The final transport and customs clearance costs have now been taken into account and the published prices are final. Quantity discounts have also been added. For riders who are concerned about the weight of the unicycle, these tubes are a cheap and effective weight tuning option.
just remember that these tubes are designed up to size 3.0. I can’t guarantee anything with Duro Crux 3.25. There are no empirical values. But I would be willing to send a test sample for free if someone wants to test it with a crux. But it would have to be someone in Europe so that the shipping costs are not too high. It is quite possible that the tube is not suitable for 3.25" because TPU is less stretchy than butyl
Today a side effect that I have suspected for a long time has been confirmed: With TPU tubes, the tires are more stable at very low air pressures. E.g. If the limit of a tire is 0.7 bar, it can be steered even better with the TPU tube at the same air pressure. It can be driven with 0.1 bar less and the limit is 0.6 bar. At first glance this may not seem like much, but towards the bottom 0.1 bar can make a big difference. But I can’t judge how it works in practice and long-term use. I just drove a few laps around my warehouse and lowered the air pressure each time. It could still be interesting for MUni drivers
You could also note that it is usually said that inner tubes are more sensitive to punctures and pinches at low pressure. That seems not to be the case with TPU tubes. Or, at least, they are way less sensitive than butyl tubes!
I’m still testing and can’t make any statements regarding puncture safety. But it is absolutely remarkable to me that they are more stable to steer at low air pressure. Schwalbe also reports this about its TPU tubes
And linked to this lower pressure, it is also keeping the tire a lot better on the rim in general due to the shape of the tube and how it inflates.
This is of minor difference on good rims but will make a world of difference on sub-par or loose rims (tested and adopted on a fat rim that was on the small/loose side).
I even wonder if a TPU tube would not be the missing element for the riders with a Nextie 36 carbon rim…
If I remember, there was someone here in the forum who offered TPU tubes for 36"? Unfortunately it didn’t occur to me because I don’t offer 36" unicycles.
I also adopted this TPU tube in 36" with the Braus rim.
I had a puncture the day before the 10km of the French nationals…
Apparently the repair went well, but I preferred to replace the inner tube, rather than repair the 1st one and put it back in place.
This tube is 70g less than a 29" butyl inner tube. And it seems safer in terms of blow-out risk.
Re:tpu tubes. They have a good amount of stretch. I’m running a $10 AliExpress one on my 24" uni. It’s sized for a 2.4 and I’m running in a 4" tire (3.3" on the rim) and it has inflated fine. I haven’t done any hard riding but running a 3" tube in a 3.25" Crux should be fine.
Also having used the $10 tpu tube and a $50 from the bike shop, get the good quality ones. The cheap ones are very very very susceptible to pinch flats
I haven’t tested it to its limits and therefore can’t make any statements. They are good for moderate drivers. You should see it in relation to the price. I simply wanted to offer affordable ISIS cranks, not the best and most stable, but good enough that you can practice unicycling with them. For many unicyclists, this quality is enough. If you drive really extreme you should buy more expensive ones. Until now I had assembled and sold the 140mm version to MUnis. There have been no complaints so far. But I don’t know if any drops were made with it. You ask for a comparison. I think the Spirits and M41 are certainly better. But the cheapest ones there are called Unicycle Stuff and are identical. It is 6061 T6 Alu 6066 or 7xxx is more stable
