Encoders, why yes, we have hundreds (248 part numbers, to be exact) of sizes, styles, and communication options.
Thanks for noticing, pilleya! (we already awarded you one extra voucher above - you almost had me going for a second ;-)
Only 4 left!
Chip
Encoders Selection Guide
Encoders Frequently Asked Questions (FAQ)
Most teams like the "open collector" (OC) outputs on the encoders, because the roboRio ties it's inputs high...