2019 Rear tire flat....

Woe unto you that bought the first model year of a major remake, perhaps this section can help address any 2014 and later model Ural "imperfections". Here's a special section for folks with the latest rigs to discuss 2014 and later model-related topics such fuel injection, 3-wheel disc brakes, hydraulic steering dampers, spin-on oil filters and other anomalies that don't belong on true Russsian motorcycle ;-P We've gone from using big hammers and greasy wrenches to needing computers and Ouija boards in order to fix our rigs.
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Please keep this section specific to issues pertaining to 2014 and later models such as fuel injection, sidecar and rear disc brakes and so forth. Ask general or non-2014 and later specific questions in the main Hammerin' & Wrenchin' section.
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tas7107
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2019 Rear tire flat....

Post by tas7107 » Wed May 08, 2019 7:49 pm

Hi All,

Was out for the first real long ride on the '19 GU. Was about 170 miles form home and the rear tire rapidly deflates at 60mph. Oh great I think, must have hit a piece of metal or something. Not uncommon in the spring in Oregon with bits of snow chain lying around. Anyway i switch out the tire and ride on and complete the 350 mile loop. Over two days btw. My azz is not that tough yet..
Imagine my surprise when I found this..... now I've ripped off valve stems one or twice before but never at a steady highway speed... Certainly never on a tire/tube that only had 500 miles on it. Me thinks the tire was slipping on the rim from new for some reason...

Or, When I changed the wheel on the side of the road, I thought "man these brake pads seem thin to be new. Well maybe that is just how they are." To thicken the plot, on my way home, I hit the rear brake at about mile 340 and got the satisfying sound of metal pad backing on disc.

So my question is this: If my rear brake pads were dragging this entire time would enough heat transfer from disc to hub to spokes to rim to cause the valve stem vulcanization to fail?

Seems like quite the conspiracy.. I my rear disc doesnt look like it has heated in a forge....
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chaos2
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Re: 2019 Rear tire flat....

Post by chaos2 » Wed May 08, 2019 7:56 pm

I don't think you'd get much heat transfer through the spokes. Check the tube for punctures, usually it goes flat and then the stem tears out as the tube flops around.
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windmill
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Re: 2019 Rear tire flat....

Post by windmill » Wed May 08, 2019 8:06 pm

chaos2 wrote:
Wed May 08, 2019 7:56 pm
I don't think you'd get much heat transfer through the spokes. Check the tube for punctures, usually it goes flat and then the stem tears out as the tube flops around.
Agree, the stem tearing out was almost certainly collateral damage from getting a flat.

The OE pads don't last very long, but that's too quick. Because of where the parking brake lever is situated, and there being a idiot light, I seriously doubt you were riding with it on unnoticed. Perhaps your foot has been putting some pressure on the brake pedal which could cause excessive wear without being noticed, but wouldn't generate enough heat to have the slightest effect on the tire.
Barry

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Lokiboy
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Re: 2019 Rear tire flat....

Post by Lokiboy » Wed May 08, 2019 8:18 pm

Keep the nut on the stem about 1/4” from the rim. This allows the tube to flex and will not tear the stem from the tube.
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tas7107
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Re: 2019 Rear tire flat....

Post by tas7107 » Wed May 08, 2019 8:42 pm

I wouldn't think that kinda heat would transfer through the spokes either. Besides I'd think it would cook off the oil in the rear drive. Seems to be fine. Didn't find any other holes in the tube. For sure wasn't a slow leak. Had about enough time to think " Is the rear end dropping?" then whoosh... As far the brake pads go, I think the caliper wasn't releasing. Never drove it with the parking brake on... Going to take it back to dealer for a 500 mile first service anyway. Going to have them check out the rear brake. Keep ya posted.
Terry
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tas7107
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Re: 2019 Rear tire flat....

Post by tas7107 » Wed May 08, 2019 8:43 pm

Lokiboy wrote:
Wed May 08, 2019 8:18 pm
Keep the nut on the stem about 1/4” from the rim. This allows the tube to flex and will not tear the stem from the tube.
Yeah I usually do that when I replace a tube. Didnt think to loosen them on the new bike.
Terry
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cateyetech
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Re: 2019 Rear tire flat....

Post by cateyetech » Wed May 08, 2019 9:36 pm

Hey tas

We had one of the 308's that was too loose on the rim
ate 2 tubes before I marked the tire and realized what was happening :(
your a little quicker than me :lol:
so I would mark the tire just to be sure :)

To us it happened on the pusher after a tire change
the 1st time/tube was coming up the hill to the house, throttled up and whoosh, flat in the driveway
2nd time/next day with a new tube, on the way home from work hit 3rd gear and the same, flat under overpass
3rd time/3 days later while riding 3 up on a 200 mile trip, running 50 heading up a hill,
this time POP! and it got funky :shock:
popped tube again, tire off/outside one side of the rim and 3 broke spokes :shock: :shock: :shock:

Just our experience, may not be your issue :?:
be safe & good luck

:foilhead:
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Trumpetwasher
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Re: 2019 Rear tire flat....

Post by Trumpetwasher » Wed May 08, 2019 9:46 pm

You're either pushing the brake pedal down or resting your foot on the linkage. Ride on your toes or install the Santamaria foot rest.
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Re: 2019 Rear tire flat....

Post by SidecarDan » Wed May 08, 2019 10:06 pm

Move your right foot around while riding and watch the sidecar brake light. Does your normal riding position keep the light on?
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Re: 2019 Rear tire flat....

Post by Black_Magic » Thu May 09, 2019 10:17 am

Trumpetwasher wrote:
Wed May 08, 2019 9:46 pm
Ride on your toes or install the Santamaria foot rest.
Is that spelt correctly?
I did an image search for the footrest and nothing came up that appeared to fit the bill.
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Re: 2019 Rear tire flat....

Post by ArgonV » Thu May 09, 2019 11:55 am

Another pro-tip: Check your air-pressure before you ride. In my experience I lose 10 psi a week. An underinflated tire, will cause the tube to slip.
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stagewex
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Re: 2019 Rear tire flat....

Post by stagewex » Thu May 09, 2019 1:46 pm

That has happened to me once while riding. I had lowered tire pressure after a weekend riding off-road. I trailered home cleaned the bike and put it away. I never re-aired/fogot to fill the tire and along with the natural order of tossing a tiny bit of air over time... the rim slipped and the valve came completely of the tube. Appered to be a defect but the problem after thinking about it was... me.
It was hairy at 20 mph with the bike steering itself into oncoming traffic. Can't imagine at a faster speed. Se yeah... check that air-pressure more than every once and awhile.
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Re: 2019 Rear tire flat....

Post by ArgonV » Thu May 09, 2019 3:04 pm

Yep yep, I check once a week if I ride just about every day. If I haven't ridden in a while, I check before I hop on and go.
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RC20
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Re: 2019 Rear tire flat....

Post by RC20 » Thu May 09, 2019 7:31 pm

If you were dragging the brake to any degree the smell would be awful.

Whole assemble;y would be screaming hot.
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Re: 2019 Rear tire flat....

Post by Pterodactyl » Thu May 09, 2019 8:30 pm

ArgonV wrote:
Thu May 09, 2019 11:55 am
Another pro-tip: Check your air-pressure before you ride. In my experience I lose 10 psi a week. An underinflated tire, will cause the tube to slip.
Not my experience. Maybe 1-3 PSI a week.
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