DCA and Portfolio Rebalancing, is it a contradiction?

Hi all,

Curious to hear your thoughts on this.

Traditional finance advice is to just Dollar Cost Average (DCA) into stocks and not try to time the markets at all. How does this work if one is planning to DCA into multiple asset classes though, as isn't periodic rebalancing of a portfolio implicitly 'timing the market'? 

Should one just set an allocation for new investments and then ignore ifthe weightings get totally out of whack?

Thanks,