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Thread: Tire Tread Depth ?

  1. #1
    RK Ryder
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    Tire Tread Depth ?

    I was planning on taking my '98 R1100RT for a 700 or 800 mile ride this week but am thinking of postponing the trip a few days until I pickup a set of tires.

    At present, I can see no tire wear marks. The Michelin PR4 & PR3 have a tire tread depth 3mm or 4/32nds. Am I being paranoid or is there still travel life left with these tires?
    Paul
    Retired and riding my RTs, the '87 K100 & the '98 R1100 !
    Niagara Riders & Knights of the Roundel #333

  2. #2
    Registered User m_stock10506's Avatar
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    Only you can decide, but IMHO you have plenty of tread life left there. If both of the tires have 4/32 tread depth now, then the rear is about half way and the front is barely worn.
    Michael Stock, Trinity, NC
    R1100RT, R100, R60/6

  3. #3
    Some folks get a lot more miles out of a set of tires than others. Riding style, tire inflation, road roughness, and other factors
    contribute to the life of a tire. Another factor is the degree of risk that the rider is willing to accept. Many folks are ok with
    having a tire wear to the "wear bars", which are typically placed with 1/32 of an inch (0.8mm) of tread left. The recommended
    minimum tread depth is 2/32 of an inch.

    Perhaps the most important job of the tire tread is to channel water away from the rubber / road interface in wet conditions.
    If the water is not adequately channeled away from the rubber / road interface the tire can hydroplane and the loss of
    friction can allow the bike to slide. I have had this happen during a very heavy rain storm. Fortunately, I did not
    crash. My tire had slightly more than 3/32 of tread in the center of the tire and a bit more at the edge. Never-the-
    less I decided to replace the tire.

    On my 2018 R1200RTW the tread depth is between 3/32 and 4/32 of an inch. I plan to ride this bike to the upcoming
    rally in a few weeks. I would rather have fresh tires before departing to the rally. I know that some folks plan to
    replace tires during the rally, but I like to know who is working on my bike. Thus, I will have both front and back
    tires replaced soon by my local BMW shop.

    There is some useful information regarding motorcycle tires at the links below -

    https://www.msf-usa.org/downloads/MI...ide_2012V1.pdf

    https://www.bikebandit.com/blog/stre...le-tires-guide

  4. #4
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by Paul_F View Post
    The Michelin PR4 & PR3 have a tire tread depth 3mm or 4/32nds.
    Are you checking at the center sipe.
    On the PR3 and PR4 I always measured at the center. I'm a touring rider so I wear the center out first.

    New PR3.JPG

    New PR4.JPG

    P1040476.JPG
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  5. #5
    JohnWC
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    Lee,
    If I'm not being too nosy, what are the weird contraptions that look like skis on the bikes behind the pile of tires. Is BMW making snowmobiles now and I missed it?

  6. #6
    Left Coast Rider
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    Quote Originally Posted by jconway607 View Post
    Lee,
    If I'm not being too nosy, what are the weird contraptions that look like skis on the bikes behind the pile of tires. Is BMW making snowmobiles now and I missed it?
    Looks like a jack to me.

  7. #7
    RK Ryder
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    Quote Originally Posted by Lee View Post
    Are you checking at the center sipe.
    On the PR3 and PR4 I always measured at the center. I'm a touring rider so I wear the center out first.

    New PR3.JPG

    New PR4.JPG

    P1040476.JPG
    Measurements were taken at centre.
    Paul
    Retired and riding my RTs, the '87 K100 & the '98 R1100 !
    Niagara Riders & Knights of the Roundel #333

  8. #8
    Quote Originally Posted by m_stock10506 View Post
    Only you can decide, but IMHO you have plenty of tread life left there. If both of the tires have 4/32 tread depth now, then the rear is about half way and the front is barely worn.
    On my new front tire, it measured 4/32, replacing a 2/32 worn tire. The rear is 7/32 new. I was surprised the front brand new was 4/32 and not more.
    The lion does not even bother to turn his head when he hears the small dog barking.

    https://www.youtube.com/user/azqkr

  9. #9
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by jconway607 View Post
    Lee,
    If I'm not being too nosy, what are the weird contraptions that look like skis on the bikes behind the pile of tires. Is BMW making snowmobiles now and I missed it?
    Front wheel stands.
    P1010736.JPG

    Tires2.JPG

    3-20-19 (1).jpg
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  10. #10
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by brownie0486 View Post
    On my new front tire, it measured 4/32, replacing a 2/32 worn tire. The rear is 7/32 new. I was surprised the front brand new was 4/32 and not more.
    It may be your gauge.
    The PR3s and PR4s we've had in the past had 6/32" depth for the front and 8/32" depth on the back when new.
    Most sport touring tires we have used have similar thread depths.
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  11. #11
    Left Coast Rider
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    Quote Originally Posted by Lee View Post
    Tell me you have matching M3's in the driveway.

  12. #12
    Quote Originally Posted by Lee View Post
    It may be your gauge.
    The PR3s and PR4s we've had in the past had 6/32" depth for the front and 8/32" depth on the back when new.
    Most sport touring tires we have used have similar thread depths.
    10-4, thanks
    The lion does not even bother to turn his head when he hears the small dog barking.

    https://www.youtube.com/user/azqkr

  13. #13
    Registered Schmoozer irish's Avatar
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    I never measured the tread depth on the many Pilot Road tires I have gone through, but have always gone by the tire wear indicators. I have found their wear to be very slow and predictable and have not had a situation where they were not at the wear bars and 800 miles later they were suddenly toast. So, I would go on that 700-800 mile ride and replace them when they are at the wear bars. Only exception might be if I was expecting to ride in heavy rain and they were very close to the wear bars, then I might replace them before the trip. My 2 cents.
    14 R1200GS, 02 R1150RT (retired)

  14. #14
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by BC1100S View Post
    Tell me you have matching M3's in the driveway.
    I wish
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  15. #15
    Registered User CABNFVR's Avatar
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    The Anakee IIIs on our GS have 3/32 to 4/32 at the center with only 3200 miles on them. We're headed to Lebanon which is only 300 ish miles away. 300 there, 300 on a planned Friday ride, 300 back. The Anakee rear should have started life at 9 or 10/32nd's so doing them math we'd get home on a completely worn out tire. I don't like the sound of that so we'll be changing them next week before heading to Lebanon.
    I'd rather get new tires too soon than run old tires too far.
    "Have BMW. Will Travel"

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