Remutaka Hill (Wairarapa NZ)

yea well I kinda have ro try keep my speed through corners or else my poor car bogs under 50kmh....therefore my tyres get a real currently on 155 70 13 but i want to go 14s or 15s but tyre size is a bastard to match. I made a balls up and misread my tyre size or went from memory....grabbed 4x 175 65 14s and they look waay huge to run on my poor car. look like a rally car i think if i used them. I ideally want to have less side wall flex and a bit more tyre on the road.... anybody got thoughts? what you guys run? i know a bigger overall rolling diameter leads ro a crooked speedo