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Old 01-08-2013, 09:40 PM   #1
FakeName OP
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Ultra heavy duty tubes on the street

Forgive me, I'm big bike n00bish.

I'm buying my first set of tires (606/908)for the 990, and the website from which I purchase tires warns that UHD (or even HD) tubes should not be used on the street. While I often ride the road between dirt destinations, I've been using UHD tubes on the 525 for years without event.

Is there some reason about which I'm ignorant that the UHD tubes are a hazard on the big bike, on the street? I'm sure "heat" is one possible explanation.

Thanks.
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Old 01-08-2013, 09:58 PM   #2
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I recall hearing that there were heat buildup issues at the speeds the big bikes are capable of, probably a fear of lawsuits or something if one of them fails at some seriously high speeds. I guess tubes move around a bit inside of a tire carcass, and the heavier tubes probably build more heat.
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Old 01-08-2013, 10:04 PM   #3
srad600
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I don't really know what the supposed issues with UHD tubes are but I do know that I run (and have run for the past 7,000 miles or so) Michelin UHD tubes in both my tires. I've also run the bike at some serious speeds (80+ offroad , and well over 100 on tarmac - closed course of course ) with no issues so far. The high speed riding is irregular and of course, something bad could happen one day...but so far no issues.
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Old 01-08-2013, 10:27 PM   #4
buzybraza
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I have run UHD tubes on my SE for over 6k miles exclusively on the highways with no problems. Several + several sustained hi-speed runs (for me anyways...) 100+ mph.....
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Old 01-08-2013, 11:04 PM   #5
BartG
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dont run them soft on tar with heavy loads for long times, they do get VERY hot. I run at a higher psi on tar anyway and never had a problem...

Do find the wheels balance with more difficulty though making my ride less "smooth" at higher speeds.
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Old 01-08-2013, 11:45 PM   #6
corndog67
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I do recall one time, on an XRL650 that was all hotrod, and would cruise at close to 100, that when I pulled a tire off, there was all this rubber dust in there, and a mechanic/tire guy told me that was the tube moving around at speed, grinding itself apart, maybe that is what they are trying to avoid.
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Old 01-09-2013, 02:45 AM   #7
Pete640
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Same as the otehr guys - I use Michelin UHD exclusively and have never had an issue with them on the long haul, dirt or otherwise. Put them in and forget about them. They last longer than the tyres!!!
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Old 01-09-2013, 03:19 AM   #8
genghis9021
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Uhd

I've used the UHD in a K60 for the Frankfurt to UB run which was everything from 140kph Autobahn to 15kph path, in lots of rain and tremendous heat in the Uzbek deserts (Kyzl Kum, etc).

Haven't changed that tire but will look for the "dust" allegedly from the inner tube when I do.

But I won't use a UHD again. REALLY made balancing the wheel difficult. That tube weighs more than my front tire (Karoo2) !

I run a Tubliss in the front and the lack of heat from ANY tube contributed to that tire lasting 50% longer than previous experience.
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Old 01-09-2013, 06:28 AM   #9
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I ran UHD for a while after initial purchase of the bike, having run HD and UHD on dirt bikes for years.

There were no problems with the tubes failing, other than one time with lower pressure I spun the wheel in the tire and ripped the stem out. This wasn't the fault of the tube. I probably put ten or fifteen thousand miles on those tubes through several tires, primarily street miles with many gravel roads and a few trails.

When it came time to replace the UHD tubes I considered how I had a number of puncture flats with them over the course of time. Avoiding punctures and pinches was the primary reason for going with UHD in the first place. It didn't seem to be working out for me.

I weighed the added cost of UHD against running a regular tube and RideOn sealant, and decided to go with the sealant instead of UHD. It seems like I've had fewer flats running a regular tube with sealant. Certainly no more flats than with UHD. The additional costs and issues with UHD, to me, provide marginal, if any, advantage over regular or HD tubes on our big bikes.

Other advantages to running regular tubes with sealant include:
  • Less gyroscopic mass in the wheels make cornering transitions easier.
  • No worries about overheating tube or tire.
  • Less heat may increase tire life.
  • Tire/wheel balance is less problematic.
  • Carrying spare tubes is less bulky.
  • Fewer flats and punctures are sealed quickly.
  • Lower replacement costs.
  • Greater availability of regular or HD tube at dealers.
For me the promise of higher reliability with UHD wasn't worth the extra expense and drawbacks associated with these tubes. I think that on a full on light weight dirt bike, like those used by enduro and hare scrambles racers, the UHD will offer some protection against pinch flats when running low pressures. On our gargantuan beasts it is probably better just to run a little higher tire pressure, lighter tubes, and sealant.

For me it is an ongoing study.

YMMV
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Old 01-09-2013, 06:41 AM   #10
Apple Jam
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Running the 908 rear with UHDs would get VERY hot on tarmac.
I've had it melt two patches on a multi-flat ride where I was forced to use patches.
I'd get 50-100 miles and patch would leak & peel off from the heat.
Tire was barely touchable
I just run Metzler or Bridgstone standard tubes after that loooong weekend.
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Old 01-09-2013, 09:18 AM   #11
MotoTex
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Quote:
Originally Posted by Apple Jam View Post
Running the 908 rear with UHDs would get VERY hot on tarmac.
I've had it melt two patches on a multi-flat ride where I was forced to use patches.
I'd get 50-100 miles and patch would leak & peel off from the heat.
Tire was barely touchable
I just run Metzler or Bridgstone standard tubes after that loooong weekend.
I had a similar problem with patches failing. For me it turned out it wasn't heat, but old patches. It seems they have a shelf life of about a year, after which they won't chemically bond properly.

After losing three consecutive patches I did some research and learned that fresh patches work best and become less effective over time. I bought new patches and cement and it worked the first time and has been holding for months now.

If your patches are over a year or two past manufacture, including time in distribution, sitting on the shelf at the store, and in your repair kit, it is probably time to replace them.

Could be that riding on low air pressure leaking from a poor bond led to the heat you noticed.

Something to consider.
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Old 01-09-2013, 03:54 PM   #12
Apple Jam
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Quote:
Originally Posted by MotoTex View Post
I had a similar problem with patches failing. For me it turned out it wasn't heat, but old patches. It seems they have a shelf life of about a year, after which they won't chemically bond properly.

After losing three consecutive patches I did some research and learned that fresh patches work best and become less effective over time. I bought new patches and cement and it worked the first time and has been holding for months now.

If your patches are over a year or two past manufacture, including time in distribution, sitting on the shelf at the store, and in your repair kit, it is probably time to replace them..
I never thought of that. Seems quite obvious when you say it....
Without question the patches were many years old (6-7?) , but the glue was fresh

Quote:
Originally Posted by MotoTex View Post
Could be that riding on low air pressure leaking from a poor bond led to the heat you noticed.

Something to consider.
I've bent too many F&R rims to run low pressure anymore.
Always 30+ lbs unless I have an EXTREMELY loose & nasty hill
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Old 01-09-2013, 08:14 AM   #13
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Tyre explody

I had a UHD tube explode into shreds on a (140kph+asphalt run in 35-40C temps, in a Heidenau K60 rear. I managed to stay on but have never used them since
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Old 01-09-2013, 10:03 AM   #14
FakeName OP
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Yeah, sorta what I thought. I've been exchanging email with the tire folks who've assured me that the 990/606/908 combination is no problem for the UHD tubes despite the earlier warnings.

But I do question the UHD paradigm. I've run them for years on the 525, but the big bike is different. The 606 run on the smaller bike carries a load of something like 275 lbs at fairly low sustained speeds. The same 606 on the big bike will carry closer to 375 at much higher sustained.

Further, the small bike will be lower psi- I usually run about 10-13. I think if I run that low pressure on the big bike (off road), I'll be buying a new front rim pretty quick.

Do I really gain a lot of flat protection with the thicker tubes?

Thanks for all the input so far, keep it moving!
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Old 01-09-2013, 12:25 PM   #15
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Ran the Michelin heavy duty tubes in my K60 tires in hot and cold conditions on pavement and above normal speeds never had a problem.
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