>>966282>My current ride is a Cannondale r600 from '92 I think. Fun bike, but fucking stiff.I've got a r800 CAAD5
I know exactly what you mean about nimble and stiff.
The nimble feeling is from the short chainstays. The closer the rear wheel is to your crankset, the quicker the turns will feel.
A track bike with a curved seat tube like pic related will have very fast handling
Then the front end, there's this thing called fork trail that you're going to have to read about if you care enough. It affects handling in big ways. I don't recommend screwing around with that until you know a little more
Another is simply the stem length. Shorter stem means twitchy handling, some like and some don't.
Anyways, your r500 is about as quick handling as you'll find without spending a lot of money
Consider getting a second bike and making THAT your good bike. Take the cannondale and see if you can fit 32c tires on it. On my Cannondale I can fit a 32c in the front, 28c in the rear (marathon supremes)
Cannondales are nice but I beat the hell out of mine and don't really care. Bikes are meant to be ridden.. .etc
+1 for a different saddle. If you wanna go full hipster put a girvin flexstem on it or something ridiculous like that