A stack-to-reach ratio in the 1.45–1.55 range puts you in endurance territory, meaning a more upright, comfortable riding position compared to a full-on race bike. You'll sit taller relative to how far you stretch forward, which takes pressure off your back, neck, and shoulders during long hours in the saddle.
This ratio is ideal for gran fondos, century rides, and long training days where comfort matters more than squeezing out every last aerodynamic advantage. Most recreational road riders actually gravitate toward this range because it balances speed with all-day rideability — you can still ride briskly, but you won't feel wrecked after four or five hours.
The trade-off is a slight aero penalty at higher speeds, which matters most if you're racing or chasing fast group rides. But for the majority of riders logging steady miles, the comfort gains far outweigh that small difference.