Crown

Board: Porsche - 911 - 997 Language: English Region: Worldwide Share/Save/Bookmark Close

Forum - Thread


    HELP: New Valve Stems Needed When Installing New Tires??

    Quick question please. I am changing my rear tires from Conti to Michelin Pilot Sport. Are the valve stems (I hope this is the right term?) supposed to be changed when you change tires? Thanks in advance.

    Re: HELP: New Valve Stems Needed When Installing New Tires??

    Supposed to? Yeah, it's kind of an unwritten rule kinda thing. But it's not an absolute thing, like changing the filter with your oil. It's more a preventative maintenance thing where it can't hurt to replace a .99 cent valve stem while you've got the tire dismounted. But keep in mind, that most tires get changed at 30K-50K miles.

    So to answer your question... do it now, or just do it next time, it won't matter. You won't be springing a leak from a dry-rotted valve stem any time soon...

    Re: HELP: New Valve Stems Needed When Installing New Tires??

    Your tires will wear-out long before the stems....

    Re: HELP: New Valve Stems Needed When Installing New Tires??

    Quote:
    cannga said:
    Are the valve stems (I hope this is the right term?) supposed to be changed when you change tires?


    Metal valve stems from Porsche can be reused (upto 3 times) but the rubber versions MUST be replaced. If you are running around with hollow-spoke wheels use only Porsche valve stems, they are a few mm shorter than regular valve stems (they cost the same).

    Re: HELP: New Valve Stems Needed When Installing New Tires??

    Quote:
    jandreas said:
    Quote:
    cannga said:
    Are the valve stems (I hope this is the right term?) supposed to be changed when you change tires?


    Metal valve stems from Porsche can be reused (upto 3 times) but the rubber versions MUST be replaced. If you are running around with hollow-spoke wheels use only Porsche valve stems, they are a few mm shorter than regular valve stems (they cost the same).



    MUST be replaced?? Why? Do they turn into pumpkins at midnight? It's just a valve stem, it lasts as long as it lasts, which on a 997, given the tires in question, should be at least a few sets of tires. But then again, they're so cheap, why not pop new ones in while you've got things broken down. But there's no "must" about any of it.

    Re: HELP: New Valve Stems Needed When Installing New Tires??

    Quote:
    69bossnine said:
    MUST be replaced?? Why? Do they turn into pumpkins at midnight? It's just a valve stem, it lasts as long as it lasts, which on a 997, given the tires in question, should be at least a few sets of tires.


    All fasteners (bolts, nuts, screw-in steel valve stems, etc.) can undergo a finite number of reuse cycles before they no longer function as designed. Porsche also recommends not reusing the steel valve stems if they are more than three years old. I don't know the exact reasoning behind the age requirements but one possibility could be corrosion worries (or maybe o-ring hardening)? The warning that rubber valve stems "MUST" not be reused comes from Porsche and every tire and wheel manufacturer and valve stem removal tool maker. And might have something to do with the rubber not resealing properly (internal nut deformation? bent stem?)

     
    Edit

    Forum

    Board Subject Last post Rating Views Replies
    Porsche Sticky SUN'S LAST RUN TO WILSON, WY - 991 C2S CAB LIFE, END OF AN ERA (Part II) 3/28/24 3:21 AM
    watt
    690565 1780
    Porsche Sticky Welcome to Rennteam: Cars and Coffee... (photos) 2/19/24 11:51 PM
    Wonderbar
    409813 564
    Porsche Sticky OFFICIAL: Cayman GT4 RS (2021) 5/12/23 12:11 PM
    W8MM
    256050 288
    Porsche Sticky OFFICIAL: Porsche 911 (992) GT3 RS - 2022 3/12/24 8:28 AM
    DJM48
    235289 323
    Porsche Sticky The new Macan: the first all-electric SUV from Porsche 1/30/24 9:18 AM
    RCA
    65670 45
    Porsche Sticky OFFICIAL: Taycan 2024 Facelift 3/15/24 1:23 PM
    CGX car nut
    4657 50
    Porsche The moment I've been waiting for... 2/1/24 7:01 PM
    Pilot
     
     
     
     
     
    858486 1364
    Porsche 992 GT3 7/23/23 7:01 PM
    Grant
    774763 3868
    Porsche OFFICIAL: New Porsche 911 Turbo S (2020) 4/6/23 7:43 AM
    crayphile
    448338 1276
    Porsche Welcome to the new Taycan Forum! 2/10/24 4:43 PM
    nberry
    379384 1526
    Porsche GT4RS 2/22/24 5:16 AM
    tso
    366001 1424
    Porsche Donor vehicle for Singer Vehicle Design 7/3/23 12:30 PM
    Porker
    361129 797
    Others Tesla 2 the new thread 12/13/23 2:48 PM
    CGX car nut
    355094 2401
    Lambo Aventador and SV 3/30/23 1:59 PM
    CGX car nut
    279621 724
    Ferrari Ferrari 812 Superfast 4/21/23 8:09 AM
    the-missile
    276048 550
    Porsche Red Nipples 991.2 GT3 Touring on tour 3/14/24 8:55 PM
    blueflame
    272822 658
    Porsche Collected my 997 GTS today 10/19/23 7:06 PM
    CGX car nut
     
     
     
     
     
    248342 812
    Lambo Huracán EVO STO 7/30/23 6:59 PM
    mcdelaug
    225310 346
    Others Corvette C8 10/16/23 3:24 PM
    Enmanuel
    218127 488
    Lotus Lotus Emira 6/25/23 2:53 PM
    Enmanuel
    197084 101
    Others Gordon Murray - T.50 11/22/23 10:27 AM
    mcdelaug
    155494 387
    Porsche Back to basics - 996 GT3 RS 6/11/23 5:13 PM
    CGX car nut
    127049 144
    Ferrari [2022] Ferrari Purosangue (SUV) 4/15/23 5:20 AM
    watt
    120643 141
    BMW M 2024 BMW M3 CS Official Now 12/29/23 9:04 AM
    RCA
    106140 303
    Motor Sp. 2023 Formula One 12/19/23 5:38 AM
    WhoopsyM
    102625 685
    Others Valkyrie final design? 4/28/23 2:45 AM
    Rossi
    97688 219
    Porsche 2022 992 Safari Model 3/7/24 4:22 PM
    WhoopsyM
    81071 239
    AMG Mercedes-Benz W124 500E aka Porsche typ 2758 2/23/24 10:03 PM
    blueflame
    74354 297
    Porsche 992 GT3 RS 3/3/24 7:22 PM
    WhoopsyM
    52169 314
    Motor Sp. Porsche 963 3/16/24 9:27 PM
    WhoopsyM
    23108 237
    132 items found, displaying 1 to 30.