u thinkin bout changing due to the bounciness?

Then u r missing the point of getting SX version, u should get EX version instead.....
SX came with 17'' rims, bcoz of the gripness and provide more traction to the ground. 1 of the biggest point of our forte's less bodyroll and stability is from the rim itself....no matter u change light weight rim or ori heavy rim, both 17'' will serve their same purpose...I wan 17'' rims is bcoz of this very reason, my FC not high(of coz in city drive sure makan more)....
If u wan better FC, as well u get Toyota VIOS or Ford Fiesta....coz they're lighter, and engine more tune to fuel economical type.....
Forte SX is more about safety, that's why 17'' rims included, factory calculated all well....if u wan good FC for Forte, get EX...
Yes, i do agree 17'' tyres are expensive, pick-up slow, FC slightly higher.....but with it, it enhance ur safety(which something u really need and can't buy from any other shops)...