That's a lot for a good inner tube. Individual tubes, especially those with long 80mm Presta valves, are usually hard to find and retail for around $9-$10 if you can find them. I use deep carbon clinchers and prefer not to use tube extensions unless they are practical as they fit my 68mm deep wheelset. It's also convenient to carry as a spare as it fits any wheel size and won't let you down. Continental is a trusted brand and the quality of the tubes is good and stable.
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