You don't need to carry tape if you have glued on your tubs, just glue the spare, let it dry, fold it up and carry it. Tub glue is a contact adhesive and the two dry glue surfaces will bond to each other when you need them to.
An alright tutorial here; http://www.bikeradar.com/gear/article/workshop-how-to-fit-tubular-tyres-23929/
and if you've some time on your hands there are 180 pages of tub chat here; http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=72309 tl:dr use three coats of glue on rim and one on tyre, never use tape - that's for wrapping presents.
And finally, don't stretch tubs like the OP it's a nice way to damage your expensive new tubs.
@mustard started
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You don't need to carry tape if you have glued on your tubs, just glue the spare, let it dry, fold it up and carry it. Tub glue is a contact adhesive and the two dry glue surfaces will bond to each other when you need them to.
An alright tutorial here; http://www.bikeradar.com/gear/article/workshop-how-to-fit-tubular-tyres-23929/
and if you've some time on your hands there are 180 pages of tub chat here; http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=72309 tl:dr use three coats of glue on rim and one on tyre, never use tape - that's for wrapping presents.
And finally, don't stretch tubs like the OP it's a nice way to damage your expensive new tubs.