Vintagecarguy Posted April 26, 2015 Share Posted April 26, 2015 Does anyone know if inner tubes for 31x4 tires are available? My grandfather and I are looking at a car and I can find 31x4 tires but not tubes. However, I did read on another thread that you can use a 30x3-1/2 tube in a 31x4 tire. Is this safe? Any help would be appreciated. Thanks in advance. Vintagecarguy. Link to comment Share on other sites More sharing options...
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