I see no reason to change frames, unless you intend to compete seriously. An aluminum frame will generally be stiffer than a steel frame, mostly due to the larger size tubing, and it might also be lighter and/or more aerodynamic. However, the Bareknuckle has true track geometry, so it will have the same good track handling as an aluminum or carbon track frame. I might add that for the first thirty years of track racing, I rode a steel track bike (Schwinn Paramount P14) and never found it lacking.
As to training, well what is the purpose of your training ? Are you planning to compete, or are you doing this for health and fitness ? When I used to train at the track, I was preparing for specific types of racing events. If you could be more specific, maybe I or other experienced track riders/racers could provide some recommendations.
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