Wheels and tires
Pressure, spokes, sealant, ETRTO and circumference.
- Tire Pressure CalculatorWider tyres and lighter riders want less pressure. This splits system weight 45% front and 55% rear, then scales for gravel and MTB. It is a starting pump figure, not a Silca pressure table.
- Spoke Length CalculatorEnter the rim ERD and one hub flange. Left and right flanges often differ on a rear hub or a disc hub, so calculate each side.
- Tubeless Sealant CalculatorSealant has to coat the casing. A 28 mm road tyre needs far less than a 2.4 inch trail tyre. Refresh it when it dries, not only when you first mount the tyre.
- Rim and Tire ETRTO CheckerInner rim width and tyre width have to agree. Too narrow a tyre on a wide rim comes off in a corner; too wide a tyre on a narrow rim squirms.
- Wheel Circumference CalculatorGPS computers still want a wheel circumference when you use a speed sensor. The figure is the full circle of the loaded tyre, approximated here from bead seat plus two labelled widths.