The Cyclesite Used Bike Price Index is a public data product that tracks closing prices for used bicycles sold through the Cyclesite marketplace in the United Kingdom. This page documents the methodology so that journalists, researchers, dealers and private buyers can understand how the index is calculated before citing it. The index is constructed from first-party transaction data — every completed sale on Cyclesite becomes an immutable snapshot at the point of escrow release, recording sale price, original list price, days-to-sell, bike category, brand, model, year, condition, frame material, groupset, location and listing type. Because the data comes from actual transactions rather than asking prices, it sits closer to reality than the asking-price averages published by general marketplaces, where listing prices typically run 15-25% above final closing figures. Sample construction. Each monthly index value is the median of sale prices within a defined segment over the trailing 90-day window, calculated per bike category (road, mountain, electric, gravel, hybrid, folding, kids, and the minor categories) and separately per top-25 brand by transaction volume. Median is used rather than mean to suppress the effect of outliers — a single £12,000 bespoke build does not move the index for "used road bikes" upwards. We publish the sample size alongside every index value and mark any segment with fewer than 10 transactions in the window as "insufficient sample" rather than reporting a potentially unreliable figure. Segments that repeatedly fail the sample threshold are omitted from the headline index and relocated to a "narrow segments" appendix. Exclusions. We exclude the following from the headline index: auction sales with a reserve that was not met, cancelled transactions, disputed transactions where the dispute was upheld in the buyer's favour, test transactions by Cyclesite staff, and transactions where the listing was flagged for fraud before or after sale. Frame value adjustments (e.g., kit-only sales) are excluded because they do not represent a complete used bike. Bulk sales from dealer exports are recorded separately and do not feed the private-market index. Refresh cadence. The index is updated monthly on the first working day of each calendar month, covering the trailing 90-day window. We publish a methodology change log for any adjustment to sample construction, exclusions, or categorisation so that historical comparisons remain honest. The index dashboard and methodology PDF are freely available to read, link, and cite under a Creative Commons BY licence — attribution requested with a link back to this page. Launch status. The Cyclesite marketplace launches publicly on 24 April 2026. The first full index value requires a minimum of 30 days of transaction data, so the inaugural monthly report will be published in June 2026 covering the May window. Until then, this page describes the methodology; it does not publish numbers. That distinction matters because we would rather delay a number by a month than publish one built on an insufficient sample. Related products. Once the marketplace is live and data has accumulated, this page will host the live index values, the monthly PDF report, a visual dashboard broken out by category/brand, and the downloadable dataset. Sibling reports on the same data foundation include the annual UK Bike Depreciation Report (how much value bikes lose over 1, 3, 5 and 10 years by category and brand) and the quarterly UK Used Bike Resale Market report (supply, demand, time-to-sell, and regional variation).
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