I have got a Bug Vibe 50cc. It's a great bike and does exactly what I need it to do that is commute 5 km through city traffic and park in the city for $5 a day. My question is that I am 92kgs and whilst it will do 60km flat out it really struggles up hills. Given that I live in a very hill area, am I going to wear it out quicker than I would a larger, more powerful scooter (say 150cc)? What would be the normal life expectancy of a scooter this size anyway? I have been thinking of upgrading just to get a little more acceleration away from the lights anyway. If I hought it might prolong the life expectancy of a bike I ight upgrade sooner rather than later.