Poof! Just Like That!

Current state of the Fargo Gen I

 Since the Ride For Jacob on my Fargo Gen I, I haven't ridden the bike much. I wanted to make a couple of changes first. Now that the two main things I wanted to do have been taken care of, I can share the outcome with you all here. 

The first order of business was to swap out the 180mm XT crank set for the 175mm crank set seen in the image here. I also wanted to swap wheel and tires, but this took a strange turn recently. 

See, I did not have any tires I was jazzed about using. Plus, I thought I really wanted a fancy wheel set for this bicycle. I'd be talking about hundreds of dollars just to satisfy a whim. In other words, I could not really afford to do this just now and I did not have anything by way of tires in mind at all. 

A week ago, on Monday, a dear reader of this blog donated a bunch of items to the Cedar Valley Bicycle Collective. One of those items was a set of tires. 700c X 2.2", to be exact. A size we at the Collective would probably rarely - if ever - use in the next year or two. Instead of having these two tires just sit around taking up space, I purchased them. 

The tires? Ironically they are Rene Herse Fleecer Ridge tires in the Endurance casing. They had been used, for sure, but they were in very good condition otherwise. Now, all I needed was a wheel set. I barely have any quick release wheels anymore these days! 

But I identified a set which came on my Raleigh Tamland Two. They are not real heavy, but they are not lightweight either. Not in terms of what is out there now which one could purchase. So anyway, I set up the Fleecer Ridge tires with a WTB TPU tube in the rear and a standard butyl tube up front. Now it was time for a test ride. 

First thing I noticed was the vibrations these tires produce. I could feel it everywhere- saddle, pedals, handlebar. I set the tires up at 30psi and was riding in 40° temperatures. The Fleecers rode fast on pavement but on my gravel sections it was tough since we had an inch and a third of rain. This made the tires cut into the surface on unpaved, gravelly bits. 

I decided the unpaved areas were too soft to really get a read on the tires, so I bailed and hit the City side streets. About a mile from the house I heard a "pfffft-ssssssshhhhhheeeeeeeah.  

Poof! Just like that. A flat tire!

See anything missing here? (Check area around where the arrow is pointing)

 Okay. Great...... I cannot remember the last time I had a flat tire. Was it the tire? The TPU tube? I didn't know, but the irony of what I have said about Rene Herse tires was not lost on me in the moment. I turned around and took the walk of shame, a mile back to the house. 

Once I was home I took the wheel off, peeled back the tire, and started pulling the TPU tube out. I figured I would make a mental note of the relationship between the valve stem and the hot patch of the tire as I pulled the TPU tube out. Then suddenly I noted something. 

There was no valve stem!

Upon further investigation it was apparent the plastic valve broke off at the very bottom of the base of the TPU/valve instantaneously dumping all the air out of my tube. It was a failure of the TPU tube, not the Fleecer Ridge tires. 

Phew!

So, this was good news. Now I am not too impressed with the WTB TPU tube, I will say that. Note: There was no valve nut to force too much pressure, pulling the valve apart because the plastic valve is not threaded. This wasn't cut by the rim, because it was obvious the plastic was broken down inside that sheath you see still protruding out of the TPU material. It was an irregular, crystalline looking break. 

No, this was a failure of the material. So, a new thing for me. I've never seen anything like this before. It is but another reason I think TPU tubes need mechanically connected, aluminum threaded valve stems. I think TPU tubes are really great, and I will continue to use them, but these early efforts at TPU product are not without some growing pains. 

On the other hand, later on I remembered hearing something, (maybe a stick?) , tinkle through the rear wheel not long before the valve stem failed. Maybe whatever that was knocked the valve stem? It is a possibility, if what I heard was what I thought I heard. I did not stop or verify this, as things like this happen all the time and unless I feel resistance in the drive train I tend to let things like this go uninvestigated or at least they are of little concern. 

N.Y. Roll said to me on the phone when I was telling him this story that he was glad I was taking these chances so he could learn from my misfortunes. 

Hey! Someone has to do the testing!