In the earlier post on the Specialized Aethos, I introduced the Dura-Ace C36 wheelset, which is lighter in weight than the Dura-Ace C50 wheelset. This time, I still chose a normal clincher type of tire, which means that an inner tube is required. The Continental GP5000 tire is available in both tubeless and tubed type depending on the rider's preference.
The C36 wheelset is tubeless ready, with rim tape already installed. This setup can be used for both tubed and tubeless tires. Since I am using a tubed setup, I would need to select inner tubes for this wheelset.
Previously I have been using normal butyl inner tubes, such as those from Schwalbe. They work well, however there are now alternatives that has some advantages over normal butyl tires.
Butyl inner tubes are cheap and relatively durable, but have more rolling resistance and weigh more. The air retention is good compared to other types. It is the safe but boring option.
Latex inner tubes are a bit more expensive, and are rather fragile. The rolling resistance is very low, about the same as using a tubeless setup. The weight is about 30% less than butyl, while the folded size is about the same as butyl. Biggest disadvantage of latex inner tubes is the poor air retention, as the air pressure can drop drastically over a day. It is usually necessary to pump the tires just before going for a ride.
TPU inner tubes are relatively new, but they have the potential to become an excellent option. They are the most expensive type for now, although they are also more durable than latex tubes. Rolling resistance is also low, although not as low as latex tubes. Weight can be 1/3 that of butyl, while the folded size is reduced by half. Air retention is acceptable as it can last a few days before needing a top up.
From left to right, TPU vs Latex vs Butyl inner tubes.
TPU tube is about half the size of the other two types, which makes it ideal for packing as a spare.