Since you're talking "stock" wheels, can't go wrong with GP 4000s for all 'round performance/training tires - stick with them.

Agree. I've had no issues with them and I always have two sets. I make sure to get them on sale. I use one for training and one for racing. I have some old Vittoria tires that came with my bike and those things just wear out fast

GP4KS2 tires are both and. They are nearly perfect. Buy a set, and ride them everywhere.

+1. Give up a couple watts to the fastest tires and get some flat protection and a tire that will last all season long.

I've yet to find a reason after almost 4 years now, not to use these for race tires, rotate front to rear, then rear to training wheel. Then ride it until it gets damaged or worn out. I usually get a sidewall cut or severe puncture before they wear out. Noise levels are ow and wear are excellent on the trainer too.

I even leave the latex tubes in them and just keep adding more sealant. But the time they are onto a training rim, the volume of sealant slows pressure losses considerably.

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