 15mm over the largest diameter wheel and tyre combination specified for the vehicle.
And not more than 15mm below the smallest diameter wheel and tyre combination specified for the vehicle.
Link:
Guidelines for Alternative Wheels and Tyres
This is arguably the best online Wheel & Tyre Comparison Tools:
Rims & Tyre's - Wheel MasterUsing this tool will show that your stock wheel/tyre combo of 215x45x18 = 651mm Tyre Diameter.
If you add the allowance of 15mm, your max overall tyre diameter will be = 666mm Tyre Diameter.
In your case of pursuing comfort (the wife) and less wheel to guard gap, a 225x45x18 tyre sized at 659mm would be your best choice ...
This is the size I run on my Aspire mounted on 18" x 8" Rims.
Many guys run a 235 wide tyre with a 40 aspect ratio, but this brings the tyre diameter down to 645mm, which is 6mm smaller than GSR stock ....
If you go & run a 235 wide tyre with a 45 aspect ratio, then this brings the tyre diameter up - to 669mm, which is 3mm taller than RTA allowed ....
Play around with the Wheel Master Comparison Tool to see for yourself the differences & what sizes are acceptable within the 666mm Max Range.Suspension:You basically have 2 choices here.
Coil-OversBC Racing Coil-Overs are about the best your going to get for price & conformity for the current model lancer.
Fully Adjustable Ride Height & Valving.
Link =
Coil-Overs B-19-RA (BR Design RA Series) $1299Lowering SpringsThere are heaps of Good & Crappy Springs available from all sorts of Brand names.
The Best because of their Origin, R&D & Metal Material is --- Link:
EIBACH SpringsThey offer 2 types for the CJ Lancer
Link:
Pro Kit ------ Black --- Upto 40mm Drop --- Medium Ride --- Slightly Firmer than Stock ....
Link:
Sport Line --- Red ---- Upto 50mm Drop --- Very Firm Ride --- Way Too Firm for Road ...
Important Note: The EIBACH
"Pro Kit Springs" are available in 2 versions:
Part No: SKU: 6048.140A .... are for the Sedan & Hatch "NA" 2008 >
Part No: SKU: 6050.140A .... are for the Sedan & Hatch "Turbo" 2008 >
You Obviously require the SKU: 6048.140A for NA (Normally Aspirated) @ $448Video How To Link =
EIBACH Lowering Spring Install Video -- Mitsubishi Lancer 2008 >Hope this Info will suffice and keeps you Busy for a While .....