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Shimano's range is a ladder — on the road it runs 105 → Ultegra → Dura-Ace, and on the mountain Deore and SLX → XT → XTR, with the same engineering trickling down each tier. Shop by category: cassettes, rear derailleurs, pedals, chains and bottom brackets — or compare with SRAM.
Quick guide: keep every drivetrain part at the same speed; 12-speed HYPERGLIDE+ chains and cassettes are engineered as a pair; on cassettes, check your freehub type — HG spline for road, Micro Spline for 12-speed MTB.
Yes — brand new and unopened in original Shimano retail packaging.
105 (road) and SLX/XT (MTB) deliver most of the flagship performance for far less; Dura-Ace and XTR are the race-day picks.
Shimano's 12-speed tooth profiling that lets the chain shift smoothly under power, in both directions — it works best when chain and cassette are both HYPERGLIDE+.