Size labels are not standard
A medium from one brand may be longer or taller than a medium from another. Use a numerical table before treating two labels as equivalent.
RideIn geometry lab
Boardman ADV 8.6 geometry and sizing
This reviewed bike is indexed in the RideIn geometry catalogue. Numerical measurements are not shown because a usable model-specific table has not yet been verified.
Gravel · Reviewed specification
Review catalogue entry
The bike has a live RideIn review and its source status is tracked here. A numerical comparison will be enabled only after a model-specific geometry table is verified.
No measurements have been guessed. Use the RideIn review and linked source to identify the exact edition before adding a manufacturer geometry table.
Using this entry
What the available data can and cannot tell you
Confirm the exact edition
Geometry can change between generations, frame styles and regional builds carrying a similar model name.
Use a known bike
Measure or source the stack and reach of a bicycle that already fits, then compare those numbers with the exact candidate size.
Test the complete position
Stem, spacers, handlebar, saddle position and rider mobility still affect fit after the frame size is chosen.