I have a 2005 (maybe 2004) trek 4300 disk that needs a rear brake adapter however I have no idea what kind. I figured the wealth of knowledge on here may help. I can upload a pic later if that helps. Here is the link to the frame. Thanks for any advice.
2005 4300 (Disc) - Bike Archive - Trek Bicycle
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Thread: Older 4300- Disk Adapter