Race the bike you have now. Get some experience. You'll start to work out what you need from that. At 4th cat level the bike you're on makes no difference to your performance. Decent tyres will make a small difference.
By the time you've done five races, you'll have more experience than 80% of the people who have posted here thus far. You'll work out what bike you need by yourself.
By the time you've done five races, you'll have more experience than 80% of the people who have posted here thus far. You'll work out what bike you need by yourself.