Bridgestone Heavy Duty Tube Size - 80/100-21 Valve Stem Type TR-4 $38.94
Bridgestone Ultra Heavy Duty Tube Size 80/100-21 $34.40
Michelin Airstop tubes are used by those who want the very best $28.45
Maxxis Heavy-Duty Tube 90/100-21 - TR4 $18.95
MSR Heavy-Duty Tube - 80/100-21 - TR-6 Valve Stem PRICE: $20.85
MSR Ultra Heavy-Duty Tube - 80/100-21 - TR-6 Valve Stem 1.75mm thick $43.65
Kenda Heavy Duty Tube - 80/100-21 - TR-6 2.5mm heavy-duty butyl rubber $27.50
Kenda looks like the best buy with it's 2.5mm rubber but what makes the MSR worth $43.65, or the Bridgestone at $38.94?
What do I need to understand to make the best purchase of a new tube?
and where do I find that information?
what is the difference between Valve Stem Type TR-4 and TR-6?
Edited by Ryel, 27 June 2012 - 02:26 PM.