ShoeGeometry

On Cloudultra Pro vs Saucony Xodus Ultra 4

Two shoes compared on measured geometry. Each cell carries a provenance badge; open a shoe for sources.

heel boneOn Cloudultra Pro: heel 39 mm, forefoot 33 mm (drop 6 mm); toe rocker 40 % of length, radius 63 % of length; heel bevel 15 % of length, 21 mm high at the back, reaching in front of the heel bone (the sole still curves up under it: a heel rocker).On Cloudultra Pro: toe rocker 40 % of lengthSaucony Xodus Ultra 4: heel 38 mm, forefoot 32 mm (drop 6 mm); toe rocker 37 % of length, radius 46 % of length; heel bevel 14 % of length, 9 mm high at the back, ending about under the heel bone.Saucony Xodus Ultra 4: toe rocker 37 % of length
  • On Cloudultra Pro39/33 mm · toe rocker 40 % · heel bevel 15 %
  • Saucony Xodus Ultra 438/32 mm · toe rocker 37 % · heel bevel 14 %
Illustrative profiles, not photographs: drawn from published stack heights and photo estimates of the unloaded shoes on a common length (300 mm), heels aligned, toe to the left; dots mark where each toe rocker starts; the dotted vertical line is under the heel bone (12 % of length), so a heel curve reaching past it is a bevel in front of the heel bone. Dotted lines use typical values where a shoe has no measurement. Exact values are in the table below.

Which suits you

If you wantPickBecause
A smoother roll at toe-offSaucony Xodus Ultra 439.5 vs 37.1 % toe rocker; 36.3 vs 45.1 mm toe tip
More cushioning under the heelAbout the same38.5 vs 38 mm heel stack
More under the forefootAbout the same32.5 vs 32 mm forefoot stack
A lower dropAbout the same6 vs 6 mm drop
A stiffer, snappier forefootAbout the same34 vs 38 /100 stiffness
A firmer, more stable feelAbout the same59 vs 56 /100 firmness
A wider base under the forefootAbout the same117.3 vs 116.7 mm forefoot base

From the values below, with differences inside measurement noise shown as about the same. This describes the shoes, not what is right for your feet; comfort in the first few runs decides.

MetricOn Cloudultra Pro
Trail · Trail
Saucony Xodus Ultra 4
Trail · Trail
Heel-to-toe drop6 mmStated6 mmStated
Heel stack38.5 mmStated38 mmStated
Forefoot stack32.5 mmStated32 mmStated
Weight264 gStated—
Toe rocker40 %est.37 %est.
Rocker radius63 %est.46 %est.
Rocker rise angle24 degest.28 degest.
Rocker angle at toe64 degest.55 degest.
Toe tip over ground36 mmest.45 mmest.
Visible rocker lift onset72.2 %est.76.1 %est.
Toe spring (relative)17.6 %est.20.2 %est.
Heel bevel length15.3 %*est.13.9 %est.
Heel bevel height21 mm*est.9 mm*est.
Midsole width (forefoot)117.3 mmMeasured116.7 mmMeasured
Midsole width (heel)91.6 mmMeasured97.3 mmMeasured
Toe box shape75 %est.—
Interior forefoot width94.6 mmMeasured96.6 mmMeasured
Toebox width74.6 mmMeasured71.6 mmMeasured
Longitudinal stiffness34Derived38Derived
Midsole firmness59Derived56Derived
PlatePlate unknownNo plate
Primary foamDual-layer Helion HF (PEBA-based)PWRRUN PB
List price$260$170

Key differences

  • Heel-to-toe drop is about the same: 6 mm for On Cloudultra Pro, 6 mm for Saucony Xodus Ultra 4.
  • Heel stack is about the same: 38.5 mm for On Cloudultra Pro, 38 mm for Saucony Xodus Ultra 4.
  • Forefoot stack is about the same: 32.5 mm for On Cloudultra Pro, 32 mm for Saucony Xodus Ultra 4.
  • Toe rocker is about the same: 40 % of length for On Cloudultra Pro, 37 % of length for Saucony Xodus Ultra 4.

Read more about both shoes

We measure the shape. For how they feel over many miles, and for lab tests of cushioning, grip and fit:

On Cloudultra Pro

Saucony Xodus Ultra 4

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On Cloudultra Pro details · Saucony Xodus Ultra 4 details · Add more shoes