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Onitsuka Tiger to Altra men's shoe size

The short answer

Onitsuka Tiger 13.5 is Altra 13 or 14 by the two brands' own charts. 1 of 21 Onitsuka Tiger sizes land on a different label at Altra.

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. US men's sizes on the left, US men's on the right.
Onitsuka TigerAltra, by chartSame labelAltra also prints
44not publishedUK 3 · EU 37 · CM / JP 22
4.54.5not publishedUK 3.5 · EU 37.5 · CM / JP 22.5
55not publishedUK 4 · EU 38 · CM / JP 23
5.55.5not publishedUK 4.5 · EU 38.5 · CM / JP 23.5
66not publishedUK 5 · EU 39 · CM / JP 24
6.56.5not publishedUK 5.5 · EU 39.5 · CM / JP 24.5
77not publishedUK 6 · EU 40 · CM / JP 25
7.57.5not publishedUK 6.5 · EU 40.5 · CM / JP 25.5
88not publishedUK 7 · EU 41 · CM / JP 26
8.58.5not publishedUK 7.5 · EU 42 · CM / JP 26.5
99not publishedUK 8 · EU 42.5 · CM / JP 27
9.59.5not publishedUK 8.5 · EU 43 · CM / JP 27.5
1010not publishedUK 9 · EU 44 · CM / JP 28
10.510.5not publishedUK 9.5 · EU 44.5 · CM / JP 28.5
1111not publishedUK 10 · EU 45 · CM / JP 29
11.511.5not publishedUK 10.5 · EU 46 · CM / JP 29.5
1212not publishedUK 11 · EU 46.5 · CM / JP 30
12.512.5not publishedUK 11.5 · EU 47 · CM / JP 30.5
1313not publishedUK 12 · EU 48 · CM / JP 31
13.513 or 14not publishedUK 12 · EU 48 · CM / JP 31
1414not publishedUK 13 · EU 49 · CM / JP 32
Neither chart publishes the body each size is built for, so the rows line up the labels. Tinted rows change label or sit between two sizes. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

Altra to Onitsuka Tiger