1992 GSPD Tire Leak

Discussion in 'Airheads' started by Grayghost60, May 19, 2017.

  1. Grayghost60

    Grayghost60 Wheres the Tims?

    Joined:
    Sep 6, 2015
    Oddometer:
    186
    Location:
    Toronto Ontario
    Hi Everyone,

    Having a problem with my GS specifically a slow leak on the front I cannot solve. I had a new Metzler Sahara 3 put on last year and had the valve stem replaced as well. Tire starts to lose air to about half the desired pressure in about a week.

    Yesterday, I started with a soap and water test on the bead and valve core - nothing. I pulled the tire off, carefully looked for any sign of puncture - none. I noticed there was a little corrosion on the inside rim shoulder, so I used scotch bright, followed by 600 Grit paper and sanded until it's very smooth. Everything looks fine.

    Remounted the tire on the rim, filled with air until I had the POP of the bead seating. Adjusted to the proper tire pressure.

    This morning I had about half the air pressure!

    I'm scratching my head at this point. The air can only escape from;
    1. Puncture
    2. Bead no seating fully?
    3. Valve stem base or valve core valve leaking.

    The only thing I can think of at this point is to pull the tire off again, and replace the valve stem with a new one.

    Has anyone used a bead sealant (there is such a product) to solve such an issue? Good idea or bad idea?

    Any comments welcome and appreciated.
    #1
  2. Big Bamboo

    Big Bamboo Aircooled & Sunbaked

    Joined:
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    A friend here on the island has had good luck with Slime products in his Snowflake wheel with a similar issue. :zilla My local Honda shop uses a bead sealant on all tubeless applications.
    #2
  3. tennessee thumper

    tennessee thumper Long timer

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    There are a few threads on this somewhere.

    In short the Akront rim does not seal too well with certain tires. I went to a tube and forgot about it.
    #3
    Bigger Al likes this.
  4. Dreossi

    Dreossi Been here awhile

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    Apr 21, 2013
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    London, Ontario, Canada
    +1 for tubes
    #4
  5. Beemerboff

    Beemerboff Long timer

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    Tubes are the only way I have found to make these dumb rims hold air ------------.
    #5
    stucknarut likes this.
  6. airheadPete

    airheadPete Wherever they send me.

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    Unless you're certain it's not the cause, you could replace the valve core.
    That'll take care of one suspect, and it's the easiest place to start.
    #6
  7. stucknarut

    stucknarut Uh oh...

    Joined:
    Dec 28, 2011
    Oddometer:
    237
    Location:
    NC
    My Akront rims do the same thing. Front not bad, rear about like that. Tubes or check and fill every time
    #7
  8. Wirespokes

    Wirespokes Beemerholics Anonymous

    Joined:
    Jul 26, 2002
    Oddometer:
    9,240
    Location:
    Jackson's Bottom Oregon
    I've had a couple GSs, three PDs and an R100R - none of them leaked.

    I did buy a used wheel that had a bunch of gravel wedged between the tire and rim. Once handled, it held just fine.
    #8
    Uke likes this.
  9. fayeslane

    fayeslane Rankest of amateurs

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    Oddometer:
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    Location:
    Albury, NSW
    Have had problems with harder tyres like Mitas & Heidenau but not with Metzelers, Pirellis etc. A tube is the easy answer if a valve change doesn't help.
    #9
  10. rheritage

    rheritage Been here awhile

    Joined:
    Dec 7, 2010
    Oddometer:
    416
    Location:
    Savannah, GA
    On my 93 PD I installed Sahara 3's, major PIA to even get them to seat. Once on I could not get either to hold air correctly, after trying many different fixes I went to tubes.

    I'm about to install a set of Shinko 804/805's, no tubes, see what happens.
    #10
  11. StmbtDave

    StmbtDave AKA Invisible Dave

    Joined:
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    My rims were leaking and had a major buildup of crap from prior tire changes. I cleaned the sealing surfaces but the tires still wouldn't seal so I purchased a can of professional tire sealing solution at the local auto parts store. Problem solved.
    #11
  12. globalt38

    globalt38 "A Fist Full of Throttle"

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    Does using a sealant leave a residue and, if so, is it hard to get off for next tire change?
    #12
  13. StmbtDave

    StmbtDave AKA Invisible Dave

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    Yes, it does leave a residue. As I recall, it's consistency was like a watered down rubber cement. I applied it at my last tire change so I won't see what sort of mess it left behind until my next change. I'm assuming that when I cleaned the sealing surface on the rim, I cleaned it too good and the tire couldn't seal to the slick surface. It could be that the sealant won't have to be removed and re-applied and its rubber like film will seal the next tire also.
    #13
    globalt38 likes this.
  14. Mobiker

    Mobiker Long timer

    Joined:
    Apr 22, 2003
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    Missouri
    I had a Metzeler front that leaked. Couldn't find the leak with a spray bottle. Put the wheel in the bathtub (easier if you're not married). It had a bunch of very tiny leaks all around the bead. A bunch. Demounted the tire and cleaned the rim. No improvement. Never had this problem with previous tires including Metzelers. Lived with it for a while then replaced the tire. No more problem. I've had 3 front tires since and still no problem. The suspect tire looked fine, but there was obviously some flaw. So....if you haven't had this problem before, it may just be this particular tire. Stick the wheel in a tub of water and see what's what.
    #14
    globalt38 likes this.
  15. rwiles

    rwiles Been here awhile

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    Jan 5, 2006
    Oddometer:
    162
    Shinko 800s dont leak
    #15
  16. rwiles

    rwiles Been here awhile

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    A GSPD can be ridden with a flat front tah’r... ask me how I know. The best cure for Akront 21” rim-leak is to clean the mating surfaces and use a bead-sealant. Sparingly.
    #16
    jackd likes this.
  17. WooPig

    WooPig Gravel Traveler

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    I recently had a new Sahara that kept leaking down. I finally gave up and Slimed it and later found the Slime oozing through a dozen tiny leaks around the center of the tire!
    #17
  18. thetubespoke

    thetubespoke Been here awhile

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    Fort Collins, Colorado
    That's one of the things I hate about these wheels. They seem to leak easily and you end up needing a tube. Although many have no leaks as well but it's not an uncommon problem.

    I would try RideOn instead of Slime. Slightly less gross, less messy, and is pretty effective in some applications. Not a bad thing to have in there anyway.
    #18