Tires too. I just put together my Peugeot PH10 yesterday afternoon, with a set of Cheng Shin 27x1 3/8" knobby tires, since I had nothing else at the moment. It felt like I was riding a Continental with low tires. It zapped my leg strength in short order. I imagine it would be a good training bike. The same bike feels like a high end racing version with a decent set of tires on it.,,,,BD