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I am assuming that the Amica Si that you drive is the same as my 999 cc Santro. The question is do you want alloys for performance or for looks? If it is for performance (my preference) I strongly suggest that you stick to 13-inch alloys.
The specs of the alloys that I have fitted to my Santro are 13" X 5J with PCD 114.3 mm. and offset +26 mm. Here 5J means the width of the alloy wheel is 5 inches and PCD is the pitch circle diameter. The offset is a little low for my alloys (the stock wheels have +46 mm offset). I had to remove both the front mud flaps to prevent fouling of the tyres with the wheel well at full turn; this is due to the low offset of my alloys, which makes them stick out a little from the wheel well. The low offset actually increases the stability of the car and improves high-speed handling, without adversely affecting the Santro's superb power steering.
I have switched to Bridgestone S322 tubeless tyres of the same stock size (155/70-R13). The stock tyre was S322 tubetype. I do not recommend a tyre/wheel upsize for the 999 cc Santro, as it will bring down top speed and fuel economy. The grip is already quite good with my setup; note that the alloy wheel I am using is one inch wider than the stock 4J steel rims. I have jacked up the tyre pressures to ~35.5 psi (against the recommended 30 psi) and the car's high speed handling and cornering are just superb. See some of the videos in my signature. I should add that I am consistenly using 97-octane petrol for my Santro, for the last 20000 kms or so; it has done 80000 kms now.
This post has been edited by rks: Sep 7 2008, 09:43 AM
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