There tires are fairly new. They have been difficult to find. The size is a bit larger than we are currently using. This tire is sized as a 90/100-21. The difference is about 10 mm in width. Previously I have been using a Brigestone 401a in this larger size. The Brigestone is great in sand or soft dirt. Our local track is dirt that is more related to cement. The Brigestone squirms around a lot on hard pack. The new dunlop feels great in these conditions. It is easily as good as my 756rr and lasts a lot longr. Give it a try if your looking for a new front tire.