Struggling find a source for decent tubes in both presta and schrader valves in 700x35-45 range. Any recommendations as to brand/source? All started with trying to help my niece. Front tire kept going flat over a matter of days. Kenda tube. Found a weeping leak, replaced it with a second Kenda they have her when she bought the bike. It too leaked down in less than a week.
I ordered a couple of tubes from REI, turns out they're Kendas as well. Put one in, fingers crossed. Not liking this cr@p shoot business.
​​​​​

https://www.backcountry.com/continen...NjZXNzb3JpZXM=

Thanks. Covers Presta valves, Schraders harder. Seems like these are becoming rare as Hen's teeth.

In general, most tubes will last a long time regardless of the brand. Based on your description, the tubes are leaking shortly after installation. Have you been checking where the tubes are leaking? There are many things that can cause a puncture in a freshly installed tube including debris (thorns, cactus needles, glass shards or small pieces of wire) that may be hard to detect, but unless you remove them from the tire, it doesn't matter what kind of tube you put in as it will get punctured the same as the tube before. I've been a bike mechanic by trade since the early 80's plus I commute and ride a lot as well. I fix many flats daily and I made a video of the most common things I see that cause them with some tips on avoiding flats, as well as a video on experimenting with tubeless sealant inside the tubes that have personally eliminated flats for the last year and a half for me.

I must agree with Le Mechanic. I had a problem with my front tire constantly flatting about every 50 miles or so. After about five times, I finally realized it was a bad rim tape job & the tube was getting into the spoke holes. Got some high quality Schwalbe rim strips & hopefully won't have that problem anymore.

I agree with the folks above; check the rim tape, tire and rough spots inside the rim. My wife and I have toured over 25,000 miles using Kendra tubes, and have not had a significant problem with them. I use Kendra tubes because their presta valves have replaceable valve cores. IMO this is important when using presta valves.

I had a similar siuation like the OP described. I ruinded a wheel on a tour by hitting a piced of metal in the road while going pretty fast down a hill. I was able to get a replacement wheel at the next town, and felt pretty fortunate. However, I started to get a flat tire about once every 60 to 80 miles. I looked at the tire and checked the rim strip on the new wheel, but couldn't find anything. After the second flat, I noticed that the hole was about in the same position in relation to the valve stem. I then ran my hand around the inside of the rim, and found a sharp rough spot at the joint of the rim. I used the sandpaper from my patch kit to smooth it out. That took care of the problem.

I almost cried when the mechanic cut my hub out of the wheel.
[

Do the tubes you’re having trouble with have presta valves? If so, they may have loose valve cores. Look for flats on the threads at the tip of the valve and tighten with an adjustable wrench.

Rim tape is first place to look and with your hand feel around the entire inner rim for any bad areas that are snagging possibly from a faulty manufacturing process.

I have found super cheap tubes to be as good as a high end tube. That said, my last tubes I bought were no name and have been doing great so I can only say each person’s mileage varies here. Good luck.

I generally buy the least expensive tubes I can find and have had no issues. Flats, slow leaks, tubes failing with a bang ... with few exceptions, none of these are the fault of the tube. On rare occasions I will have a presta valve fail, either at the core or where it attaches to the tube.

Leaks can be patched. Use a good quality patch kit (I recommend Rema TipTop) and learn the skill.

If the rims are drilled for Schrader, you can get rubber bushing to adapt that rim to a Presta valve.

(But find what's causing the flats first. If you leave a wire/thorn/etc. there, it'll flat any tube.)