Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't fit

I have a Trek Navigator, a hybrid bike. The rack simply didn't fit. My bike has the pre-threaded holes, but the rack frame was too narrow for my bike frame. I ended up having to modify the installation by cutting and drilling the bracket pieces. But once I got it installed, it works great. If I had not had the tools and an engineering background, I could not have installed this rack.