Comments on: A 29″er UST Standard

By: A 29″er UST Standard: An Update | Twenty Nine Inches

A 29″er UST Standard: An Update | Twenty Nine Inches — Thu, 24 Jul 2008 03:49:23 +0000

[...] little over a year ago, I wrote a post here about the coming of UST standard approved tires and rims. I recently got a question regarding [...]

By: Guitar Ted

Guitar Ted — Wed, 23 Jul 2008 18:27:31 +0000

db: Great question. I will address it in a new post. look for that soon!

By: db

db — Wed, 23 Jul 2008 14:43:10 +0000

Is there any word on when we will get more choice in tire? This article is over a year old and still only one tire is available.

By: Guitar Ted

Guitar Ted — Mon, 10 Dec 2007 16:30:43 +0000

SSguy: Well again, Stan’s has to be used with the right tires to get a good, reliable system. If you go with a wire beaded tire, your chances of success are pretty high. I wouldn’t try a folding bead tire myself. That said, I have heard that Panaracer rampages are a good fit with stan’s stuff. Check the Stan’s site for more.

By: SSguy

SSguy — Mon, 10 Dec 2007 16:25:12 +0000

Thanks Ted.

I was hoping that it was as simple as one bad tire. That said, do you feel the Flow rims have the same issues? I know they are not UST, but I have never heard of a blow out on Flow rims and they are often used under sever circumstances. I would like to run a high volume tire at around 30-34 psi for most of my riding.

By: Guitar Ted

Guitar Ted — Mon, 10 Dec 2007 14:45:21 +0000

SSguy: One thing to be aware of. 29″er tubless conversions seem to have a much higher failure rate than the 26″ers do. Something about the bead/pressure/seating angle combination makes it more tricky. Just a heads up for anyone new to this.

I understand the desert scenario. I get to ride in El Paso, TX once in awhile, so the situation is known to me.

Again, the Hutchinson Python is currently the only UST certified 29″er tire out there now for 29″ers. Supposedly Hutchinson has another, more aggressive tread coming out, as does Geax, which will be getting UST certification for use on Mavics rims.

While it’s not recommended to use Bontrager tires (Tubeless Ready) on your Mavic wheels, I wouldn’t hesitate to use them on mine. I think though that once you have a blow off, that tire should be retired. I wouldn’t trust it again for tubeless use. No matter what system I was using.

I hope you find a satisfactory solution.

By: SSguy

SSguy — Mon, 10 Dec 2007 03:36:21 +0000

Thanks for the reply.

Not kidding. I have been daring enough to run Karmas (26) on Crossland UST wheels with stans for extended period without a burb. Kenda, WTB, Hutch, ust, non-ust and other combinations in the past using Mavic 819 and 717, Dt swiss 4.1s without a blip and now I can’t cross town right now without a tire exploding off the rim.

I don’t see running tubes as an option on a $700 tubeless wheelset as an option. I live in the desert, tubes are not an option period. Nor is trying another wheelset a viable option, unless the shop takes the mavics back on trade.

Tubeless ready tires are also not the same as homebrew applications. Am I correct that the bead is similar to a UST, just that Bontrager will not pay mavic for that certification? What is my guarantee that Hutchinson USTs are any better?

By: Guitar Ted

Guitar Ted — Mon, 10 Dec 2007 01:56:38 +0000

SSguy: Never heard of Stan’s blow offs before? You’re kidding, right? That happens all the time with certain tire combinations. I’ve read horror stries for years about that. Believe me, it’s not uncommon.

For what it is worth, I ran ACX’s and Dry X’s on the Cr29max wheels with no issues. Obviously it is not always that way. It also should be noted that the combination is not recommended by either manufacturer. (Bontrager or Mavic)

While it sucks that you have messed up wheels now and a shaken confidence I would recommend that you either use tubes in your Cr29max’s or use Hutchinson’s Python for now. Stan’s works with some tires, and as I’ve said, with others it doesn’t do well at all. It’s a risk no matter how you slice it with that system.

Also worth noting: You could go with Bontrager’s Rhythm tubeless wheels and that system is bomber.

26″er UST is also bomber. Until just recently the UST badge of approval hadn’t been given yet for 29″ers. That’s changed now with the Cr29max/Python combination, but it is the only combo available as of the writing of this comment that has UST approval in 29″er size.

Good Luck!

By: SSguy

SSguy — Sun, 09 Dec 2007 23:40:27 +0000

I just picked up the Crossmax 29 this week to run with the Bontrager ACX TR tires that came stock with my 08 Rig. I have had 5 blow outs over two rides this weekend. You could say that I am not real happy. I weight 210 and tried various pressures from 35-45 to eliminate this. Out of the saddle, off camber…POW! Out of the saddle on a steep climb…POW! My rims are now gouged badly from the tire letting go. Confidence…shaky at best.
I have ran homebrew 26 setups and UST 26 setups for four years and have never had a tire blow off a rim. I have never heard of this happening with Stan’s rims.

By: Martin

Martin — Wed, 13 Jun 2007 12:57:46 +0000

I sit corrected.

More choices are good so we can weed out what really works and what doesn’t.