They take up too much room to be useful as a spare tube.
Rating: 
Reviewed By: Richard Reis on 7/6/19
Too big
Q Brand Thorn Resistant Tubes
Beefier tubes for thorny rides. 4mm wall thickness in the tread area and 2mm in the rim area. Presta valves with a removable valve core.
Please note, you might receive mixed packaging for a period of time as the Q-Tubes brand is phased out and replaced by Teravail tubes. Teravail tubes will serve the same functional range as their predecessors.
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- Q Brand Tubes
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- Schwalbe Marathon HS 420
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Reviews
Average rating: 
based on 4 reviews.
No flats
Rating: 
Reviewed By: Peg byram on 4/21/19
Happy after getting no flats in goathead and chip seal country..west tx big bend tour
Qtubes thorn resitant
Rating:
Reviewed By: Guy Laronche on 3/23/16
I was planning to carry them as spares for my Southern Arizona Adventure Tour but I could not. They come in boxes that are 10 x 3.75 x 2.3 inches vs a normal tube box of 4.25 x 3 x 1.5 inches. I also did not have the time to mount them on my bike and do a thorough test before leaving. They seem sturdy (think garden hose)..On the other hand I did not have a flat during the tour with my standard tube and my Continental Gatorskin tires. So the jury is still out on my side.
Product Reviews Elsewhere Not Encouraging
Rating:
Reviewed By: Don on 1/8/16
I'm headed out on the ST route soon and needed thorn protection as I've read of the flats ahead. This tube brand appeared to be a good idea, however, I suggest people google reviews around the internet for this brand. I only read a few and they were not encouraging. Although they are thicker to resist punctures, their quality of manufacture apparently is the weak aspect to them and they fail.