Can I go straight from the Brooks Glycerin 18 to the Glycerin 20 and skip the Glycerin 19?

Yes, but going Glycerin 18 to Glycerin 20 means taking one change in a single step: the Glycerin 20 is where the ride moved. Drop holds at 10 mm, so the difference is foam and fit rather than geometry: DNA Loft to Nitrogen-infused DNA Loft v3.

How much did the weight change across these two updates?

0.3 oz on in total, 10.2 oz to 10.5 oz in a men's US 9. Almost all of it came in the second update; the Glycerin 19 weighed 10.2 oz.

Is the Glycerin 19 the better buy than either of these?

On paper it splits them: 10.2 oz against 10.2 oz for the Glycerin 18 and 10.5 oz for the Glycerin 20, on a 31 mm heel and a $150 list price. Availability decides it: Amazon's Glycerin 19 stock is gone in both men's and women's sizes, so it is not a live option.

Did the Glycerin get taller between the Glycerin 18 and the Glycerin 20?

Heel stack went 31 mm to 34 mm, by way of 31 mm on the Glycerin 19. Drop held at 10 mm throughout, so the extra foam sits under both ends.

Where does the Glycerin 20 sit in the Glycerin lineup now?

Two versions on from the Glycerin 18, and already replaced itself: the Glycerin 21 arrived in 2023. If you are shopping old stock anyway, price the Glycerin 20 against it before deciding.

Brooks Glycerin 18 vs Glycerin 20

Two versions apart. Updated September 10, 2026. Specs are men's US 9.

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THE SHORT ANSWER

Two updates and 2 years separate the Brooks Glycerin 18 from the Glycerin 20. Net change: 0.3 oz heavier, 3 mm more heel stack, a new midsole, $10 more at list. The Glycerin 20 is where the character changed, and that is the update Glycerin 18 owners notice first.

Brooks Glycerin 20Sizes running outMen's at Amazon Women's

Availability last checked Aug 3, 2026. Prices and stock change without notice.

Glycerin 18 · 2020

Glycerin 20 · 2022

The two updates in between

Each step has its own page with the full change list and the verdict on that update.

Step 1Glycerin 18 to Glycerin 192021Refined, same shoe
Glycerin 18 vs 19 What replaced the Brooks Glycerin 18?
Step 2Glycerin 19 to Glycerin 202022Changed character
Glycerin 19 vs 20 What replaced the Brooks Glycerin 19?

Glycerin 18 vs Glycerin 20: every spec, side by side

The net of both updates. Per-update change notes stay on the step pages above, because they explain changes measured from a different starting point than this table uses.

Spec	Glycerin 18	Glycerin 20
FIT AND WEIGHT
Weight	10.2 oz	10.5 oz
Widths	D, 2E	D, 2E
Upper	Double-jacquard mesh with 3D Fit Print	Engineered mesh (StealthFit knit variant also offered)
CUSHIONING GEOMETRY
Heel stack	31 mm	34 mm
Forefoot stack	21 mm	24 mm
Drop	10 mm	10 mm
MATERIALS
Midsole	DNA Loft	Nitrogen-infused DNA Loft v3
VALUE
List price at launch	$150	$160

Or buy the Glycerin 19 instead?

The Glycerin 19 is not a live option: Amazon's stock is gone in both men's and women's sizes. This is a two-shoe decision between remaining Glycerin 18 pairs and the Glycerin 20.

Buy the Glycerin 19

Old stock gone

Amazon's stock of the Brooks Glycerin 19 is gone in both men's and women's sizes, and discontinued stock does not come back.

Old stock is gone. See what replaced it

Questions runners ask

Can I go straight from the Brooks Glycerin 18 to the Glycerin 20 and skip the Glycerin 19?: Yes, but going Glycerin 18 to Glycerin 20 means taking one change in a single step: the Glycerin 20 is where the ride moved. Drop holds at 10 mm, so the difference is foam and fit rather than geometry: DNA Loft to Nitrogen-infused DNA Loft v3.
How much did the weight change across these two updates?: 0.3 oz on in total, 10.2 oz to 10.5 oz in a men's US 9. Almost all of it came in the second update; the Glycerin 19 weighed 10.2 oz.
Is the Glycerin 19 the better buy than either of these?: On paper it splits them: 10.2 oz against 10.2 oz for the Glycerin 18 and 10.5 oz for the Glycerin 20, on a 31 mm heel and a $150 list price. Availability decides it: Amazon's Glycerin 19 stock is gone in both men's and women's sizes, so it is not a live option.
Did the Glycerin get taller between the Glycerin 18 and the Glycerin 20?: Heel stack went 31 mm to 34 mm, by way of 31 mm on the Glycerin 19. Drop held at 10 mm throughout, so the extra foam sits under both ends.
Where does the Glycerin 20 sit in the Glycerin lineup now?: Two versions on from the Glycerin 18, and already replaced itself: the Glycerin 21 arrived in 2023. If you are shopping old stock anyway, price the Glycerin 20 against it before deciding.