There Is Now a ‘Smart’ Bike Tube That Talks PSI With Your PhonePersonally, I don’t use inner tubes anymore. So, I’m not really the target market for this new, very fancy inner tube from Tubolito. Called the PSENS system, it’s an inner tube with a microchip in it that measures PSI and sends that info to an app on your phone. Regular, non-smart Tubolitos are already in the $35 range, because they’re super light, pack down very small, and are, reportedly, much tougher than standard rubber inner tubes. The PSENS system is available for 27.5 and 29-inch wheels, with tires up to 2.5″.