British-origin classic motorcycles.
For decades Britain WAS the motorcycle industry — Triumph, Norton, BSA and Vincent defined the sports motorcycle. Vertical twins, café-racer culture and the ton-up boys were born here. The Japanese onslaught of the 1970s destroyed the industry commercially, but the machines endure as icons of a lost golden age, sustained today by the best parts and club support of any classic category.
Origin: United Kingdom · vertical twins and café-racer culture · icons of a lost golden age.
The definitive British twin, 1959.
Isolastic-framed swan-song, 1968.
The pre-war superbike, 1948.
Below: every constituent with live pricing plotted along the € axis. Each amber mark is one model's current median price.
| Years | Liquidity | |||
|---|---|---|---|---|
Models are assigned to R-GBR by marque origin, era and segment. Every tracked model with sufficient listings contributes.
For each constituent we compute a monthly median from observed European listings and auction results, requiring at least three observations in a month before a median is published — thin months are left blank rather than estimated.
R-GBR is equal-weighted across constituents with published medians, rebased to 100 at its base month. The index level moves via chain-linking: month-to-month it reflects the price change of constituents present in both months.
Where the index has few months of overlapping data, its level stays near its base and we say so. Index history deepens as our weekly collection accumulates — we show current composition until the series is meaningful.
Full methodology paper available free in Reports.