@devarshi84 Keep stock 14-inch alloy wheels (Are there lighter options available?).
This is the best option. Assuming that you have the SFXi model, the OE alloys are 14*5.5J, 100 PCD, ET=45 and approx 5.85 Kg each. I weighed one of them at the Mitsubishi A*S*S on a digital weighing machine.
@devarshi84 Also, I will go for the lightest 14-inch tyre in the 175/65 185/65 195/60. Which manufacturer provided the lightest tyres? Any recommendations?
Yokos A drives, Michellin XM2 and Goodyear Duraplus are the lightest. The desi MRFs, JKs, Bridgestones are still offerring their older patterns with 2 Polyester sidewall plies whereas most other 'comfort and low noise' tyres have a single Polyester sidewall ply.
For example:
Bridgestone Turanza ER60 185/70/R14 has these specs .....
Tread plies: 2 Steel, 1 Polyester, 1 Nylon
Sidewall plies: 2 Polyester
Michellin XM2 ...
Tread plies: 2 Steel, 1 Polyester, 1 Polyamide
Sidewall plies: 1 Polyester
@devarshi84 Upsize to 15-inch. Will I save weight compared to the 14-inch stock alloys plus 14 inch wheels combo?
15" alloys will be anytime heavier than 14" alloys and don't forget that the OE Mitsubishi alloys came with the JWL certification. This is Japanese equivalent of our ISO standards.
@devarshi84 I know that lighter weight at the wheels helps a lot, but with a 10kg sub in the boot, am I going to save that much by saving about 8-10 kgs at the wheel?
I was recently forced to upgrade the 13" OE alloys on my Lancer SLXi to 14" alloys because the stock tyre size 175/80/R13 is longer available. It took me 3 months to find everything to my liking. My ultimate goal was to NOT deviate too much from OE specs.
old worn-out tubed tyre Bridgestone S248 175/80/R13 = 9230 gms
butyl rubber tube = 980 gms
Mitsubishi OE 13*5J alloy wheel = 5500 gms
OE steel lug nuts (4) = 140 gms
Total weight per wheel = 15.85 kg
all above replaced with ....
New tubeless Turanza ER60 185/70/R14 = weight 8640 gms
Dzire OE 14*5.5J alloy wheel = 5900 gms
Forged Aluminium Lug Nuts (4) = 55 gms
Total weight per wheel = 14.59 kg
Thus weight reduction per corner = 1255 gms
Total weight reduction of car = 5020 gms (unsprung)
This unsprung weight multiplies 7 times and adds to the sprung weight when the car is in motion. So theoretically my car is now 35 kg lighter and I can feel it while driving.