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Tufo, Stan's, Other Sealants?(3 posts)

Tufo, Stan's, Other Sealants?triangleforge
Jun 9, 2003 8:21 AM
Mounted up a set of MTB tires last night with the Stan's Tubeless system (quick hint: don't try this in the dining room if you intend to stay married -- I did it in my work room, and it took almost as long to clean up the puddles of latex & thick dish soap solution as it did to mount the tires!)

Stan's Sealant smells awfully familiar after a few years of running Tufo tires & their sealant, and (since it's cheaper) I assume it would work just as well in 'cross tires as the Tufo stuff. Has anyone tried it for that purpose? It seems to have some bigger chunky bits than the Tufo, which seem intended to block up some bigger holes. I also suspect it's the same as the (cheaper still) automotive tire sealants on the market.

Speaking of Stan's tubeless, has anyone tried the system with 700c cyclocross tires? I see he's now offering rim strips for 29-er MTB tires. You couldn't run particularly high pressures (on my MTB tires, there was one hole that wouldn't seal at around 40 psi no matter what I did, but it would hold at lower pressures), but for clincher racing wheels at low pressures, it might be an alternative to tubulars.

29" rims are wider than road rims, right?weiwentg
Jun 10, 2003 6:31 PM
I could be wrong - too short to ride a 29er. but the rim strips might not work if the rims are narrower, which I think they are.
re: Tufo, Stan's, Other Sealants?jw25
Jun 16, 2003 1:58 PM
I'm pretty sure the Tufo sealant and Stan's original mix (1 part latex to 3 parts water) are the same thing. The new stuff has some glycols and rubber chunks in it, to keep it liquid longer and seal bigger holes.
As far as mounting cross tires with a strip goes, there's 2 drawbacks. For one, I don't know the width of the 29" strip, but made to fit Bontrager 29" rims only, according to Stan. You might be able to trim it to fit, or half-ass something with a 26" or 24" tube, cut down (I'm doing 26" tubeless with 20" tubes, so scale up a bit).
The other thing, and this is the kicker, is the pressure cutoff. Apparently, running a tire tubeless stresses the beads a lot more than running it tubed. DOn't ask me why, as it makes no sense to me, but a number of mtbr's have snapped beads in normal tires run tubeless at higher pressures. This is the one achilles heel of the setup - you need higher pressure, since the thinner sidewalls flex more without a tube, but higher pressure makes the bead more likely to snap. In use, 40-45 psi is the highest recommended pressure for 26" tires.
Now, I recall something about skinnier tires stressing the rim less, but whether that crosses over to tire beads, I couldn't say. You could try wire beaded cross tires, but even there, you might be linited to 50 psi or so. I've read of tubular crossers dropping pressure to those levels, but remember they've got a tube in there, but can usually avoid pinching due to rim shape.
So, I guess you can be the guinea pig here. Lucky you - at least you have a workshop - my tubeless experiments get inflated outside, but if they go indoors, they're spraying green goo all over the living room. At least my SO is understanding.