? on tire size. Iwas given 2 new 3.5x10in street tires. I have douglas rims. The ? I have is are they 2 big and can I use 2.75 tubes or do they have to be bigger? I got them for free but I keep hearing not to use them and go w/ a 3.0. I have a extended 3in sik 50's swingarm by the way. Thanks