Rear tire - low pressure issue

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Nikt

Nikt

Joined
Jul 16, 2012
Messages
226
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not your biz
Hello Everybody,

just a question on the pressure of the rear tire. I usually ride at 36psi.

On first service I told the dealer to check the rear tire because I've already had low pressure issues and they replaced the valve.

Today I picked up the bike after 2 weeks and when I checked the pressure it was down to 25psi. I brought it up to 36 again and then I rechecked at home and it was already down to 34. I checked the tire for nails and the like, but it seems perfect apart from standard tear and wear

Any similar stories/explanations/suggestions?

Thank you;)
 
Yes, same problem. Getting it looked at tomorrow and will let you know what they find.
 
My front tyre goes down, but not as bad as yours. I didn't take it to the dealer as I assumed tyres aren't covered under warranty. I just check and top it up every week or two. The rear almost never needs extra air.
 
leaky valve core, or valve leaking at the base.
tire not fully seated on the wheel. (perhaps wheel is not perfectly round, or foreign object in the bead area.)
 
zvez said:
leaky valve core, or valve leaking at the base.
tire not fully seated on the wheel. (perhaps wheel is not perfectly round, or foreign object in the bead area.)
Click to expand...

I hope it's not a rim issue...thx
 
-- a pound or 2 over a weeks time could be considered normal, more than that and it is probably a slow leak......the dealer will pump up the psi and dunk/submerge the wheel to find the source.......I've seen it where it was so small they were giving up, couldn't find it, then up popped a knats fart....it was a tiny pc of safety wire that had worked its way thru
 
It was a "corroded" valve stem so they say. They replaced it and didn't charge for the service which I thought was great. So, I'll keep measuring, but I hope thats all it was.
 
as mentioned in another thread, the valve stems are alum and the cores are steel. It's really tough not to overtorque and strip the threads on the inside of the valve stem. I keep several extras on hand as these are smaller diameter than most (all?) japanese bike valve stems, I think 8.5mm vs. 11mm?
 
bronch said:
It was a "corroded" valve stem so they say. They replaced it and didn't charge for the service which I thought was great. So, I'll keep measuring, but I hope thats all it was.
Click to expand...

Dealer just called me and told me that they changed the whole valve system free of charge. No comments on what the issue was. I will pick up my beauty/beast tomorrow and ask for more details.

BTW asked you a question on DP levers in the other tread

thx
 
that was the appropriate fix, you can't do anything with those valves as they're alum and once you start trying to tighten the core it'll just make things worse.

Nikt said:
Dealer just called me and told me that they changed the whole valve system free of charge. No comments on what the issue was. I will pick up my beauty/beast tomorrow and ask for more details.

BTW asked you a question on DP levers in the other tread

thx
Click to expand...
 
Get some Soapy Water and put it on the back tire and see if you can find where the leak is coming from. Should start to bubble if you find the correct spot.
 
bronch said:
That sucks! Did they replace the core or the whole valve stem unit? If they did, sounds like something in the tire.
Click to expand...

They told me they did replace core and stem.

Before going in I put the bike on the stand and checked the whole tire but couldn't find any issues. I will bring the bike in again this saturday and leave it with the dealer for 1 week...

if the problem remains I will write to Ducati....3 times out.:mad:
 
future1199 said:
Get some Soapy Water and put it on the back tire and see if you can find where the leak is coming from. Should start to bubble if you find the correct spot.
Click to expand...


This could be the real issue if you dont have a valve problem. You might have gotten a small puncture the size of a stapler wire...that stapler wire could have been flung-off during your highspeed runs...thus now causing a slow air leak that is not visible to the human eye...

-Over inflate your rear tire to 45psi
-put your bike on a rear stand
-Put soapy water (as suggested by FUTURE1199) and rub soapy water on your tire, slowly spin and check your tire inch by inch...check for bubbles.

I had the same problem and I found the solution by doing it this way. Had the tire patched up...no problem eversince.

Hope that helps.

Miguel
 
mig1199 said:
This could be the real issue if you dont have a valve problem. You might have gotten a small puncture the size of a stapler wire...that stapler wire could have been flung-off during your highspeed runs...thus now causing a slow air leak that is not visible to the human eye...

-Over inflate your rear tire to 45psi
-put your bike on a rear stand
-Put soapy water (as suggested by FUTURE1199) and rub soapy water on your tire, slowly spin and check your tire inch by inch...check for bubbles.

I had the same problem and I found the solution by doing it this way. Had the tire patched up...no problem eversince.

Hope that helps.

Miguel
Click to expand...

Will try this one as well...45psi??? Isn't it too much?
 

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