How it works
Enter your metrics below. The algorithm calculates a base pressure based on the total load (Rider + Bike), splitting the distribution to account for mountain bike geometry (typically putting more weight on the rear wheel). It then applies modifiers based on tire volume, whether you use tubes (which require higher pressure to avoid pinch flats), and the terrain surface.
1. Weight & Units
2. Wheel & Tire Specs
3. Setup & Terrain
Tubed setups require higher pressure to prevent "snakebite" pinch flats.
Your Ideal Pressure
The Physics of Your Setup
Why did you get these specific numbers? Tire pressure isn't a one-size-fits-all metric. It's a dynamic equation balancing grip, rolling resistance, and rim protection. Here is how your specific setup modified the baseline calculation.
📉 Front vs. Rear Split
When riding a mountain bike, your weight is not distributed 50/50. Typically, 60% of the load is on the rear wheel. A lower front pressure maximizes the contact patch for crucial steering grip, while higher rear pressure prevents rim strikes on square-edge hits and supports your weight during pedaling.
🔄 Tubes vs. Tubeless
Because you are running tubes, we automatically add several PSI to your baseline. When hitting rocks at low pressures, the tire compresses to the rim. Without tubes, this is fine. With tubes, the rim acts like a guillotine, causing two small holes known as a "pinch flat" or "snakebite."
🛣️ Surface Adjustments
Pavement/Hardpack: Higher pressures are calculated to reduce rolling
resistance and tire wear on smooth, hard surfaces.
Roots/Rocks/Loose: Lower pressures allow the tire to conform
around obstacles, acting as micro-suspension and massively increasing traction.