Narrow Wide

Tooth Profile - Narrow Wide

Also know as variable tooth profile, these teeth vary in thickness as each tooth is designed to fit into a different size chain link. The inside width of chains vary in a narrow, wide, narrow, wide pattern hence the "Narrow Wide" name given to these teeth.
The narrow teeth will only fit into the narrow chain link while the wide teeth will only fit into the wide chain links. This odd, even pattern results in chainrings only having an even number of teeth on them.
For example:
- 32T is an even number which maintains the narrow, wide, narrow, wide pattern.
- 31T being an odd number would result in a narrow, wide, wide, narrow, wide pattern which doesn't mesh with a chain.

BYKAID: 
SP.350.1.2

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