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Onitsuka Tiger to Altra shoe size

The short answer

Onitsuka Tiger 28.5 is Altra 12 or 13 by the two brands' own charts.

At least one of the two brands publishes no foot length, so the rows line up the US size both charts print. Treat it as the label conversion, not a fit.

Every Onitsuka Tiger size read across to Altra. CM / JP sizes on the left, US women's on the right.
Onitsuka TigerOnitsuka Tiger builds it forAltra, by chartSame labelAltra builds it forAltra also prints
22not published4.5not publishedfoot length 21 cmUK 2.5 · EU 35
22.5not published5.5not publishedfoot length 22 cmUK 3.5 · EU 36
23not published6not publishedfoot length 22.5 cmUK 4 · EU 37
23.5not published6.5not publishedfoot length 23 cmUK 4.5 · EU 37.5
24not published7not publishedfoot length 23.5 cmUK 5 · EU 38
24.5not published7.5not publishedfoot length 24 cmUK 5.5 · EU 38.5
25not published8not publishedfoot length 24.5 cmUK 6 · EU 39
25.5not published9not publishedfoot length 25.5 cmUK 7 · EU 40.5
26not published9.5not publishedfoot length 26 cmUK 7.5 · EU 41
26.5not published10not publishedfoot length 26.5 cmUK 8 · EU 42
27not published10.5not publishedfoot length 27 cmUK 8.5 · EU 42.5
27.5not published11not publishedfoot length 27.5 cmUK 9 · EU 43
28not published11.5not publishedfoot length 28 cmUK 9.5 · EU 44
28.5not published12 or 13not publishedfoot length 28.5 cmUK 10 · EU 44.5
29not published13not publishedfoot length 29.5 cmUK 11 · EU 46
29.5not published13not publishedfoot length 29.5 cmUK 11 · EU 46
30not publishednot madenot publishednot publishednot published
30.5not publishednot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Altra chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

Altra to Onitsuka Tiger