My husband's Continental Grand Prix 4000 tires are awesome. They are about $50 each.
The amount of difference tires will make is dependent upon the quality of the wheels. When you are planning upgrades to a bicycle, you have to think about where you can get the most bang for the buck. The OCR3 has no-name wheels, so you might want to get better wheels altogether. Of course, then there is the question of whether that's worth it. Tough decision.
A bike dealer once said to me that the only bikes worth upgrading are when you feel you have the absolute best frame for your purposes. If you are REALLY happy with the frame, then by all means upgrade components. If you are not thrilled with the frame and imagine yourself upgrading to a better one eventually, then just leave your bike the way it is until you can upgrade the whole thing. It's more expensive to make upgrades piecemeal and not worth it unless you are keeping the bike forever. When you get a whole new bike, you are actually getting a great deal on components.



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