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I'm thinking purely from a race situation. TABR is ~4000mi. Can I get through it with a single set of fast tyres? Tubed tyres I used fast rolling ones and swapped half way. If tubeless are a bitch to change I'm not sure I'd want to do this swap using fast tubeless tyres.
Advantages during training rides of tubeless 'outside only' repairs would be not having to get road grit shit all over myself as I do when changing a tube. This is of course assuming I learn to successfully repair these weird tyres...
hippy-
fusion x-guard and RBCC life is more like 10,000+ km for me on the race bikes on the commutor which has load the rear tyre does around 7000-8000 km. the front tyre on my commutor has nearly 10,000km and the file thread is barley worn. They will do 4000 miles easily unless you are 120kg hippy.
One TCR rider finished on IRC fusion X-guards. She had no issues. I am hoping she will send me a pic of here tyres so I can how new they still are. I think he had to top up with air in bulgaria or romania.
cycleclinic
permenant in my expereince. Had one tyre with two worms in it and glue for over 3000km. if it failed I would have patched from the inside. That tyre had two patched from the inside two. I put that tyre through the mill to find out how much abuse they can take. It had a sidewall cut that I fixed too. it did 7000 miles before I retired.