diff --git a/.changeset/better-glasses-spend.md b/.changeset/better-glasses-spend.md
new file mode 100644
index 0000000000..a772bbff98
--- /dev/null
+++ b/.changeset/better-glasses-spend.md
@@ -0,0 +1,5 @@
+---
+'@solid-design-system/tokens': minor
+---
+
+Fixed missing `spacing-5` and `spacing-2.5` tokens by merging sizing and spacing tokens for development.
diff --git a/packages/tokens/scripts/tailwind/index.js b/packages/tokens/scripts/tailwind/index.js
index f3565fe49a..fb7050d012 100644
--- a/packages/tokens/scripts/tailwind/index.js
+++ b/packages/tokens/scripts/tailwind/index.js
@@ -255,6 +255,15 @@ function buildSpacing(themeTokens, rawSpacing = {}) {
     spacing[key] = `var(--${token.name})`;
   }
 
+  // Merge sizing tokens — sizing and spacing share the same numeric scale
+  for (const token of themeTokens) {
+    if (!token.name.startsWith('sd-sizing-')) continue;
+    const key = token.name.slice('sd-sizing-'.length);
+    if (!(key in spacing)) {
+      spacing[key] = `var(--${token.name})`;
+    }
+  }
+
   // Fill gaps with raw values from tokens.json (not CSS vars, so use the value directly)
   for (const [key, value] of Object.entries(rawSpacing)) {
     if (!(key in spacing)) {