new tyres?

[The Central Scrutinizer]

Bought a giant defy 4 in may and so far have done about 1300 miles on it.
The tyres(giant s-r4) 25s have a few nicks in them but because they are slick, hard really to tell the condition of them.
My question is when do i think about replacing them and what tyres to replace them with?

 

[HLaB]

Slick? Worn or treadless. If its the latter thats no reason to change a tire the less tread the more of your tire is in contact with the road so they are more Grippy. There's a lot more to it than just mileage but I'd expect to get a lot further out of a tire and I'd run them still I started getting more p'tures than usual. As to what to replace them with there a plethora of tires out there (and you'll get a plethora of answers) it depends what you are wanting, weight/grip/rolling/p'ture protection/wear/cost. Conti GP4000s are the best I've had when it comes to grip/roll and its reported that Marathon + are best for p'ture protection (although heavy). I've found Mitchelin Krylion Carbons (now Pro 4 Endurance) are the best all rounders for me.

 

[The Central Scrutinizer]

HLaB

Sorry about the confusion,slicks as in treadless.
.

 

[Ben M]

Michelin Pro 4 service course or Continental GP4000s 2 for dry wheels
Vredstein fortezza tricomp for wet wheels

All in 25mm.

 

[vickster]

I replaced my Giant tyres with Michelin Pro 4 endurance in 25mm

 

[Broadside]

My question is when do i think about replacing them and what tyres to replace them with?

I replace mine when they puncture more than usual as HLab says, but you also need to watch out for when the centre of the tyre squares off. After about 2000/3000 miles I find the centre of the rear tyre gets noticeably flatter and less rounded and eventually it leads to skittish grip in damp corners.

 

[the_mikey]

As above (I'm just posting to bring some consensus) I swap my tyres when there is noticeable flattening of the centre of the tyre,or after suffering some significant damage or unusually frequent flat tyres.