Topic: Which Tube To Get?

[campbmic]

I'm getting a new rear tire and tube for my 75 Cb550. After some research I found a 110/90/18 rear Bridgestone Spitfire for $60 through bike bandit. However, I can't seem to find the right tube for it, the two I did find were

110/100/18
120/90/18

So would either of these work? Which one should I get? Do I need to go to a different source and buy an exact 110/90/18?

Thanks guys!

[dave500]

id find the correct tube,itll get a fold in it inside and wear through,plenty have used incorrect tubes and been ok,i wont.

[754]

 Oversize tubes thend to get a fold in them, so order the right ine ahead of time if you can..
 Had a new tire/tube this summer tube was a bit big, had a fold in it.
 On a vintage ride with a dozen other bikes 125 miles from home it got a medium speed leak. got a tube and fixed it, but it made me miss a shop yoir. Good thing it happened in town , because it was 60 miles + a ferry to the next town where I probably could not get a tube.
 It developed a small tear at the base of the fold.
 I am finding shops tend to only stock the larger tubes..