Continental Race 28 700x25-32c Bicycle Inner Tubes - 42mm Long Presta Valve - 2 Pack w/ Conti Sticker

First one inflated and held pressure correctly. The other one had not one but two perfectly round pin size holes about 8 inches apart. Continental needs to improve their QC on their tires.

I should have listened to the other bad reviews. One inner tube busted within the first 50 miles. No nail, no pothole, just busted out of nowhere. Very poor quality control by continental. Avoid these inner tubes.

Also got a leak right off the bet. In my situation I can't even locate it. Gonna try adding more soap into the water. But guys, please, avoid those tubes! It's a gamble with this seller.

One of the tubes had holes in it right out the box. I had read other reviews which had said the same but took a chance anyway. I don't think buying bicycle tubes should be a gamble!! Unfortunately it looks like it is.

Installed tube and it held air for at least first hour as I test rode and put bike away in garage. Took bike out two days later and was flat. When I pumped air it did not stay in tire. Pressure gauge on hand pump went up to a few pounds then back to zero. I removed and reinstalled valve core thinking it might have been a little loose but that did not fix the problem. Did not install second tube. Am returning both.

I don't know if I got a bad batch or what, but I bought these because continental has been around a long time. But on both tubes the valve just shot off while I was riding and left me stranded having to walk the bike home. At first I thought it just one bad tube, but it happened to me twice on both tubes. Never buying these again.

I got a new set of tires for my bike, went from 25 to 28 and decided to go with nice higher end tubes to go along with them instead of the cheaper brands I've been purchasing. On my very first ride I got a puncture in my front tire which ok, maybe it was just bad luck. I replace the front tire tube with the cheaper one and went along again, and at my third ride now my rear tire got a puncture...After I've replaced both tube with the cheaper ones, I have not gotten a single flat! How is that possible.

Continental makes great products. These are no exception. Great value for money from this seller.Only caution, if you're not thinking ahead (like me), 42mm valve stems are barely adequate for 35mm depth rims. Yeah, 7mm is about as much as it sounds... Would be perfect for 30mm or smaller depth wheels. Just wish there was a valve stem length in between 42mm and 64mm.

The extra rubber around the valve stem makes it impossible to lip the tire into the rim making the tubes useless. They seemed durable too shame they cant be used on account of such a stupid design fault. I've changed tubes more times than I can count t and have never run into this problem

They withstand potential snakebites flats (when your tire hits something super rough like a pothole) really well!I literally had my bike run over two potholes and my tires didn't burst, nor did the tubes... maybe I was just lucky, but these tubes make your bike roam fast, and strong! You'll be able to ride confidently with them.

Very good tubes, durable at high speed and for long rides.The order arrived on time as promised and in good condition.