- Road
- Drop-bar bikes built for paved surfaces, including endurance, race, and all-road frames with road geometry.
- Mountain
- Flat-bar off-road bikes with suspension, including hardtail and full-suspension trail, XC, enduro and downhill.
- Gravel
- Drop-bar bikes built for mixed surfaces, with wider tyres and longer wheelbases than road bikes.
- E-bike
- Any pedal-assisted bike, across road, mountain, hybrid, cargo and folding formats.
- Mean asking price
- The arithmetic average of every advertised asking price in a category for the period. This is the Autotrader-style headline figure.
- Month-on-month change
- The percentage difference between the current period’s mean asking price and the previous period’s, both on the chain-linked series.
- Chain-link adjustment
- When a new data source is added mid-window, pre-source months are scaled by the ratio of the two baskets observed during the overlap month. Eliminates the visual cliff that would otherwise appear when the source mix changes. Standard methodology used in published retail price indices.
- Margin of error
- The ±95% sampling uncertainty on a month’s mean, estimated from that month’s price spread and sample size. Monthly moves inside it are reported as flat.