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The parts most likely to need an adapter
81%
Miyota 8215 needs an adapter or does not fit in 81% of the combinations we checked, the highest share in the dataset.
Which part most often needs an adapter?
Miyota 8215 tops the list: 22 of its 27 checked combinations (81%) need an adapter or do not fit. The full ranking is below.
| # | Parts | Adapter | No fit | Adapter-or-no rate |
|---|---|---|---|---|
| 1 | Miyota 8215 | 16 | 6 | 81% |
| 2 | Miyota 8205 | 16 | 6 | 81% |
| 3 | Miyota 9015 | 16 | 6 | 81% |
| 4 | Miyota 9039 | 16 | 6 | 81% |
| 5 | Miyota 821A | 14 | 6 | 80% |
| 6 | Miyota 90S5 | 14 | 6 | 80% |
| 7 | ETA 2824-2 | 17 | 3 | 87% |
| 8 | ETA 2836-2 | 17 | 2 | 86% |
| 9 | Sellita SW260-1 | 19 | 0 | 100% |
| 10 | Sellita SW290-1 | 19 | 0 | 100% |
| 11 | Sellita SW200-1 | 17 | 1 | 86% |
| 12 | ETA 2892-A2 | 17 | 1 | 86% |
| 13 | Sellita SW220-1 | 17 | 0 | 85% |
| 14 | Sellita SW300-1 | 17 | 0 | 85% |
| 15 | ETA 2801-2 | 17 | 0 | 85% |
| 16 | Sellita SW210-1 | 17 | 0 | 85% |
| 17 | ETA 2804-2 | 17 | 0 | 85% |
| 18 | Sellita SW215-1 | 17 | 0 | 85% |
| 19 | Sellita SW216-1 | 17 | 0 | 100% |
| 20 | Seiko 6R35 | 6 | 7 | 100% |
| 21 | Seiko NH35 (TMI NH35A) | 4 | 8 | 80% |
| 22 | Seiko 7S26 | 6 | 6 | 100% |
| 23 | Seiko NH36 (TMI NH36A) | 4 | 7 | 79% |
| 24 | Seiko 4R35 | 4 | 6 | 77% |
| 25 | Seiko 4R36 | 4 | 6 | 77% |
| 26 | Ronda 515 | 3 | 0 | 43% |
| 27 | Sellita SW510 | 3 | 0 | 100% |
| 28 | Ronda 6004.B | 2 | 0 | 40% |
| 29 | ETA 2834-2 | 1 | 1 | 100% |
| 30 | ETA 2671 | 1 | 1 | 100% |
| 31 | ETA 2681 | 1 | 1 | 100% |
| 32 | Ronda 6203.B | 1 | 1 | 100% |
| 33 | Ronda 5030.D | 0 | 2 | 100% |
| 34 | Ronda 5021.D | 0 | 2 | 100% |
| 35 | Ronda 715 | 1 | 1 | 100% |
| 36 | Ronda 513S | 1 | 0 | 20% |
| 37 | ETA Valjoux 7750 | 1 | 0 | 25% |
| 38 | Sellita SW500 | 1 | 0 | 25% |
| 39 | Ronda 4220.B | 0 | 1 | 100% |
| 40 | Ronda 763 | 0 | 1 | 100% |
How this is worked out
For every part we counted the combinations that resolve to an adapter fit or a no-fit across the reference set, and ranked by that count. The rate is those combinations divided by all combinations checked for that item.
Data as of 2026-09-05.
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