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i am looking for a new NRT tires,, i am not really sure what size to go for....
some say 215-55/17's and some says 225-50/17'
so what size is better ??
Depends on what you call better. 225-50 is going to be slightly wider and in theory will give u more contact with the road surface. 215-55 is possibly a tiny bit deeper side wall and maybe a little bit softer ride, though my betting is you will not notice the difference at all. The most important decision will be the tyre brand / tread / rubber compound as this will make much more difference to your ride.