Buy Sunlite Thorn Resistant Bicycle Tube 700 x 18-23 (27 x 1) 32mm

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I ride a lot (19.2 miles into work and 19.2 miles home) mostly on closed course bike paths. I've had my share of flats with other tubes but with these... The tubes are practically tires by themselves.

For those who say that these will add to your mile time... When it comes to shaving weight, start with the rider. I'm well over 200# and can still average 20mph into work on the first two rides of the summer. I'm hoping that as the season progresses I'll be able to drop my excess pounds. If shaving 3oz. off my tubes can get me to 20.5mph, by the time I drop 30lb from my less than aerodynamic paunch perhaps I could reach 40mph... or perhaps not.

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I am riding desert roads, and let me tell you what: that they are the nastiest around, cracks, pot holes, sharp objects, and other obstacles. In results, I had 6 flats in one day, since the inner tube was beyond repairs,I came back 4 hours later. I was impressed when I received it, I was expecting a little higher quality inner tube and instead I had ultra thick heavy duty tube, I have been riding it for 60 miles so far without any problems, and decide to upgrade the back also as well, considering the price it is a awesome deal. However one regret, manufacturer should have extend the stem to an extra 10mm, the actual stem size made it hard to inflate on my new alloy rim.

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Seems to keep thorns out but it is a little challenging to install due to its thickness. I hope it gets easier, but, then again, I should never need to replace it, right?

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In fairness this should be 3.5 stars: I rounded down because lots of others gave it 5 but this needs to be noted. Yes... it is very heavy-duty and I have not yet flatted on them--but they are REALLY heavy. Put them on both tires, and you might see your average speeds go down .3-.5 mph. So if you are a city commuter and losing a minute or two doesn't matter... they're great. If you're concerned about pace (not just races: but keeping up with your Saturday morning group...) then note that this IS a trade-off. They take a bit of elbow grease to mount...

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These tubes are HEAVY DUTY! When you receive these, you will be amazed at the quality of them compared to most of the tubes available.

I have not had a flat since installing these, (over 850 miles). I typically ride between 20 and 50 miles almost every day.

I've heard all of the arguments against these tubes. Yes, they are heavier than those light weight racing tubes, but I'll tell you what, If you and I are riding the same race, and we are physically equal, you might be leading me by f seconds at the end of 20 miles. However, if you have a flat, I'll pass you and win the event while you are still repairing your light weight tube. Also, I can skip a snack the night before, and lose those extra few ounces and make us equal again.