I have worked to change all my nuts, bolts to either 4,5,6mm allen head or a 10mm along with a 15mm wheel nuts. I have a dedicated set of 4,5,6mm allen wrenches and 1 10mm and 1 15mm box and open wrenches just for in my tool bag. and a small phillips/flat double ended screwdriver with 3 tire irons.
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72 Geoffery Butler, 72 Gugificatizion Witcomb, 72 Raleigh Gran Sport SS, 74 Raleigh GrandPrix dingle speed, 74 Raleigh international, 81 Centurion Pro-Tour, 85 Gazelle Primeur, 29rBMX, Surley Steamroller 650b