What are the main differences and benefits of the RaceFace evolve FR bb and the signature FR bb? Do the airlines have to be used with a single chainring up front? Could I use a chainguide system with the FR bb or do I have to use the DH bb? I've found the airlines for $400, but is there any place that has them for less? Also what crank length would be a good compromise for FR/DH/XC?
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