Size Guide
What do the numbers (51-16-140) on the arm of the frame stand for?
What is the definition of Narrow, Medium and Wide?
| Total Width | Range |
| Narrow | <135mm |
| Medium | 135mm-140mm |
| Wide | >140mm |
| Total Width | Range |
| Narrow | <135mm |
| Medium | 135mm-140mm |
| Wide | >140mm |
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