What replaced the Adidas Adizero Boston 9?
Updated August 11, 2026. Specs are men's US 9.
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THE SHORT ANSWER
The Adizero Boston 10 replaced the Boston 9 in June 2021 as a full reboot: Boost was dropped for a far taller Lightstrike Pro and Lightstrike stack with EnergyRods in between, about 2 oz heavier and $20 more. Loyalists called it a Boston in name only and bought up remaining 9s instead.
- Adidas Adizero Boston 10Sizes running outMen's at AmazonWomen's
Availability last checked Aug 11, 2026. Prices and stock change without notice.
At a glance
- The Adizero Boston 10 is 2 oz heavier
- 17.5 mm more heel stack
- Drop moved from 9.5 mm to 8 mm
- New midsole foam
- List price up $20
Every spec side by side, with the reason behind each change: Adizero Boston 9 vs 10.
Stay on your shoe, or switch?
A different shoeA total revamp, Believe in the Run's words, and this line's cleanest case of a new shoe wearing an old name. Adidas rebuilt the Boston as a maximal rod-plated trainer, and reviewers split only on whether keeping the name was fair: FueledByLOLZ wrote that Adidas should have renamed it, while Solereview argued retaining the name made sense. Nobody argued it ran like a Boston 9.
Stick with the Adizero Boston 9 if
- You bought Bostons for the low, firm, race-flat feel; the 10 is a tall maximal trainer
- Boost's 500-plus-mile durability was the point for you
- The 8.4 oz weight mattered on race day; the 10 weighs over 10 oz
Old stock is gone; see alternatives below.
Move to the Adizero Boston 10 if
- You want a modern plated trainer for tempo days and long runs
- The 9 always ran too thin under your forefoot past the half marathon
- You are a bigger runner and the 9 bottomed out under you
Where the Adidas Adizero Boston is now
Four generations separate the Adidas Adizero Boston 9 from the Adizero Boston 13 (2025), so the gap is wider than any single update suggests:
- The Adizero Boston 13 is 0.6 oz heavier
- 14.5 mm more heel stack
- Drop moved from 9.5 mm to 6 mm
- New midsole foam
- List price up $40
The 9 to 10 is the cleanest case on this site of a new shoe keeping an old name. Adidas dropped full-length Boost for a much taller Lightstrike Pro stack with rods through the middle, added about 2 oz and $20 to the list price, and turned a low, firm, fast trainer into a maximal plated one. Reviewers argued about whether the name should have moved with it. Nobody argued the two shoes ran alike. If you are here from a 9, treat the 10 as an unrelated purchase and shop it against other plated trainers rather than buying on the name.
What loyalists said about the update
The grief event this line is known for. LetsRun called the 10 a Boston in name only, mourned the glory days of invincible TPU, and openly planned to stockpile clearance 9s, which sold for around $55 for a year after the reboot. The counter-camp liked the new shoe fine; they just agreed it was not a Boston.
Still want the original?
Buy remaining Adizero Boston 9 stock
Old stock goneAmazon's stock of the Adidas Adizero Boston 9 is gone in both men's and women's sizes, and discontinued stock does not come back. The best current match is the Saucony Endorphin Speed 6.
Ready to move on?
Beyond the Adizero Boston 10, these come closest to what the Adizero Boston 9 did.
- 7.8 oz
- 8 mm drop
- 39 mm heel
- $175 list
The Endorphin Speed is the modern Boston's one real category peer: a plated tempo trainer soft enough for daily miles. Its PEBA foam is bouncier and more forgiving than Lightstrike; the Boston counters with outsole durability and a lower list price.
Against your Adidas Adizero Boston 9: 0.6 oz lighter, 17.5 mm more heel stack, 1.5 mm less drop, $55 more at list.
Adidas Adizero Boston vs Saucony Endorphin Speed, side by side
- 7.9 oz
- 5 mm drop
- 37 mm heel
- $145 list
The Mach runs the same daily-plus-tempo brief with no plate, softer foam, and $15 less at list. The usual landing spot when the Boston's firmness is the problem rather than the point.
Against your Adidas Adizero Boston 9: 0.5 oz lighter, 15.5 mm more heel stack, 4.5 mm less drop, $25 more at list.
- 8.8 oz
- 8 mm drop
- 41.5 mm heel
- $155 list
The Novablast answers the same one-fast-trainer question with no plate and much softer foam, and it is far happier at easy paces. Runners who find the Boston punishing below tempo pace tend to land here.
Against your Adidas Adizero Boston 9: 0.4 oz heavier, 20 mm more heel stack, 1.5 mm less drop, $35 more at list.
Questions runners ask
- Is the Adidas Adizero Boston 9 still available?
- No. Amazon's stock of the Adidas Adizero Boston 9 is gone in both men's and women's sizes, and old-model stock does not come back. Your move is the successor or a close alternative.
- Is the Adizero Boston 10 a downgrade from the Adidas Adizero Boston 9?
- Treat the Adizero Boston 10 as a new model that borrowed the name. Very little of the Adidas Adizero Boston 9's ride carries over, so shop it against alternatives rather than buying on loyalty.
- How much heavier is the Adizero Boston 10?
- 2 oz heavier in a men's US 9: 10.4 oz against the Adidas Adizero Boston 9's 8.4 oz.
- Did the drop change from the Adidas Adizero Boston 9 to the Adizero Boston 10?
- Yes, from 9.5 mm to 8 mm. A drop change this size affects where your foot loads at landing, so plan a few easy runs to adapt.
- Is the Adidas Adizero Boston still made?
- Yes. The current version is the Adidas Adizero Boston 13, released in 2025, 4 versions on from the Adidas Adizero Boston 9.
- What is the closest current alternative to the Adidas Adizero Boston 9?
- The Saucony Endorphin Speed 6. The Endorphin Speed is the modern Boston's one real category peer: a plated tempo trainer soft enough for daily miles. Its PEBA foam is bouncier and more forgiving than Lightstrike; the Boston counters with outsole durability and a lower list price.