Brooks Ghost vs Glycerin Cut in Half: Real Lab Specs and Foam Measurements
By Sophia Al-Mansoor
Manufacturer spec sheets often list stack heights based on sample molds without accounting for the strobel board or sockliner compression. Independent caliper readings, taken in strict compliance with World Athletics measurement protocols, reveal meaningful discrepancies between marketed claims and road-contact reality.
The Brooks Ghost 18 sits at an actual heel stack height measurement of 35.6 mm, paired with a forefoot stack of 24.4 mm. This yields a net heel-to-toe drop of 11.2 mm. For heel strikers, this steep slope shifts load away from the Achilles tendon and soleus complex, directing impact forces toward the larger musculature of the quadriceps and hips.
By contrast, the Brooks Glycerin 23 elevates the foot to a 38.2 mm heel stack and a 28.4 mm forefoot platform. The resulting offset calculates to 9.8 mm. While nominally marketed in the traditional 10 mm bracket, the extra 4 mm of foam under the metatarsals fundamentally alters toe-off mechanics. Runners who land midfoot encounter immediate dampening beneath the ball of the foot, preventing the abrupt bottoming-out sensation that high-mileage athletes often report in standard daily trainers.
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