I need some advice; I have an OCR3, entry level bike. I was looking to upgrade to a Specialized Tarmac comp. Tried it on the weekend and loved it. My OCR is just 1 1/2 years old. But the Tarmac seemed a lot lighter and the tires were FAST.

My problem. Should I just upgrade the tires on the OCR? They are bigger than the ones on the Tarmac. It seemed like that was the difference between bikes.