Asics GT-1000 14 vs Asics GT-1000 15:
Which to Choose

These two are about as close as a predecessor and successor get. Both run a low-profile, firm platform — roughly 35mm at the heel and 25mm at the forefoot (the 14 measures about 35.4/25.8mm, the 15 about 35/25mm) — so cushioning depth is effectively identical, and neither is a plush recovery shoe. Weight is a wash too: the 14 comes in around 272g and the 15 around 278g, a difference you won't feel underfoot. Drop is another non-event; both are advertised at 8mm and both actually measure closer to 9.6–10mm, giving the same traditional, heel-biased geometry that rewards heel strikers. Stability is rated identically high on both, with the same medial guidance resisting inward roll, and both carry the same PureGEL rearfoot unit to soften heel landings. Where the 15 genuinely moves the needle is durability and fit: it swaps the 14's AHAR outsole for a tougher AHARPLUS compound that should extend tread life, its engineered mesh upper has been redesigned for breathability, and its platform is marginally broader for a touch more structure. Ride feel, foam, cushioning, and pace range — optimal around 5:30–6:30 min/km, topping out near 5:15–5:30 — carry over essentially unchanged.