I have 3 old Schwinn's, a Speedster, Breeze, & a Collegiate. All use the same tires & tubes for the Schwinn S-6 rims. The Kenda tires & tubes have been good. My only issue is that after a couple of years of service the glue or whatever seems to let go on the valve stem & you will feel a small blister or bubble on the lower valve stem, it will blow out. This has happened twice to me in the last year. Fortunately I was home when they blew, & not ten miles away from home.
Tubes today are porous & Iose 5-10lbs. of air per week. Now when I air up the tire weekly, I check the valve stems for the bubble. I rode 900 miles this summer 2015
Since I have had an impossible time getting a patch to stick to this Kenda tube, even though the price was low, it probably wasn't worth it because I can't patch a puncture. It's a throw-away product.
Also, even though I alerted the company that the valve step was NOT 32mm, as advertised, a month later I see it is still advertised as a 32mm (that is, unless they get a stock of 32mm valve stem tubes in stock)
I am a small bike repair shop. I buy and repair used bikes and sell them. I also repair customer bikes, Sometimes they are old classic bikes, sometimes they are top of the line new style bikes and I need parts and tires for all styles.
one of the two tubes purchased burst on when inflated first time
First tube worked great and no flats for an entire year. This year I ran over a goat head so I had to finally change a tire. Next two tubes had issues out of the box. First one had a weak wall and had a huge bulge in the tube. Second tube had a defective valve that I didn't notice till it went flat again. Hopefully this third tube will last a little longer until I get my next shipment of new tubes!
I would have returned them except they are less than the return shipping price. I was able to shove them in the tire by doubling them over for a few inches but it was a lumpy ride and I found an actual 20 tube at a local bike shop.
I am not actually sure what size they are but not the 20 advertised.
Over 35 years I have installed hundreds of tubes on family and friends bikes. It seems the tubes of late are getting worse. I don't know what the composition of rubber is but I am ever finding patches won't stick to this crap.
As cyclists we should demand at least a tube that holds air when installed. I use tuffy liners for most installs and don't feel the need for the higher priced tubes. But at the very least, I want them to hold air for the initial filling.
One of the tubes you sent me, specifically the 20 x 1 18 tube, had a leak out of the box and I had to re-use the tube that I already had. Luckily it was in good condition. Otherwise, the tires work great and give me added speed with my 45lb LWB recumbent.
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These nominal 26 x 1 3/8 inner tubes are a bit narrower and greater in circumference than tubes in the past were. At first, I thought that would be a bad thing because more stretching would be needed to fill the inside of the tire. Yet after installing some, I have realized that it made it easier to get the tire onto the rim because the tube tends to stay up in the tire more during the process. Put just enough air in the tube to allow it to hold its circular shape and that will help to keep it up in the tire and help prevent kinking of the tube. These are good tubes to keep my favorite classic ten speed bikes rolling.
Bought these tubes to replace one on a pull cart that had a bad tube. Decided to replace both tubes at the same time. Unfortunately one of the tubes had a hole in it and leaked air. Lucky for me one of the old tubes was still good and I was able to re-use. Customer service is non-existent for Bike tires direct, no reply to my Email regarding this issue. I did enjoy my other purchases on this particular sales order, but based on first impressions, I will probably not do business with this company for any future cycle needs.