Does the DENSO U24ESR-NB fit the BMW C1 125 (1999–2003)?
Yes — the DENSO U24ESR-NB is a correct fitment for the BMW C1 125 (1999–2003).
Last verified: 22 July 2026 against 2 independent sources (Cross-brand plug correspondence (NGK + Denso catalogues), Denso Motorcycle Spark Plug Catalogue (official PDF)).
Brakes are safety-critical. Always confirm fitment against your owner's manual before purchase and installation.