My car: Suzuki Celerio (EU/India) / Alto (Asia) 2010 mdl.
Hi, I'm downsizing from a r14 rim size to a r13. Current tire size is 155/65/r14 and that is the OEM size. My current rim spec is 14x5.5 et38 Rota alloys (wider than oem spec which is 14x4.5 et45 steel rims).
I have two option for tire sizes: 1.) 155/80/13 (taller sidewall) OR 2.) 165/70/13 (wider but same as OEM diameter, more accurate speedometer).
I found cheap alloy 13x4.5 et45 rims (from a Daihatsu Charade) that match up to my car's oem specs
The reason for the downsizing is because I am not satisfied with the current tire's ability to absorb potholes, I recently changed front struts (from old busted ones) and it seems that the tires are really just not pleasant to use on bad roads like the ones in my country.
Do take note that in India (where the Celerio is made) the oem tire size there is 155/80/13. The roads there are pretty bad too, potholes galore.
What is the optimal tire size? Should I go for a taller tire or maintain the OEM diameter? Would the slightly wider tire negate any efficiency benefits I get from downsizing?