I have a Trek FX2. I ordered the default kit but it was too big for my bikes forks. After contact with the support team, I paired the kit down to fit the forks. The support team offered to send a new kit out free of charge, while also confirming that me filing the kit would be covered on warranty, very helpful. I would suggest Trek FX2 users to order a kit with a 9mm width, the 10mm width is too big. Assembly, I found the assembly pretty straightforward. There’s a sensor which picks up when you start pedaling, it’s a great feeling having the motor kick in for the first time. Unfortunately bikes are often targeted for theft, I believe the fact the battery comes with you, after parking the bike, makes the swytch bikes less likely to be stolen. On the whole, I’m delighted with the swytch kit and would highly recommend.