Originally Posted by jayesh
I am not sure regarding upsizing the rims(that would mean i will have to purchase new tyres also-right),many people have said that upsizing is not safe specially for tall vehicles like eeco/van.
i would like to go with the same size
jayesh, you can upsize the rims and upsize the tyres too. What matters is the total diameter of the wheel.
To give you an idea, Eeco has 13" rims with 155/80R13 tyres. 13 is the tyre diameter and 80 is the profile - 80% of the 155mm, ie., 4.9" will be the sidewall height. So total diameter of the tyre will be 13" + 4.9" + 4.9" = 22.8".
If you can maintain the total diameter within 2% of the stock value, you may upsize the rims and tyres. For example, 14" rims with 175/65R14 tyres have only a 1% increase in total diameter, but are wider. They provide better grip, but there's marginally less cushioning provided by the air. Reason, the profile is now lower - there's only 4.5" of sidewall as against the 4.9" with the stock size.
Bridgestone has this upsize (175/65R14) available in Potenza-GIII and Turanza ER60 ranges, Michelin has Energy XM1+ and Energy XM2 ranges. Michelins provide better grip is what i heard, due to the softer tyre compound. But they wear out faster for the same reason. Bridgestones are a balance between grip and longevity.
Steering will be a bit more tight, but not too much to cause any perceptible additional strain, except when trying to turn the wheels when the car is stationary.