The Koppenberg Fat Boys are available in two optimised widths:
DMX for 23mm tyres & DM8 for 25mm
The Past: Dark Energy DMX series
Dark Energy DMX series rims are engineered to optimise true-width 23mm tyres, with a 25mm external / 18.2mm internal width. Compatible with tubeless and standard tyres from 23 - 28mm. Robust, tough and highly durable for year round performance in all weathers.
SHOP DMX FAT BOYS
The Future: Dark Energy DM8 series
Dark Energy DM8 series rims are engineered to optimise true-width 25 - 28mm tyres, and that means tyres sold today with 23 and 25 printed on their sidewalls. With upto 30mm external / 19.85mm internal width, designed to fit most modern road race bikes as well as gravel, CX & track, compatible with tubeless and standard tyres from 25 - 30mm. Robust, tough and highly durable for year round performance in all weathers.
SHOP DM8 FAT BOYS