If you buy something on CL get a bike with cromo forks, not aluminum. At 350w you could use torque arms just to be extra safe. You don't need them on 250w steel forks. If you put on your roadie, def. use torque arms for the extra protection, but people use after market kits all the time and there's no problem with a proper install. If you have a really nice road bike, I'd get the second CL bike to motorize. You may have to file your dropout openings a bit to fit the 10mm axle; frequently road bikes have 9.5mm openings and you may feel more comfortable doing that to a less valuable bike.