I'm putting a Dunlop E3 on my rear wheel next week and was wondering if I will run into any problems keeping the stock front tire on (D402) as it is still in very good shape.

 

Don't know why you would have a problem.

 

Yeah, me neither as I've done this a few times on other bikes without issue.&nbsp\\; I was reading some posts earlier about mixing front and rear tires and some were suggesting against it.&nbsp\\; Perhaps the mixing they referred to was bias/radial?
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as long as you stay with the same stlye tread and manufacture it shouldnt be a problem. wouldnt reccommend mixing brands

 

I ran a MEtz on the back and Dunlop on the front for a long time while I waited for the front tread to wear down. Never had a problem.