Continental 29" Bicycle Tube, 1.75"/2.5" 42mm Presta Valve, Black

Fairly lightweight has good thickness and I’ve been running it nonstop for at least six months.

I use the size 26 x 1.75-2.5 MTB 'Conti Tube' tube with my Continental Trail King 26 x 2.4 MTB tires.I use the size 29 x 1.75-2.5 MTB 'Conti Tube' tube with my Maxxis Ardent 29 x 2.4 MTB tires.I like them better than tubes of these sizes sold under brandnames Bontrager, EVO, and Duro because these particular Continentals have removable valve cores, which enables the use of self-sealants such as Slime.Various articles written by expert bike mechanics recommend testing any and all new tubes before stowing them in your backpack in preparation for a ride. If you are in distress out in the middle of nowhere and should need a spare tube, you don't want to discover at that time that your new spare is a DOA. So when I test inflate these tubes to about 10 psi (without installing them), it's a little disconcerting to see them inflate quite non-uniformly, looking quite distorted in shape. However, this peculiarity is not uncommon with most other brands/sizes of inner tubes.I've been using these since spring 2014 and am quite satisfied with them. The only flats I've gotten so far have been double pinch flats due to my own negligence (inflation pressure set too low for high speeds on embedded rocky trail surfaces). These pinch flats occurred whenever I was barrellng down trails having small faceted rocks firmly embedded into the trail, and I had failed to increase the pressure in my tires, leaving them with as little as 16 psi at the front from a just-previous outing on smooth surfaces such as clay or sand. Note that my tires contain thick heavy plastic tire liners and I also fill my tubes with Slime, so those are probably the main reasons why I don't experience ordinary punctures from thorns, etc.For reference, I weighed the tubes on a precision digital scale:Size 26 x 1.75-2.5 weighs 7.61 oz (216 g)Size 29 x 1.75-2.5 weighs 8.25 oz (233 g)Size

I don't have any problems

Holds air, so it does what it's supposed to.

Tubes are great for the price.

The tube quality is good

I purchased one because I keep spares on hand. The one I am using has not failed me and I expect another year minimum

Did not like the quality of the tubes what so ever, I bought two separate tubes hoping to swap out my tubes on my current bike as they’re over a year old so I though some maintenance could help. WRONG! The Bontrager tubes that I have had in my bike for the last year STILL HOLD AIR PERFECTLY, but like I said I figured it was time for maintenance. When I switched tube I only did the back as that’s all I had time to do, aired up the tire and then go to take it outside, by the time I’ve eaten a snack before the bike ride the TIRES COMPLETELY FLAT. What? Okay maybe I pinched it in the tire that’s my bad, let’s air it up and go for a ride and then I’ll switch it out in a different day. Different day comes along, switch out the tube and the entire thing happens again. I will not be buying Continental ever again they have a quality of zero, BONTRAGER ALL THE WAY!!!