Bock and strong lager
Eisbock
A doppelbock concentrated by freezing and removing the ice. Everything gets bigger at once: malt, body, alcohol and any flaw that was already there.
Vital statistics
Each bar is drawn against the full range of all 98 styles
Original gravity
1.078 - 1.120
1.078 - 1.120
Final gravity
1.020 - 1.035
1.020 - 1.035
Bitterness
25 IBU - 35 IBU
25 IBU - 35 IBU
Colour
18 SRM - 30 SRM
18 SRM - 30 SRM
Alcohol
9% - 14%
9% - 14%
Colour also 35-59 EBC
What goes wrong
Freezing out too much. Past about a quarter of the volume the alcohol turns harsh and the beer stops being drinkable; also check what your jurisdiction says about freeze concentration.
Commercial examples
Reference examples of the style, as listed in the BJCP 2021 Style Guidelines. Availability varies by market and year.
Vital statistics as published in the BJCP 2021 Style Guidelines. Not yet checked against the published guidelines: treat these ranges as a planning aid and read the source at bjcp.org before entering a competition.
The rest of the bock and strong lager family
Plan a batch to these numbers.