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All DOWN Cycles MTB NewsMain MTB NewsLocal NewsTech Tips & Reviews
Tech Tips & Reviews
05/24/09
English (US)  
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Professional Tweaks, Tips & Reviews By "AJ" Picarello
I hope you find my Tweaks and Tips section helpful. If there is something you want to know about, send me an email and I will try to add that to one of my upcoming articles.

I’ve been riding with tubeless mountain bike wheels and tires for the last two years. I have contemplated doing a review on tubeless since I’m still a bit perplexed on whether they’re a worthy upgrade over tube tires or not.

I have to admit that the system does work perfectly fine, but I’ve had some issues over the years. These issues are rather serious and they have me second guessing a positive review. I also wonder if they’re worth the investment or if they’re at all an upgrade over tube tires.

First off let me start with what the advertised, so called, benefits of tubeless systems. Manufacturers will tell you that you can utilize lower tire pressure (for better traction) without the annoyance of getting a pinch/snake bite tube flat. I suppose this statement has some truth to it. Fact is: lowering tire pressure in order to gain traction is something riders will not do for three reasons.

One, running low tire pressure (I assume low pressure for XC is below 30 psi) will dramatically increase your chance of burping air from the tubeless tire/rim bead contact area. Burping will occur if you ride aggressive, blast into turns/berms or jump and land on an off camber. Forget about tire sealant preventing this issue. Tire sealant has not helped my tires hold a bead or has it prevented flats do to punctures.

Second, lower tire pressure is a literal drag to ride. The rolling resistance is very severe and is actually dangerous to ride with either tube or tubeless tires. I’m sure most of you have rode with low pressure before. If not, try lowering your tire pressure and go for a ride. Accept the fact that you’re trying this at your own risk. Most likely, you will scare yourself when the tire flops/rolls from the rim. This unnerving sensation is even more noticeable with single ply tires and skinny rims. Flopping tires are also an issue when running low air pressure on large DH style tires. The skinny is, when your tires roll from the rim, you will temporarily have zero control of your bicycle. I don’t care how good a rider you think you are.

Third reason you’ll never lower your tires air pressure is an obvious one. You have a much better chance of denting the alloy rim with low tire pressure. Not only will your rims suffer possible catastrophic damage, your tubeless tires themselves very often snake bite flat. Yes, straight through the tires rubber casing.

So obviously the advertised ability to safely utilize lower tire pressure with tubeless is a bust. What then are the advantages of tubeless? The only one I can think of is that they eliminate tubes. Without a tube, you will never have another tube style snake bite flat. With tire pressures around or above 30 psi, I have had great success with tubeless!

You will become very aware of how often you run over thorns and also how often you weaken the tires bead when you switch to tubeless. A few companies offer tubeless tire repair kits, but frankly, not one has worked for me (and yes I’ve tried them all). The simple truth is, you must carry a tube with you wherever you go and I also recommend a heavy duty section of rubber for side wall repairs. Some duct tape is also a good idea to keep with you to hold that rubber piece in place when repairing side walls.

A C0 2 cartridge does not have enough volume to blow up a tubeless tire on the trail. A compressor is the only way to fill a tubeless tire with a strong controlled blast of high pressure air. You will need to install a tube during trail side repairs.

I’ve yet to wear a tire out on any of my tubeless tires. I’ve had to replace every tire long before it wore out do to damage to the tire casing, rendering the tire useless (unless I ran a tube). This expensive issue is annoying to say the least.

My tires are always low on pressure before every ride losing up to 15 psi overnight (unless the tire is brand spanking new). Pressure loss is hard to detect and almost impossible to repair if you find the cause. Some pressure loss comes from a loose tubeless valve. This is usually an easy fix, unless you over tighten the external o ring, knurled nut and twist/rip the internal rubber seal. (This happened to me while the bus pulled up to shuttle up to LPS in Moab Utah).

Tubeless tire selection is pretty decent. Many award winning tires are unfortunately only available in tube style, such as Stick e Nevegals. Maxxis offers a wide variety of tubeless tires, but still no mud tubeless tires. I’ve been riding the Maxxis Igniters and they seem very good for east coast conditions. They’re great on rock and hard pack and worked well in Moab and at the Kingdom trails in Vermont. They fall short in slick conditions and I wish they were a bit softer. Maxxis XC tubeless are 70a duro.

I recommend tubeless tires to riders who are competitive. Many a race has been lost due to a tube pinch flat. Riders who have a fat wallet and a lot of patience are also good candidates for tubeless. Weekend warriors should stay clear of tubeless. I feel that most riders will suffer with problems with tubeless. Tube systems work pretty well and are pretty easy to work on trail side.

In the long run, most riders will end up running tubes in the tubeless tires. I’ve battled the tubeless system tooth and nail. As of now, I have a leaky tubeless Igniter on the front of my bike and a Cross Mark on the rear with a tube since the tires bead is weak, not enough to bulge the tube, but just enough to leak all the air if set up tubeless.

In other words, I’ve been beaten by tubeless tires. I have surrendered, forced to run tubes inside this sophisticated, brilliantly engineered, tubeless work of art.

2 Updates

Updates

weaken the tires bead? huh? I mount tire by hand and have removable core valves to add stans sealant so why would the bead weaken? I have very rare failures with UST setups, 3 flats in 9 years and I ride at least 3k a year on my two bikes...one being a commuter/trail bike hardtail. I rarely have a problem with pressure loss and if I do it is quickly repaired.I do feel it is an advantage to be able to lower to minimal tire pressure for certain terrain..at least the option is there? I wouild never return to tubes...UST is a well designed system carefully researched by mavic and hutchinson.Are most downhill pros running tubeless?

Update from: dave chavez [Visitor] — 03/28/10 @ 14:04
The tire bead can weaken from people who don't know how to properly install tires. Only experts can install tires on a tubeless rim by hand. Let’s face it, 90% of the riders out there will mount and dismount tires with metal or plastic levers. Damage or deform a tubeless bead and you have yourself a leaker.

Riders who are mellow and stay glued to the ground will have less of an issue burping a tubeless bead. Obviously the more aggressive you ride, the more chance of disrupting the bead to rim interface. Dent your tubeless rim and you are on tubes until the rim is replaced.

I still have tubeless on my hardtail for testing. I've been on tubeless for 2 seasons now. Never did I get the full life out of a tubeless tire. I always get casing punctures long before the tire wears. Stans will not seal the holes even though they are small.

I have tubes on my GT sensor. I have a full season on the bike with only one rear flat (snake bite, 2.1 DTC Nevegal). The tire seemed OK, just needed a new tube, back on the trail in 5 minutes.

I'm still leaning towards tubes when it comes to trail riding. I feel that tubeless is appropriate for XC racers and that's all for now.

Thank you for your comment! I'm very interested in rider’s opinions on this topic!


Update from: ajdowncycles [Member] · http://www.downcycles.com — 06/24/10 @ 21:08

You are not authorized to write a update.


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