File written to posts/2026-05-12-trek-mountainbike-29-zoll-alu-21-gang-kaufen-ebay-de.md. ~490 words, covers: price range, frame sizing, pre-buy checklist, theft check, what to avoid.
File written to posts/2026-05-12-trek-mountainbike-29-zoll-alu-21-gang-kaufen-ebay-de.md. ~490 words, covers: price range, frame sizing, pre-buy checklist, theft check, what to avoid.