Review on Enhance Your Cycling Performance with Campagnolo PI6-RE BB Bolt-On Resin Cable Guides by Rubeen Black

I used to restore my Trek 720. The old one was getting brittle and I was afraid it might break. It's very similar in design and size to the device that came with the Trek 720 and seems to work well. Since it has a slot for the fasteners and not a single hole, you'll need to figure out where to place it on the axle hub so it's properly positioned for the shifter cables by noting where the old unit had the cables.