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Loads of people use tubeless for TCR, maybe it's 50:50. Sometimes it goes wrong, most often it doesn't. If it does it's a pain but not race-ending. If it doesn't it saves you time. Basically it's not a major decision to agonise over.
Re rims, Kinlin XR-31s are pretty good. I've bounced my set out of loads of potholes with no issues. But really, most modern, deep-ish section rims are strong enough. I can't recall hearing anyone on TCR have a bust rim, apart from Ultan Coyle who got hit by a car, but that hardly counts. If it did happen would most likely be box section like an Open Pro as they are not as strong as modern wheels.
If I was getting another Alu set built I would go for Aforce AL33 as they seem to be the fastest and strong too.
If I had disc brakes I would have carbon. In fact that is the reason I would switch to disc brakes, so I could have carbon rims for something like TCR without worrying.
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It's worth noting the question was for rims for mixed-terrain long distance riding, not specifically TCR. Which I woudn't called mixed-terrain. Yes it's got a penchant for gravel now, but it's not a significant percentace.
Is there a wheelset or rim that is a clear go to for mixed terrain long distance riding?
Is there a wheelset or rim that is a clear go to for mixed terrain long distance riding?
Also, are there things to be sure to avoid? How common is it for people to be running tubeless on the start line of say TCR?