Which is lighter, the Brooks Adrenaline GTS 20 or the Adrenaline GTS 21?

The Adrenaline GTS 21, by 0.2 oz in a men's US 9 (10.4 oz vs 10.6 oz).

Do the Brooks Adrenaline GTS 20 and Adrenaline GTS 21 come in the same widths?

Yes. Both run in B, D, 2E, 4E for men's sizes, so a width that fit in the Adrenaline GTS 20 carries over to the Adrenaline GTS 21.

How do the stack heights compare?

36 mm heel and 24 mm forefoot on the Brooks Adrenaline GTS 20, against 36 mm and 24 mm on the Adrenaline GTS 21. Same platform under both.

Is the Adrenaline GTS 21 still the newest Adrenaline GTS?

No. The Adrenaline GTS 22 replaced it in 2021, so the Adrenaline GTS 21 now sells as an older model and usually below its $130 list price.

Brooks Adrenaline GTS 20 vs Adrenaline GTS 21

Updated July 29, 2026. Specs are men's US 9.

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Refined, same shoe

THE SHORT ANSWER

The Adrenaline GTS 21, by default. Amazon's Brooks Adrenaline GTS 20 stock is gone in both men's and women's sizes, so what follows is a record of what changed, not a choice you still have.

Adrenaline GTS 20 · 2019

Adrenaline GTS 21 · 2020

Every spec, side by side

Spec	Adrenaline GTS 20	Adrenaline GTS 21
FIT AND WEIGHT
Weight	10.6 oz	10.4 oz
Widths	B, D, 2E, 4E	B, D, 2E, 4E
Upper	Engineered air mesh, midfoot overlays removed	Lighter, more breathable engineered air mesh with 3D Fit Print
CUSHIONING GEOMETRY
Heel stack	36 mm	36 mm
Forefoot stack	24 mm	24 mm
Drop	12 mm	12 mm
MATERIALS
Midsole	BioMoGo DNA with a DNA Loft crash pad in the heel	Full-length DNA Loft over a BioMoGo DNA base
	The headline change. Transitions got softer and smoother without touching the GuideRails.
VALUE
List price at launch	$130	$130

Weighing whether to switch at all, rather than which of these two to buy? What replaced the Brooks Adrenaline GTS 20 covers the verdict on the update, what loyalists made of it, and the closest alternatives from other brands.

Buy the Adrenaline GTS 20

Old stock gone

Amazon's stock of the Brooks Adrenaline GTS 20is gone in both men's and women's sizes, and discontinued stock does not come back.

Old stock is gone. See what replaced it

Buy the Adrenaline GTS 21

Sizes running out

Discontinued at retail. Amazon carries what remains, so treat an in-stock size as a closing window, and expect prices to swing.

Men's stock is gone.

Women's: Check remaining stock

Availability last checked Jul 29, 2026.

Questions runners ask

Which is lighter, the Brooks Adrenaline GTS 20 or the Adrenaline GTS 21?: The Adrenaline GTS 21, by 0.2 oz in a men's US 9 (10.4 oz vs 10.6 oz).
Do the Brooks Adrenaline GTS 20 and Adrenaline GTS 21 come in the same widths?: Yes. Both run in B, D, 2E, 4E for men's sizes, so a width that fit in the Adrenaline GTS 20 carries over to the Adrenaline GTS 21.
How do the stack heights compare?: 36 mm heel and 24 mm forefoot on the Brooks Adrenaline GTS 20, against 36 mm and 24 mm on the Adrenaline GTS 21. Same platform under both.
Is the Adrenaline GTS 21 still the newest Adrenaline GTS?: No. The Adrenaline GTS 22 replaced it in 2021, so the Adrenaline GTS 21 now sells as an older model and usually below its $130 list price.