Join Date: Jul 2005
Bikes: 1984 Trek 520; 1990s Peugeot (Canadian-made) rigid mountain bike; 2007 Bike Friday NWT; misc others
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My bike has a mixture of M4 and M5 bolts, with a hex recess in the head.
To install a dork disk you need to get your bike store to remove the freewheel, or learn to do it yourself. You will probably need a special tool called a freewheel puller and a very long crescent wrench or a bench vise.
I like dork disks - they suit my "Fred" personna, so I don't remove them from bikes that have them, but I'm not sure I would go to the trouble of adding one.
Last edited by cooker; 05-26-08 at 08:05 PM.