I think changing tires to 205/70/r15, if this profile is available, will give you a raise of .67 inches that is more than half inch, your mileage will suffer a little only in city driving not on highway but i think it is the less complicated way of increasing car height. You can compare the tire size on Tire Size Comparison to see how much difference is there.
i just got 1" spacers at front and rear.. nothing changes.. fuel economy remains the same.. suspension also seems fine.. no sound when hitting cat eyes or on bumpy roads..
I have prius 2011, I want to change its shocks and springs to increase height (ground clearance) like my corolla Altis,
Need help in this matter, is there any genuine extra height shocks and springs available for this purpose
If yes than how and where can I find them
Professional advise needed
I would like to share my own experience. In 2010, I bought Vitz and faced the same problem. On one of my friend's advice I simply went to bilalgunj and got changed back suspension springs with the used Japanese harder springs and used car for five years without any issue in the car drive both in the city or on highway and without any worries of grave like speed breakers.
For the last 1 year I in using Prius that up graded with the Vitz and applied the same formula and again living in peace and enjoying Japanese car drive instead of local cars where companies are snatching money from the innocent people and pull out all the advance features just to make unfair heavy profits. Even government don't take any action against them because we people are silent and don't bother because " saday kol paisa bara ae pher ke ho gaya".
This post might be useful for others prius owner. I have a prius 2011 Just like every one else i had to be very careful while moving over the speed (car)breaker. Instead of going for spacer as i am not a fan to mess with suspension i went with tyre size increase . Recently after 44k on meter i changed the oem standard yokohama 195 65 R15 Tyre with a Tyre size of 205 65 R15. The difference is 2 % increase and most manufacturer allow less than 3% for safety.
The net result is a near 1 cm increase in height of car that is enough to clear bumps with peace of mind. Yes there is a trade off.Now I need to rev a little more, meaning a couple of notches off my km/l. yet braking and comfort had improved tremendously. (I went with continental contipremiumcontact 5 for top braking and comfort ,on the other hand these tyre have short life)