marting wrote:
An update on my exploits about from 10 pages ago.
Mavic Cosmic UST rims with GP5000TL: Front wheel sealed at the first attempt, though the tyre was a real pain to get on.
Rear wheel never sealed. Despite 3 valves, 3 different rim tapes and me cleaning/filing/sanding every blemish I could find on the rim interior (there were several). And the tyre was an utter nightmare to get on/off each time; no chance of a timely repair in a race situation.
Gave up, and switched to using the same tyres on...
Hed Jet+ rims with GP5000TL: Tyres easy to fit (no levers required - could fit a tube at the roadside if I had to)
One wrap of the HED rim tape. Inflate with tube overnight to bed the tape in.
Tube out, sealant in and inflate with my ghetto tubeless inflator to seat the beads
Pump up to 80psi, give each wheel a good shake to distribute the sealant, and that was it.
Done. First time on each wheel. Zero hassle. Happy days :-)
An update: I had a blowout with my GP5000TL rear on Hed Jet+ rim this weekend. I hit the edge of a pothole hard on a quick descent and tore a hole about 6mm long in the sidewall. The tyre deflated quickly, but it was slow enough that I could stop the bike before it became dangerous. The hole was too big for the sealant to handle alone, and dynaplugging it wasn't quite enough either. So I removed one bead, popped in a butyl tube, refitted the bead, pump/CO2 to pressure off we went. The tyre is scrap, but it got me home without issue.
Some lessons learned: - Removing/refitting the tyre bead wasn't noticeably more difficult than a standard clincher. The sealant might have helped here to lubricate the process.
- It's lucky I was carrying a butyl tube, because a latex tube would likely have squeezed out through the hole and exploded.
- If I carry a latex spare, I'd better be sure to carry a tyre boot too.
- It was a bit messy, but not really problematic.
Conclusion: I'd be happy running this tubeless set up in a race situation. With sealant, dynaplugs, and the knowledge that popping a tube in for larger holes isn't especially slow or difficult.