Free Online Calculators
Calculate ideal tire pressure instantly with SILCA calculator. Get accurate PSI for road, gravel & MTB for better speed, grip & comfort.
Enter your setup below for front and rear PSI and bar. Always stay within rim and tire pressure limits.
Enter total weight, tire width, and every option, then click Calculate for front and rear PSI and bar.
How useful was this calculator for you?
This professional cycling pressure tool is built on SILCA's real-world research and wind tunnel testing data. It calculates separate front and rear PSI for road bikes, gravel bikes, MTB, and cyclocross. It supports clincher, tubeless, and TPU tube setups.
Unlike basic pressure charts, this PSI calculator factors in eight variables simultaneously. Weight distribution on a bicycle is never equal, so your front and rear tires always need different pressures. The tool handles this automatically.
Real-world testing shows that even a 2 PSI adjustment can completely change your ride feel, especially on rough or mixed surfaces.
From real-world riding, slightly lowering PSI on rough roads improves comfort without sacrificing speed. That is a small change most riders overlook.
Core logic:
PSI = (System Weight x Weight Distribution %) / (Contact Patch Factor x Surface Coefficient)
Recalculate whenever you switch surfaces or seasons.
Use this as a quick reference before calculating your exact PSI:
| Bike type | Tire setup | Front PSI | Rear PSI |
|---|---|---|---|
| Road bike | Clincher (butyl) | 72-88 | 78-95 |
| Road bike | Tubeless | 65-80 | 70-85 |
| Gravel bike | Tubeless | 28-38 | 32-42 |
| Gravel bike | Clincher | 35-48 | 40-52 |
| MTB hardtail | Tubeless | 20-28 | 22-30 |
| MTB full suspension | Tubeless | 18-25 | 20-27 |
| Cyclocross | Tubeless | 25-33 | 28-36 |
| Hookless rim | Tubeless only | Max 73 PSI | Max 73 PSI |
Always cross-check against your rim and tire manufacturer's maximum rating.
It is highly accurate when you enter correct inputs, especially actual mounted tire width, not labeled width. Results land within 2-3 PSI of optimal pressure for most riders. Accuracy drops only when users enter estimated weights or incorrect surface categories.
Yes. Tubeless mode automatically reduces PSI by 5-10 compared to clincher baseline. Tubeless tires deform more efficiently at lower pressure, which cuts rolling resistance and improves cornering grip without pinch flat risk.
SILCA factors in more variables: surface category, casing type, riding speed, and weight distribution. SRAM AXS mainly uses rider weight and tire width. Most experienced riders agree that SILCA gives more terrain-specific results, especially for gravel and MTB riding.
Yes. It uses MTB-specific weight distribution (46.5/53.5) and adjusts for aggressive terrain. For full suspension setups, always run the lower end of the suggested PSI range for better traction and control on technical trails.
Select tubeless tire type. Hookless rims are incompatible with inner tubes at performance pressures. The tool automatically caps output at 73 PSI (5 bar) to comply with ETRTO hookless safety standards. Never override this limit.
Because weight distribution on a bicycle is never equal. Road bikes place about 48% of load on the front wheel and 52% on the rear. Running equal pressure on both increases rear rolling resistance and reduces front-end grip at the same time.
There is no standalone app currently available. The tool runs as a fully mobile-optimized web calculator with no download or account required. It works smoothly on all smartphones and tablets without any setup.
Use this professional bike tire pressure calculator before every ride to maximize speed, comfort, and grip. Enter your system weight, actual tire width, surface type, and tire setup to get precise front and rear PSI instantly. Even a small 2 PSI change can significantly impact your performance on road, gravel, or trail.
Recalculate your PSI whenever your weight, terrain, or tire setup changes to always maintain optimal performance.
Always verify output against your rim and tire manufacturer's stated maximum PSI, especially on hookless setups.