2-PackSPINGO TPU Inner Tube 700C x 35c-43c with 48mm Presta Valves Gravel TPU Bike Tube Lightweight Bicycle Spare Tire

Good quality, super light

Love these inner tubes! They are really light and easy to install in my mavic wheels - as shown in last 2 pics. The valve stem is really long and easy to attach a pump to. But my favorite part is the tubes have a small deflated volume and take up mush less room in my spare tube/flat tire changing bag under my saddle. My sprinter's thigh don't rub against the sides of the bag anymore rainy shorts! Great tubes!

They are lighter than butyl rubber but this brand was not tougher. 3 flats on 1 ride!! I have never had that running latex or buttl rubber. These are very cheap! Tube quality very poor.

been riding on them for a few months. they lose air quicker than butyl, but have been happy with them so far.

Most 700c TPU tubes on the market specify use on tires between 18 and 32mm.This is a wider range that what is usually specified for butyl tubes, meaning that TPU tubes will be stretched pretty thin when used with the 32mm width tires that are ever more common on Road and All Road bikes these days.I’ve been using 18-32mm TPU tubes for a while on 32c tires and have found them reliable.But another option that may lead to an even higher level of reliability would be to use tubes where the MINIMAL tire size is 32mm rather than the maximum tire size. In that case, the tubes will be stretched WAY LESS and can be expected to maintain a much higher level of puncture protection and overall strength.That was why I wanted to test Spingo’s 32-47 mm tubes with 32 mm tires.Here’s my take on these tubes:PROS:Un-inflated diameter that will fit 32mm tires perfectly. About 5-7 mm larger diameter than 23-32c TPU tubes.Heavier gauge TPU material that is used on the vast majority of 23-32c TPU tubes.54 gram weight per tube, which is about 20 grams heavier than many TPU tubes that will fit 32 mm tires, but still about 80 grams lighter than lightweight performance-level butyl tubes.Very heavy duty valve stem to tube juncture. One of the best I’ve seen and I’ve tested more than a dozen TPU tube brands.Likelihood of way less air loss over time than would be the case with standard 36 gram TPU tubes.Few riders these days use 18-23 mm width tires, but LOTS of riders use 32, 35 and 38 mm. So these tubes may be more versatile for those who ride modern Road/All Road bikes with wider rims and tires.CONS:Polymer valve stem that seems poorly-constructed compared to the valve stems on many other TPU tube brands. One of the Presta valve locks on the tubes I’m testing completely unscrewed from the valve, which was easy to repair, but should not be necessary for the user to repair. On a relatively heavy TPU tube, why use such a lightweight and mid-level quality valve stem?The Amazon posting specifies that these tubes will fit 32mm tires. The material that comes with the tubes specifies that the minimum tire size is actually 35mm. There is always variance in actual vs specified tire diameters, so unless you know that your tires are narrower than spec, I think these tubes should work for your 32 mm tires.~~~~~~~~~~~~~~~~I have yet to do extensive reliability/longevity testing, but my initial sense is that these tubes are likely to be significantly more puncture-resistant, hold air better, ride just as well and overall be more reliable than comparable TPU 18-32c tubes. I have installed them on an All Road bike and will update this review if they prove to be less reliable than expected.

So far, so good.Inflated both to 4.5 PSI and left them for at least 24 hours. They seemed to hold pressure and, with a bit of effort, were able to deflate and fold back to original compact size. They are my spares so we’ll see how they perform when needed but space saving for storage is very nice.I’m not sure, yet, about the quality since one of the stems wasn’t quite centered on the inside of the inflated circle but I’m hoping that won’t be an issue when installed. If it is, I hope it’ll get me as far as a bike shop.

So far very impressed with this product. I was warned about TPU tubes that they are not known for their reliability. However, in my experience this is not been the case. I've been on multiple gravel rides and these have held up well! No problems whatsoever!

First 2-pack both tubes bad. One had a crack on valve core (not sure if the test them- quality control). The other one has a slow leak, put under water and the hole is at the bond of the tube (not the valve interface).Replacement seem fine, both inflated to 15psi and held for 3-days, install on wheels inflate to 60psi and held for 3-days.Main issue is the VERY fragile valve stem, can not recommend these.