Tool · Calculator
Calculator coming next iteration
This page follows template B from the master concept (§4). The calculator with ETRTO hookless hard-cap is planned as an interactive Astro island. Until then: read the methodology below.
Tire Pressure. Understood.
The half-system-weight-in-psi rule was for 25 mm tires on hooked rims. Different rules apply now. Three inputs matter: system weight, measured tire width, surface. The fourth is the hookless ceiling — not a compromise, a hard cap.
Go deeper
Setup
Tire width
Why 30 mm rolls faster than 25 mm in almost every condition.
Buying guide
Which tires
GP 5000 S TR, Pro One TLE, P Zero Race TLR, Corsa Pro head to head.
Fundamentals
Tubes vs. tubeless
When tubeless pays off, and when TPU tubes are the honest choice.
Purchase decision
Groupset matrix
Shimano 105, SRAM Rival, GRX RX820. Tiers and gravel equivalents on a single map.