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Plus, you are only pumping it up to what, 15 lbs at the most? It'll work. We all switched to smaller tubes on our fat bikes when we realized we were dropping couple lbs in tube weight alone up here in the north country! And we run them around 5-10 lbs at the most in snow and off road conditions. You'll be good
Any 26 x 2.125 tube will do. The big fat ones are just heavier, that's all .Well I thought I had a 26x4.9 tube and I don't the one that's in there now has tube fold from stretching in the back and I wanted to change it out . I had to order one asap I don't know if it will be in on time [emoji17]
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Plus, you are only pumping it up to what, 15 lbs at the most? It'll work. We all switched to smaller tubes on our fat bikes when we realized we were dropping couple lbs in tube weight alone up here in the north country! And we run them around 5-10 lbs at the most in snow and off road conditions. You'll be good