Conti GP5000 TL - R&R

I ran over a cluster of goat-heads when rolling away from a pedestrian stop-light button and picked up 3 goat-heads. I coasted to a stop while leaning the bike so the side they punctured wouldn't contact the road. 2:3 came out without penetrating the tire, but the 3rd one went in oriented across the tread and made a small puncture. The tire would still hold air for 40-50 miles, but I'd lose about 5psi, and it continued to seep sealant, so I decided to try Stan's Race Sealant on the recommendation of a friend, and see if that would seal the leak.

I'm not a fan of just adding more and more sealant in the hopes it will eventually drown the leak, so I removed the tire and set about cleaning it. I discovered that public car washes that use pressure washers do a great job getting tire sealant out. You get a completely clean and toothy tire ready for more sealant. If you can't get it to seal under pristine conditions, you're never going to get it to seal in the wild, so this is the best way to seal a slow leak.

What was left in my tire was a clear, somewhat sticky, gelatinous liquid that keep leaking out of the small puncture, but it contained no sealing beads/bits, so it was incapable of sealing the leak. This creates a dilemma because the sealing bits that plug the hole are all stuck to the tire, but to add more sealant you need to release all the pressure, and when you do this with the Conti 5000 TL it lets go of the bead, so you have old sealant stuck in the bead, and all over the inside of the tire, and you have to reseat the bead. That tire is never going to seal up well. The old sealant creates all kinds of gaps along the bead. The only solution is to thoroughly clean the tire, wheel, valve and re-tape the rim. That Conti's TL always lets go of the bead is a design problem.

Unfortunately, this time the tire came out with a lot of damage to the bead, inner casing, and sidewall, in spite of not washing the sidewall per-sec, only the inner & outer bead. Last time, at a public car wash, no damage at all. Hummm.

I should have done this before, but after letting the tire dry in the sun and inspecting it, I Googled to find how much pressure public high-pressure car washes actually use. It looks like 1,200 to 1,500 except for trucks, which can get to 2,200psi. The washer I used was borrowed from a generous friend and is rated 1,800psi, which, combined with a very narrow nozzle turned out to be too much in this case. I think if I had used the 45 degree nozzle, instead of the 25 degree, I would have ended up with a very clean but undamaged tire.

RX the 40 degree, not the 25 degree nozzle

Pressure washing is BY FAR the best way to remove old sealant, but do it right away before it has a chance to dry on the tire, and maybe even soak overnight in detergent soap. At any rate, I decided to take this opportunity to revisit my RX for installing the GP5000 TL tires, as this one was a new, but an older production 25mm tire and was crazy hard to get on. It took every trick in my book to get it on, but it did go on without damage, and no bead seating or leakage problems. Either Conti has some serious QA problems, or they have changed their spec, and loosened the bead somewhat. As the last two I've put on - one a 25mm, and one a 28mm - have both gone on easily, I'm guessing they changed their spec.

The tire held 90psi from an initial 110 psi after 20 hrs. I assume that was mostly from the tape seating into the spoke holes, the tire expanding somewhat overnight, and a small amount of normal leakage through porous rubber and around the bead and stem.

If you're here burning daylight trying to get out the door for a ride, I'll cut to the chase. Here's were I ended up getting this incredibly tight & difficult tire mounted. Njoy!

Zip-ties are like another set of hands +1

KoolStop tire jack played no role in finally getting the tire on

Obviously a LOT of prying was done to get the tire bead up & over the rim's edge. PBS tire plastics are great because they have a groove that engages the tire's bead so you can push the bead up towards the rim's edge a bit before starting to pry. I tried using the KoolStop tire jack, but though it took yet another bite out of my rim's decals, I was unable to get the bead over the edge of the rim using it. The ZipTies on the other hand were priceless. They absolutely work, every time, all day long. I cut the ties loose from L2R from the valve and the tire settled into the center cavity like magic.

As per my prior post on mounting this tire, mounting the 1st bead starts at the valve, but the 2nd starts across from the valve, keeping both beads pushed down as deeply into the rim's center cavity as possible as you go, finishing up at the valve where the beads are forced outward around the valve's base. Sans the valve area, both beads were hard against the center cavity at all times. This was one tight tire! The Zip-ties keep the tire from crawling down the rim away from you all the time. A really great discovery!

Tire Cleaning Procedure:

I guess I should say right here that pressure washers and rims should never meet. You don't want to get water inside the rim, remove the LocTite on spoke heads, or get water under the airtight rim tape. You also don't want to risk damaging the bearings by blowing water and grit past the seals on the hub's bearings.

So what to use? Alcohol, a tire plastic, a stiff cloth and some elbow grease.

Valve Cleaning Procedure:

Always clean the valve thoroughly before installing it again. This includes the inside of the valve body, the rubber seal, and the tapered seal that is pressed against the rim-tape. My SO bought a set of stainless steel straws (a little hard on the teeth IMHO) at BigLots and they came with a cleaning brush, but I see Amazon sells these brushes stand-alone.
 

Used valve body. What a tiny passage!

I prefer to clean the seals with my finger tips. For the black one pictured above, use the stippled nut that holds the valve closed to turn the stalk counter-clockwise (the "Open" direction) while holding the seal between your index finger and thumb, (or whatever method you prefer) and just rub the sealant off as gently as possible. Those are some very delicate seals, so tread lightly.

New valve. White Teflon & black rubber seals showing

Given that all the air or CO2 you'll ever put in your tires has to go through this very small passage, it should be obvious how important it is to keep both this and the stem clean. It's also the reason I had to use all High-Flow connections and couplers on my 120psi air-compressor system to insure a quick bead-seat, which it does without fail.

SS drinking straw cleaning brush

White plastic bead on tip is go/no-go sizing device

 

Damaged Goods:

Though I'm pretty sure this tire could be mounted and it would hold air, it has a lot of damage, especially to the bead area. The threads showing through almost everywhere on the sidewalls are disturbing, as are the strings/chords/fibers showing through on the inside of the casing. There's also quite a bit of rubber missing from the ribbed area that runs from the center to the bead on the inside of the tire casing.

Those ribs are probably one reason this tire has such low rolling resistance, and give the tire such good sidewall strength even when going flat. By contrast, the inside of Schwalbe's tire looked like a golf ball, with thousands of tiny dimples.

I'm sure some of the damage you see here was done by the pressure washer, but given that Conti's TLs always let go of the bead, there's no option of injecting more sealant without having to re-seat the bead on top of old sealant, or remove the tire and clean everything thoroughly and then reinstall the tire - which I still think is the best option. 

Lots of bead damage

Sidewall and bead both pretty chewed up

Extensive damage to the bead area

This looks like puncture damage

Cracked rubber and loose threads

This could be damage, but the hole looks too clean

Note the casing ribs

Why are these casing threads exposed?

Not the bead surface that engages the rim, but still...

Sidewall chords showing around the entire tire

Note tread-wear dimples

I think you can see why I chose not to remount this tire. I am keeping it as a spare, but you can see, it is far from being used up based on the tread-wear dimples. My only consolation is that this tire did yeoman's work for almost a year and performed brilliantly.

I still think the Conti5kTL is the best thing going, but I would like to see some guidance from Conti about cleaning, mounting and caring for their TL tire, and hopefully, find a way to get the bead to hang on at zero pressure. To that end, I hope someone from Conti reads this report and the company responds in a helpful way. I'm a huge fan of the tire, but groping around for solutions to problems is getting tedious.

Cheers!

PS:
Thirty mile ride today and happy to report the new tires roll better, soak up bumps better, and do a better job of killing road-buzz. As much as I like the wear dimples, I'm going to set my own minimums for these tires based on visual inspection and road feel. I have no doubt a 25mm on my back wheel would wear out long before these became issues, but not on the front wheel. Very happy with my decision to replace the tire. Already ordered another 25mm as a spare. The old tire is getting tossed.

Also should report, it may be the Stan's Race Sealant, but the tire lost ZERO psi over the last 48hrs. That's a first for ANY tire for me.

Indian Summer

The weather was really nice here last week, in the 60s and even low 70s (down here in the valley anyway) so I sucked it up and put in some ride time, logging over 120 miles in a week, not my best week by far, but my best week since moving down to SoCal in 2015, so a lot of time looking at this view.

Apple Valley Airport. A favorite hydration stop

I was stopped for a short break, against a sun-drenched wall out of the cool breeze when this guy happened by on a trike. I saw him 6-7 blocks away, and was surprised at how visible he was, both front & back. Love the little bits of serendipity when out riding. We waved and shouted a greeting and he was gone.

 My, how time flies! I can't believe I've been here (almost) 5 yrs already! Apple Valley, Victorville & even Hesperia have come a long way in making this area more cyclist-friendly. The big, signature piece in that was putting in 3 nice river-front segments called the Mojave River Walk (there is a 4th in North Victorville, but it isn't connected) They've also put in a short segment of bike trail up to the VVC campus, but it's pretty steep.

Victorville has also installed small repair stations (they were badly vandalized in Sacramento, so watching this with interest here) and near VVC, a small park & picnic ground with drinking fountains - two of them. This one right along the river walk Surprising how often this critical piece of infrastructure is overlooked, especially here in the high DESERT, so check this fountain out!

Elkay drinking fountain with bottle-filler

I've never seen a bottle-filler in a drinking fountain, and am glad it's in full sun, which is what sterilizes ALL public drinking fountains, because the nozzle is shaded by the top of the fountain, but the bottle medallion is reflective, and the water was clean, city water. There's also a doggie fountain about 6" off the ground, which we also appreciate. It's hot and dry here, so simply taking a drink is not enough to keep you hydrated, you need to carry water on you, so this makes perfect sense. Sacramento, are you listening?

The newest of the 3 segments of the Mojave River Walk skirts the Mojave River Narrows, where the Mojave meanders through a low, flat swampy area and comes up through springs to make nice, little lakes like this one. 

Mojave Narrows Park

I've also been working on my nutrition a bit, and am happy to report that the Elderberry gummies are as effective an anti-oxidant and anti-inflammatory as the USDA claimed they were (they stopped publishing anti-oxidant values because it was abused for commercial purposes, but I have a screen print of the table somewhere). Much more effective than ibuprofen, heart-friendly, gut friendly and a big boost to your immune system.

My bike is creaking again. It's the headset. The crown race I'm pretty sure. I bought a new one, but haven't installed it yet. I think the Cane Creek 110, guaranteed for 110 yrs, is defective in that the crown race isn't rigid enough, but I will need to inspect it carefully when I tear it down. The blue paint is worn off on 1 side for about 60 degrees around. I assume that is the side facing the down-tube, but I won't be sure until I get it apart.

Very cold last night, down to 17 degrees here in the valley, and only in the 40s today, with 70s the next 3 days, so debating staying home and fixing the creak.

I haven't ordered it, but I'm going to add another IRBM mirror to the right handlebar end. Too many times I'm at an intersection unclipped and can't see behind me, which is bad now that there's a lot of construction going on and cars are having to squeeze by. Tic, toc.

Ciao!