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What size tube do I need? Please Help

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I just ordered new tires (front & rear) Maxxis IT 100/90-19 & 80/100-21 I was going to get the Heavy Duty tubes for both of these tires but as I was ordering I read that if you get the HD tubes they suggest you get a size smaller tube. Just confused on what tubes I actually need to buy and what size? Should I just buy the ones that are made the same size as the tire? This is my first time changing/buying tires & tubes. All/any help will be GREATLY appreciated. Thanks Guys!!!!

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Is there a bump rule here? Also, really no one can help with this question? not even 1 view :(

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That sort of answered my question. they do have my size tubes, but it says they reccommend getting a size smaller if you get the heavy duty tubes. Am I going to have trouble fitting the ones the same size as my tire in?

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