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Group
A group is a set of parts for one bicycle from (usually) a single manufacturer. The practice of selling parts as a group (or "gruppo" in Italian) probably originated with Campagnolo in the 1960's.
A group would normally include (as a minimum) the following:
- Hubs
- Bottom bracket
- Derailers
- Shifters
- Brakes
If a particular manufacturer doesn't make one or more of these items, it may have some made under its name by another manufacturer to fill in a group. For instance, when Mavic was offering groups, it had everything listed above except for brakes, so it had brakes made under its name by Modolo and Dia Compe, and pedals by Look.
If the manufacture offers them, a group could also include:
- Pedals
- Headset
- Seat post
Note the distinction between a "group" and a "kit": In addition to the group, a kit includes everything needed to turn a frame into a bicycle: built-up wheels (rims, spokes, tires, rim tape, tubes), handlebars, saddle, etc.
