Fat BB are around 15mm diameter (the same as the cook bros BB) and Klein, action tec and suntour grease card for Merlin are 17mm.
What are thespindle diameter of BB fisher ?
I would change my RS1's for a longer
I might have an extra axle for the pressed-in Fisher 88 mm BB. They are not like the the normal axles, because of the bearings and the width of the BB. I found these a while back on eBay and bought some more! See pics below. PM me if interested!