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Discussion Starter · #1 · (Edited)
New gravel bike has 650b wheels. Lightest tube in town is 193 grams, a Vittoria "ultra lite" tube. Any leads on an inexpensive (not Tubolito) 27.5/650b tube for a 1.9/2.1 tire?

edit/addendum: this is a spare weight weenie tube to carry on long brutal gravel events. I run tubeless.
 

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Discussion Starter · #4 ·
Why use a tube? Go tubeless. Haven't had a flat since I did 3 years ago and I live in the desert.
This ain't my first rodeo: I've been tubeless for about 15 years. Last year during a 2-day gravel event (107 miles each day) I had 4 flats. The bacon strips eventually failed, and both my spare tubes got flats, and glueless patches don't stick to spare tubes covered in sealant residue. A few times I've had to insert two spare tubes on my 29er during 12 hour races. I guess if I rode within an hour of the car/home a spare would not be an issue.
 

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Speaking of 26", I just put these in my new 26" Race King RaceSports this past weekend. The tubes were 97g each on my scale (tires were 477/478g). Super fast!

If you want the correct size, the Continental MTB 27.5 Lite tubes are 145g.
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This ain't my first rodeo: I've been tubeless for about 15 years. Last year during a 2-day gravel event (107 miles each day) I had 4 flats. The bacon strips eventually failed, and both my spare tubes got flats, and glueless patches don't stick to spare tubes covered in sealant residue. A few times I've had to insert two spare tubes on my 29er during 12 hour races. I guess if I rode within an hour of the car/home a spare would not be an issue.
You know the drill. He needs tubeless
 
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