It's not up to the dealer or Harley! My dealer kept saying to many miles I said go read the Dunlop Warranty include with every bike sale, I got 3 tires from Harley on the wife's 07 FLHRSE3. I know I'm the exception. Maybe Harley has change their Warranty but Dunlop has not!!!!
The tires are warrantied by Dunlop as follows.
WHAT IS WARRANTED
Every new Dunlop motorcycle tire that becomes unserviceable within six years or 72 months of the date of manufacture for conditions other than those which are listed under "WHAT IS NOT COVERED" will be replaced on the basis specified under "REPLACEMENT COST" below.
ELIGIBILITY
This warranty is extended to the first retail purchaser.
REPLACEMENT COST UP TO 50% WORN
If, during the first fifty percent (50%) of tread wear, the tire becomes unserviceable for a condition covered by this warranty, it will be replaced with a comparable new Dunlop tire. You pay only for retailer services, such as mounting and balancing.
AFTER 50% TREAD WEAR
If, after the first fifty percent (50%) of tread wear, the tire becomes unserviceable for a condition covered by this warranty, your Dunlop motorcycle tire retailer will replace it with a comparable new Dunlop tire at a cost calculated in the following manner:
Either your original buying price substantiated by invoice, or the retailer's current selling price, times (x)
Fifty percent (50%)
Plus (+) all applicable federal excise taxes, and local taxes and all charges for retailer services such as mounting and balancing
A CASH REFUND WILL NOT BE EXTENDED IN LIEU OF THE ABOVE.

Brad