Kinda depends on what you're doing for the rear wheel. If you're adapting a multicog cassette, then you can get the 120 and adjust the chainline by moving the spacers around. If you're using a non-adjustable single speed rear hub, you're going to have to get more scientific.
Kinda depends on what you're doing for the rear wheel. If you're adapting a multicog cassette, then you can get the 120 and adjust the chainline by moving the spacers around. If you're using a non-adjustable single speed rear hub, you're going to have to get more scientific.