I just carry a tube and a MTB co2, I think 21g. Would you put sealant in a spare butyl for a road bike?

If you set up the tubeless system properly the odds of getting a flat are very low. I ride in Phoenix where thorns and sharp rocks are everywhere. Before I went tubeless I used to frequently get flats. I went tubeless about 7 years ago and in that time have never had a flat. I have had some struggles getting the tubeless system working properly but once set up it works.

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Andrew Inkpen

Plugs, "Worms", "Anchovies", every place has it's own slang for these:



Personally I carry them in the form of the Sahmurai SWORD, which hides neatly in the handlebars. A lot of the punctures too big for sealant can be sealed with these - ream, stick, inflate if necessary (you can often plug quickly enough not to lose significant air!) and move on. In XC marathon racing these are considered standard equipment.

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ZONE3 - We Last Longer

Oh yeah, I totally forgot about those. Thanks!

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Zen and the Art of Triathlon. Strava Workout Log
Interviews with Chris McCormack, Helle Frederikson, Angela Naeth, and many more.
http://www.zentriathlon.com

You can also get foam cores for MTB tires. Never used them myself but it seems like you you should be able to get something that doesn't contact the tire (so presumably no loss in RR) but means you aren't running on the rim if you puncture within sight of transition. Not a recommendation but it's something I'd find out about.