diff --git a/src/client/render/gl/shaders/map-overlay/trail.frag.glsl b/src/client/render/gl/shaders/map-overlay/trail.frag.glsl
index 0e10966de..da97519f6 100644
--- a/src/client/render/gl/shaders/map-overlay/trail.frag.glsl
+++ b/src/client/render/gl/shaders/map-overlay/trail.frag.glsl
@@ -68,12 +68,10 @@ void main() {
     } else {
       // gradient — cyclic gradient banded across the map (world-space diagonal),
       // scrolling over time so a moving trail shifts hue along it. colorSize
-      // scales the band width (colorSize = 1 ≈ 4 tiles per band); movementSpeed
-      // = tiles/sec the bands travel.
+      // = band width in tiles; movementSpeed = tiles/sec the bands travel.
       float colorSize = max(texelFetch(uEffect, ivec2(o, rowBase + 2), 0).a, 0.001);
       float movementSpeed = texelFetch(uEffect, ivec2(o, rowBase + 3), 0).a;
-      // 4.0 = tiles per band at colorSize 1; tune for default band thickness.
-      float cycle = colorSize * 4.0 * float(count);
+      float cycle = colorSize * float(count);
       float phase =
         fract((vWorldPos.x + vWorldPos.y - uTime * movementSpeed) / cycle);
       float f = phase * float(count);
diff --git a/src/client/render/gl/shaders/structure/structure.frag.glsl b/src/client/render/gl/shaders/structure/structure.frag.glsl
index e20ecb887..fe0d5c1c9 100644
--- a/src/client/render/gl/shaders/structure/structure.frag.glsl
+++ b/src/client/render/gl/shaders/structure/structure.frag.glsl
@@ -84,13 +84,13 @@ bool structuresEffectColor(int owner, out vec3 color) {
     // gradient is visible across the shape (world-space banding like the
     // trail's would put the entire icon inside one band and read as a flat
     // color). It scrolls along the diagonal at the trail-equivalent pace:
-    // one full slide every colorSize · 4 · count / movementSpeed seconds,
+    // one full slide every colorSize · count / movementSpeed seconds,
     // so both knobs keep their trail timing semantics.
     float colorSize = max(texelFetch(uEffect, ivec2(owner, rowBase + 2), 0).a, 0.001);
     float movementSpeed = texelFetch(uEffect, ivec2(owner, rowBase + 3), 0).a;
     float dn = (vLocalPos.x + vLocalPos.y) * 0.5; // icon diagonal, -0.5..0.5
     float phase =
-      fract(dn - uTime * movementSpeed / (colorSize * 4.0 * float(count)));
+      fract(dn - uTime * movementSpeed / (colorSize * float(count)));
     float f = phase * float(count);
     int i = int(f) % count;
     int j = (i + 1) % count;
diff --git a/src/core/CosmeticSchemas.ts b/src/core/CosmeticSchemas.ts
index 77b9f3734..c88be56af 100644
--- a/src/core/CosmeticSchemas.ts
+++ b/src/core/CosmeticSchemas.ts
@@ -233,7 +233,7 @@ const NukeExplosionEffectSchema = CosmeticSchema.extend({
 // separate schema, and the spatial semantics differ:
 //  - "gradient": the palette spans each structure icon's diagonal once (a
 //    visible gradient across the shape), sliding one full cycle every
-//    colorSize · 4 · count / movementSpeed seconds (the trail-equivalent pace).
+//    colorSize · count / movementSpeed seconds (the trail-equivalent pace).
 //  - "transition": the whole icon is one color at a time, cross-fading through
 //    the list. `frequency` = color changes per second.
 // Colors are unvalidated strings; the renderer drops any it can't parse (and