from the best of my limited knowledge.if u change to the tires u
mention, u can actually carry heavier loads.speedometer little bit,
so no worries.Going over humps..it depend on wat suspension u
using..but again, 5mm not much..so dun worry...
only thing i can think off is if u corner, ur tire flex more
nia...
if can, put 205/55/15,but may rub against ur wheel arch wall if u
do full lock when doing u-turn.
But u change tire is for performance or ??if for performance, got a
lot ah..if for $$ den will be lesser..