I know this is a Cannondale forum, but I since I'm putting it on a Prophet, it related somehow.
In my FSA Mega-Exo kit, I have the normal black washers and a larger green cup/washer thingy.
What is this thing used for and do I need it for any reason?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: FSA Mega-Exo Green Washer/Cup?