I've been testing the Aeron TPU tubes most of this season already. The last update came back in early May. Then the whole BRAN thing happened and I was off doing things in preparation for that trip. Now that I'm back in a regular routine again I have had time to do an experiment with the Aeron tubes to check out something I was curious about.
That being how an Aeron tube would respond to being taken out of one tire and being put into another. Would the tube be too stretched out to use in a smaller volume tire? Would the TPU be stressed or damaged easily by handling it after having been inflated and ridden a while?
To learn the answers to these questions I took the front wheel I had been using with these tubes on my Black Mountain Cycles MCD, a wheel with a WTB Nineline 29" X 2.25" tire, and swapping that Aeron tube to a narrower tire. I also decided to go with a different wheel as well, just to make this even a bit more interesting.
The tire I chose is a Rene Herse Fleecer Ridge 700 X 55mm tire. The Fleecer Ridge is actually a bit narrower than claimed and in inches would be a 2.1" tire, so slightly narrower than the 2.25 WTB tire, which measured out right at its claimed width.
The wheel changed from a WTB Proterra i23 to an ancient HED Belgium+ design rim called the Ardennes wheel. It is slightly narrower than the WTB rim internally as it is 21mm internal width. With an obvious change in inner rim profile and a narrower tire, would the Aeron tube be compatible after having been in a larger space?
Removing the Aeron tube, I noted that it felt very delicate. Maybe it thinned out a bit? But when I aired it up enough to give it some shape for installation in the Rene Herse/HED combination, I observed that the tube was not oversized for the new application. Installation was easy, but it was a delicate operation. It should also be noted again that these Aeron tubes are spec'ed to work with 650B diameter tires as well as 700c tires. The tube was not stretched out to a 700c diameter requiring a bit of finessing to get the tube into the Fleecer Ridge casing.
My conclusion is then that - at least for the Aeron TPU tubes - they do stretch to fit a larger tire but they do not stay stretched out if removed. These examples, at least, show some return to original size out of the box, despite their feeling thinner than new as I recall things.
This is an interesting finding since it would seem that, as long as one handles the TPU tube with care, Aeron TPU tubes can be safely transferred from one wheel to another. The main point being that you have to be very careful with the TPU material and see to it you do not damage the tube by removing it and reinstalling it.
So, I think the Aeron tubes retain their shape to a degree that you can use a tube from a slightly larger tire and put it into a slightly narrower one. However; I do feel it would be rather easy to damage the TPU material while doing a swap-over.
More riding will be done soon and I will return with another update later into Summer.
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