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From: Roger Merriman <roger@sarlet.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Patching TPU innertube
Date: 26 Dec 2024 22:32:07 GMT
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Catrike Ryder <Soloman@old.bikers.org> wrote:
> On Thu, 26 Dec 2024 09:45:37 -0600, AMuzi <am@yellowjersey.org> wrote:
> 
>> On 12/26/2024 9:20 AM, Roger Merriman wrote:
>>> AMuzi <am@yellowjersey.org> wrote:
>>>> On 12/22/2024 8:30 PM, James wrote:
>>>>> I got a snake bite puncture on one of my TPU innertubes.  I
>>>>> haven't bought one of the commercial patch kits, so I
>>>>> thought I would try a blob of Aquaseal.  Known for it's
>>>>> usefulness in repairing neoprene stuff and more, I thought I
>>>>> would give it a go.
>>>>> 
>>>>> I tried to rough up the TPU innertube surface, but the
>>>>> sandpaper didn't seem to have much if any effect.  I cleaned
>>>>> it with a little Windex, and after that had dried and I had
>>>>> rubbed it some more with clean tissue paper, I applied a
>>>>> drop of Aquaseal to each hole.
>>>>> 
>>>>> I have the stuff that takes about a day to solidify.  I left
>>>>> the tube undisturbed for at least 12 hours, though I can't
>>>>> recall exactly how long, before putting it back in the wheel
>>>>> and inflating.
>>>>> 
>>>>> This is on my gravel bike, with 40mm tyres that I inflate to
>>>>> 40-45psi.
>>>>> 
>>>>> The repair has held for a few hundred kilometers at least,
>>>>> and now I have put different tyres on the bike, so I
>>>>> inspected the repairs.
>>>>> 
>>>>> The blobs of glue seem to have spread and flattened a bit,
>>>>> but otherwise have appeared to bond well and not leaked.
>>>>> 
>>>> 
>>>> Good choice. I knew nothing about the subject before
>>>> snooping around just now. It seems Aquaseal active
>>>> ingredient is methylenediphenyl diisocyanate which is
>>>> compatible to TPU polyurethane.
>>>> 
>>>> https://www.nrs.com/assets/downloads/msds/msds%202291%20aquaseal.pdf
>>>> 
>>>> https://polyurethanes.basf.us/files/pdf/2019-MDI-Handbook_EL.pdf
>>>> 
>>>> Making a reliable bond unlike a simple contact adhesive such
>>>> as a stick-on patch.
>>>> 
>>> 
>>> Yup interesting stuff, I’d not persisted with TPU tubes, as on the Gravel
>>> bike tubeless has solved that, and TPU seem to puncture just as easily as
>>> butyl
>>> 
>>> I’ve toyed with idea of the MTB as with that and it’s burly tires punctures
>>> aren’t a thing, but on the other hand would one notice the difference with
>>> a TPU tube in terms of feel?
>>> 
>>> Hence I’ve chosen to not fix what isn’t broke for time being.
>>> 
>>> Roger Merriman
>> 
>> "not fix what isn’t broke"
>> 
>> Good plan. Which is why I'm riding the current version of 
>> the 300g tubulars I rode 50+ years ago.
> 
> 
> Changing something that improves functionality isn't the same as
> fixing something that isn't broken. 
> 
The issue for me is that while Gravel tires absolutely do feel more supple
with TPU tubes, these are tires while some claimed sidewall protection,
these aren’t like Trail etc MTB tires which have reinforced noticeable
stiff sidewalls is aren’t floppy, each tire is 1kg or so.

Hence I wonder if a upgrade to TPU tubes would be noticeable, tubeless for
me fails the maintenance requirements ie while it’s my best/favourite bike
I don’t ride it every week as it needs car/train to be worth riding.


Much more really in don’t fix what isn’t broke is my commute bikes both of
which I use tubes and fairly robust tires which generally just works.
> --
> C'est bon
> Soloman
> 

Roger Merriman