Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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There's no easy answer. The rigidity of a booster diminishes as the arch gets taller. So there's a degree of proportionality between the arch height and thickness.
I've seen some made from 1/8" thick aluminum plate, and others forged (or maybe cast) in aluminum about 1/2" wide by almost 1/4". thick. The beefier ones are more typical on suspension forks where they may also serve to support the fulcrum where the housing ends.
In any case anything is better than nothing, and the booster requirements depend somewhat on the rigidity without the booster. I'd start with 1/8" aluminum plate, and use as much width as the clearance requirements allow.
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