195 50 i think....saga blm M-line is using

195 50 is wider and the thickness is lesser.better handling and stability

185 55 is less wider and the tyres is thick.good for comfort..    

195 is the tire wide in mm. 50 is percentage of thickness from the wide measurements.
So, 195 50 has 195mm wide and 97.5 mm thick.
Remember, thicker means larger radius or circumference. Will affect the speedometer.

Actually no. My M-Line BLM uses 185 60 R14
Yes. the 195 is width in mm. The 50 is the tire profile which is a ratio of tire sidewall vs tire width in percentage.

Yes, it will improve handling.

And yes it will affect speedometer readings. Anything more than 3% difference should not be allowed.

But there there are 2 more impacts of a bigger diameter:-

1) Slower acceleration and
2) higher fuel consumption.

195/55/15 makes the 15" wheels look small

hohoho... i also feel like snapping my rims with new tyre...

Using michelin XM2 and the rim... hurm.. i dont know... but the mech said its a lightweight rim, and in the shop, its only heavier then on off the enkai rims... whats the name... i dont remember... maybe i'll look at it in a while... hihi ^^