Both the rear gear cassette (stack of drive sprockets)are ShimanoTM TourneyTM. This combination is not a high priced racing-style model, but is the very best choice for the intended bike trail and touring anticipated for the BOOMERtrikeTM.
The chain, interestingly, is a high-quality product manufactured by SramTM rather than ShimanoTM. Dependint upon the gearing options you select, the chain will be matched to the cassette in the best combination we know how to devise.
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