Although the gold Mr. Tuffy Liners specify a tire wide of 32 to 41 centimeters, I was able to insert them into my 28 cm Continental Ultra Gator Skin tires without any problem. I got rid of the slime tube which had been compromised by a shard of glass which had penetrated the tire and left a hole too big for the slime to fill. Now I’ll depend on the Mr. Tuffy liner and the tire instead of Slime to thwart any flats.