Depends on the compound. The cooler the temp the softer compound you want. You use hard compounds for hot temps. In the heat the soft compounds will break down to fast, so the hard compounds are better. In cooler temps the softer/stickier tires will help you a lot more. Depends on what you are using them for as well. Both the slicks and 211's run in different compound variations.

 

Is this on the track? If not i wouldnt use either of these tires.

 

I've been using the D211GP (DOTs) most of the year, for WERA racing and some track days. I recommend that you get to know the nearest Dunlop tire distributor. He will be the most knowledgeable.

 

:stupid

Hit up Paul with Dunlop (he is WERA's trackside vendor in the SE) and a damn good dude.

As far as DOT's vs Slicks, you can use either in any type of temperature. The only difference is that the Slicks will suck in the rain.

The psi is the same for Dunlop Slicks and DOT's.

As far as the compound, colder = softer isn't always necessarily true. Some softer tires are bad about cold tearing. I have heard of some people going from a medium to a medium-hard when the temperature drops to keep from having so much cold tear.

Again, that information will vary by brand so the best thing you can do is talk to Dunlop.