I have been an avid road cyclist for more than 25 years.

I would like to think that I have a good basic understanding of frame geometry, but with the movement towards compact frames I feel like my knowledge is moldy. I still think in terms of Top Tube, Seat Tube, Head Tube lengths...and HT angle/ST angle.

However I have been hearing more lately that since manufacturers are lying about their geometries it makes more sense to look at "stack" and "reach."

I want to learn a bit more about this but I suspect it will require a change in my thinking.

Anyone know a good website to help me convert my old math (geometry) thinking into the 21st century??