With the seemingly sudden advent of 27. 5 tires, heading out without your own spare tube is a lot more of a gamble than it would be with your traditional 29er since most well meaning fellow trail riders will probably not have a corresponding tube to help you out. Stock up on WTB's 27. 5in Plus Presta Mountain Tubes while you wait for the rest of the world to catch up to the 27. 5 trend so you never end up cutting a ride short because of a flat.
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