Suspension and MTB setup
Sag, coil rate, rotors and flip chips.
- Fork Sag and PSI CalculatorSag is how far the fork sits into its travel with you in riding position. Trail bikes often start near 20%. The PSI figure is a generic air-spring guess for a mid-travel fork, not a Fox or RockShox chart.
- Rear Shock Spring Rate CalculatorA coil has one rate. This estimates the lb/in that sags the requested percent of stroke with about 70% of rider weight on the rear wheel.
- Brake Rotor Size CalculatorBigger rotors add leverage and heat capacity. The recommendation follows discipline first, then bumps the front rotor if a road or gravel rider is heavier.
- Flip-Chip Geometry CalculatorMany trail frames ship a high and a low chip. This applies a typical delta — half a degree of head angle and 6 mm of bottom-bracket height — so you can see the low setting before you pull the pivot.