Mountain bike tyre sizes are usually stated in inches.
													
																	Bike inner tube sizes explained. 
									
		
	
	
		
	
	
		
	
	
		
	
																	How to get the right bike tube and valve size. 
																	27 5 x 1 9 2 3 for example. 
																	In the previous example a tube labeled 26 x 1 9 2 125 has the correct diameter of 26 inches. 
																	Inner tubes typically state a wheel diameter and width range for which they will work e g. 
															
													
									
		
	
	
		
	
	
		
	
	
		
	
																	Depending on whether your bike is a road bike touring bike mountain bike or child s bike the diameter and circumference of the wheel can vary. 
																	So a 29 inch mtb tube will have the same diameter as a 700c road wheel while a 27 5 inch tube will be the same diameter as a 650b road wheel. 
																	A narrower inner tube will balloon. 
																	For example one of our most popular tubes is the 26 x 1 75 2 125 which means it fits a 26 inch diameter tire with a width in the range of 1 75 to 2 125 inches. 
															
													
									
		
	
	
		
	
	
		
	
	
		
	
																	Because inner tubes stretch they typically come in a range of widths. 
																	The diameter needs to be the same e g. 
																	Thus you need to be sure any new bike tube has sizing that has a width range that aligns with the sizing on your bike tires. 
																	Tubes because they can stretch will list a range of widths. 
															
													
									
		
	
	
		
	
	
		
	
	
		
	
																	700 or 26 but the tube s width will vary depending on the amount you inflate them like a kid s balloon. 
																	Bike tube sizing essentially mirrors bike tire sizing with one exception. 
																	The width of your tire 1 95 inches falls within the range of the widths displayed on the tube. 
																	Then within these categories there are further sub divisions such as 26 inch 27 5 inch and the 29ers commonly. 
															
													
									
		
	
	
		
	
	
		
	
	
		
	
																	Common inner tube ranges for 26 inch 27 5 inch and 29 inch tire diameters 1 0 to 1 15 inches 1 25 to 2 0 inches 2 0 to 2 35 inches 2 4 to 3 0 inches. 
																	Inner tubes vary in size depending on the circumference of the wheel and the width of the tyre.