NCAA - DUAL CHAMPIONS!
Join Date: Mar 2000
Location: From Sarasota, FL sitting in front of a computer spewing random thoughts!
Bikes: Intense Uzzi SL, Masi Speciale, Trek 3700 Nashbar Single Speed, Old Cilo Road frame
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As Khuon mentioned, if your derailleur stops are properly set then you don't need the dork disc.
If you want it anyways, you must remove your cassette. You need the proper tool to do this. Your LBS could do it for you in about 5 mins.
If you don't want it and need advice/assistance is setting your stops, PM me and I'll walk you through it, or check out www.parktool.com
and they have a repair step by step. http://www.parktool.com/repair_help/FAQrindx.shtml
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger