Originally Posted by
dissemination
If you pack along a previously used tubular as spare and you get a flat you can just remove the flat and put on the spare, of course this is only relevant in road/TT/triathlons when you are not skidding, but people do this in IRONMANs all the time and it is so much faster than changing a clincher.
That really depends on what kind of glue you use and how long the tire has been on there. I've had tires that were really stuck on and took me 5 minutes to get off. I can swap a tube in a clincher in less than 5 minutes.
A lot of it boils down to experience of course; I have fixed more clincher flats than tubulars, but that's not to say that it's always easier/faster.