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Onitsuka Tiger Mexico 66
Sizing & fit guide

Our verdict
Go ½ size down
The Onitsuka Tiger Mexico 66 runs long and narrow. Most regular and narrow-footed wearers size down a half from their usual US size for a snug, clean fit — the recurring advice is "they run long, size down .5 from true to size." Wide feet are the exception: don't size down, stay true to size for toe-box room, because the narrow, slightly pointy last is the shoe's main limitation.
Medium confidence

Two ways to fit it

Regular and narrow feet should size down a half — the Mexico 66 runs long, and a half-down gives the snug, intended fit. Wide feet should stay true to size for toe-box room, since sizing down into the narrow last makes width worse.

Tighter, cleaner fit
Go ½ size down
Relaxed / wide-foot fit
True to size

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Why the Onitsuka Tiger Mexico 66 fits this way

The Mexico 66 is a thin, low-profile retro runner, and two themes come up over and over: it runs long, and it runs narrow. On length, the most specific advice is to size down — "Size down .5 from TTS, I have a pair and they run long" and "you should be able to go down a half size." Coming from Adidas, owners report going down: "Half size down for me — I wear 8 in Tigers, 8.5 in Adidas." A long-time owner with seven pairs sums up the nuance: "Mexico 66 are pretty true to size in my experience… if you feel like you have a bit of room to move in them, maybe go half a size smaller." So true-to-size works, but a half-down is the snugger, more popular choice for regular and narrow feet.

The narrowness is the bigger caveat. The last is "super narrow and a bit pointy," and the toe box is "pretty narrow compared to most sneakers." That's great for narrow feet and the intended snug look, but it's the reason wide feet struggle. Crucially, sizing up to chase width backfires on length: "I got half a size up because I had wider feet, but all it did was make it loose from the back," and "half a size more and my foot kept coming off." Because the shoe runs long, going up just adds heel slip without fixing the narrow forefoot.

These are leather shoes that start stiff and break in — early toe pain and tightness are common and ease after a week or two of wear as the leather softens. Net: runs long and narrow. Regular and narrow feet should size down a half for a snug fit; wide feet should stay true to size for toe room, lace snugly to limit heel slip, and accept that the narrow last may never feel roomy.

Common scenarios

I wear US 9 in most sneakers. What size Mexico 66?

Try US 8.5. The Mexico 66 runs long, so most regular and narrow feet size down a half for a snug fit. If you have wide feet, stay at US 9 — the toe box is narrow and sizing down only makes the width worse.

I'm coming from Adidas Sambas. Same size?

Go a half size down from your Sambas. Owners repeatedly report e.g. 8.5 in Adidas → 8 in Tigers; the Mexico 66 is narrower and runs longer, so the smaller size fits cleaner.

I have wide feet. Will they fit?

The last is narrow and slightly pointy — the shoe's main limitation. Don't size down; stay true to size for toe room, lace snugly to stop heel slip, and let the leather break in. Genuinely wide or splayed-toe feet may find it tight even then.

How it compares to other models

  • Onitsuka Tiger Serrano Low confidence

    Same Onitsuka retro last — the Serrano fits like the Mexico 66 (same size, same narrow, runs-long character), so carry your Mexico 66 size straight over

  • Adidas Samba OG Medium confidence

    Owners who wear Sambas typically go a half size down in the Mexico 66 (e.g. 8.5 Adidas → 8 Tigers); the Tiger is narrower and runs longer

  • Converse Chuck 70 Low confidence

    Both are flat, low-profile, narrow-leaning silhouettes; wearers often land on a similar size, with the Mexico 66 running a touch longer so a half-down is common

More Onitsuka Tiger sizing help

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