cyccommute 

Nope. No mismatch. It was a tubeless rim and a tubeless tire. I can't recall exactly what the rim and tire was but both had a bead with a "socket" type interface. The bead of the tire was rounded and had to fit into the rounded socket of the rim. The problem was getting the bead out of the rim. That's what broke all the tire levers and necessitated the use of the Park TL-5 steel lever. If you aren't familiar with those, they are about a foot long and beefy. Even with those it was a struggle.

Except when you get coral growing in the tubes. Then you have to take them off.

Perhaps less rolling resistance but not less weight. Tubeless has the potential for less marginally less weight but that would only be if you don't run sealant. The sealant adds 2 oz per tire or 1/4 lb over all. That's a fair amount of weight.

The other dirty little secret about tubeless that no one talks about is related to the need to refresh the sealant on a regular basis. The liquid in the sealant is a glycol...related to the ethylene glycol in an engine coolant system. Glycols aren't known for having much of a vapor pressure so all of that sealant you are "losing" is dissolving into the rubber but not evaporating. It adds to the weight of the tire. Add more sealant and the tire gets heavier. Lose more sealant and the tire gets heavier. There goes your weight advantage.

cyccommute 

Not everyone rides in the land of soft and fuzzy things. The southwest is prickly and has lots of prickly plants. But we didn't think that was enough so we imported Tribulus terrestris from Asia...probably in wheat. It is a caltrop which means that a point is sticking up whenever the seed is laying on the ground and the sharp point is meant to stick into anything that steps...or rolls...over it.

The plant itself likes disturbed ground and doesn't compete well with other plants. However the seeds can lie dormant for up to 50 years and still germinate when the conditions are right. The Wikipedia article says that the plants can grow to about 1m in diameter. I've seen them that are nearly 2m in radius and each one will produce thousands of seeds. The seeds get scattered everywhere and are a problem all year long.

You said yourself that you get one or less flats per year. Do you really think that I was using a tube with 13 patches on it that is 13 years old? I've been on a 15 mile mountain bike ride where there were 4 people with 8 tires and we had 27 flats between us. One of our group had 20...I know it was 20 because she blew through all of her tubes and all of her patches and all that I carry and I carry at least 10 with me at all times. One of our group had tubeless and still ended up with 6 punctures that were bad enough to require constant addition of air to the tires. My wife had one flat...in the tire that I forgot to put a liner in. And I had zero...Mr. Tuffy's work!

...Or work until you brag about how you didn't get any flats. The next time I went on that mountain bike ride, I stopped counting at 67...on one tube!... after hiking the last mile of the "ride" carrying the bike. Needless to say, I threw away the tires and tubes.

Goat heads are nasty little buggers and just be thankful you don't have them where you live. If you did, you'd learn how to repair tubes just to preserve your wallet.