Having replaced a nearly new set of tyres due to a puncture you can imagine how I feel having picked up another rear puncture in the new tyres only 1,000 mile later. I didn't really want to use a sealant (thats why I bought new last time), but can't afford £90 for another rear so soon so I have gone for the ultraseal option. I've used it before on the Bandit 1200 but the Blackbirds performance is in another league. I'm trying to judge the mileage so they are replaced just before the TT.....so thats about 250 miles per week I need to do. Mark