Add It Tyre Seal instantly repairs & inflates your tyre quickly and easily without the need for tools and jacks Simply connect to the tyre valve and the special formula will quickly seal and inflate your tyre in 90 seconds For use on medium to large cars 4x4s and vans Suitable for large tyres 17 inches and above To find out what your wheel diameter is check your tyre side wall - this is the number displayed next to the R on your tyre for example "R17"