Nike Pegasus 42 vs Nike Pegasus Plus 2:
Which to Choose

The clearest split is the foam. The 42 runs on ReactX, a firm, stable, durability-first midsole that feels businesslike and planted, with pop coming from its full-length curved Air Zoom unit rather than the foam itself. The Plus 2 swaps in full-length ZoomX — Nike's soft, bouncy premium foam — plus an exposed forefoot Air unit and a mild rocker, so it feels springy and eager underfoot but noticeably less settled at jogging speeds. Stack numbers back this up: the Plus 2 is taller at both ends (38mm heel / 28mm forefoot) than the 42 (36mm / 22mm), and that extra forefoot height is where its toe-off snap lives. Drop is the other decider — the 42's tall 14mm, heel-biased offset rewards heel strikers logging steady miles, while the Plus 2's 10mm feels more forward and turnover-friendly. On the scale, the Plus 2 is the lighter shoe at roughly 252g in a men's US 9 versus 286g for the 42, a meaningful ~34g difference you feel when the pace lifts. Neither has a plate and both are neutral with no pronation support, but the 42's wider, firmer platform is the more stable of the two; the Plus 2's soft, tall stack trades that planted security for liveliness. Use cases follow directly: the 42 is happiest on 10K-to-marathon steady long runs and moderate efforts around 5:00–6:00/km, whereas the Plus 2 comes alive at 5K-to-half race efforts, with its sweet spot the 10K at 3:45–4:00/km.