with the 12t from a dead stop going up a hill was painfull. If i was already in the pipe it climbed em wth no problem. I ended up going back to the 10 as it is quite hilly by my house (and i dont really need to go faster than 40 anyway).
I rode someone elses v1 at the last rally with an 80cc polini with 10x37 gearing. It was stupid fast.