Have EZIP electric bike and almost gave up because of flats-rear is timely work -Then I tried Marathon mondial evolution DD and will never use anything else-does not seem heavy to me and on my 3rd pair with 1 flat total. Ride approx 3500 miles per year as this is my only transportation-live in warm Florida-USA. As all the weight is rear on my bike I decided to try Schwalbe Kojak on the front and have same opinion (never anything else) at first I thought this was too expensive for a bike tire compared to what I was used to paying--WAS I EVER WRONG worth every penny!