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Thread: 95 K75S ABS - Confirmation of Tire Size

  1. #1
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    95 K75S ABS - Confirmation of Tire Size

    The date codes on my tires are so old that Prince was still singing about 1999... so it's time for some new skins.

    I have been searching on several forums but have yet to find a definitive answer about my K75S as it seems the "S" model is often just a bit different. I have seen where people talk about their K75s (as in they own several), but before I go and spend several hundred dollars, I wanted to ask you friendly folks.

    I've had very good luck with a Metzeler Lasertech front tire and an 880 rear. On my last bike, a Honda Gl500 Silverwing, I had a pair last 18,000mi before cords were showing. I mostly ride solo for longer distances at reasonable speeds, so I want something that will last a long time.

    It seems the original sizes for my 3 spoke rims are:
    Front - 100/90 - 18
    Back - 130/90 - 17

    I'm looking at installing:
    Front - 100/90 - 18
    Back - 140/80 - 17 (since Metz. doesn't make an 880 in the correct size)

    Both will be bias ply since that's what the bike was designed for. Am I on the right track?

    ~Thom

  2. #2
    Administrator 20774's Avatar
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    Thom -

    Seems like going wider (130 to 140) and lower profile (90 to 80) might not be the best way to go, making for issues with the frame geometry and center stand changes. Here's some past threads that might help out, although they are a bit dated:

    http://www.bmwmoa.org/forum/showthre...tions-for-K75S

    http://www.bmwmoa.org/forum/showthre...Tires-for-K75s

    Just some things that I found...wait for the experts to weigh in!
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Registered User Paladinwest's Avatar
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    One of the K100RS's (about 1988 I think) came with 110/80-18 front and a 140/80-17 rear. I have used a 140/80-17 on the rear of my 86 K100RS and there was a spacer (BMW part) that went between the wheel and the hub to give a bit more space to the monolever. It can get pretty close for clearance depending on the tire (not all 140's are the same) and my experience was that after riding a few hundred miles the tire widened out a bit and got very close to the monolever. It did work and I used the tire for it's full life but I found that there was no performance advantage that I could see so I went back to the 130.
    2008 HP2 Sport 10,000, 2008 R1200GSA 97,000, 1990 R100GSPD 100,000, 1986 K100RS 152,000

  4. #4
    Benchwrenching PGlaves's Avatar
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    I have run at least a half dozen 880s in size 140/80-17 instead of 130/90-17 with no noticed ill effects whatsoever. This is on a K75S, K75 standard, and K75RTP. The K1100LT bikes had an identical rear wheel to the K75S and came with the 140/80-17 size stock.

    For reference: The drum brake K75C and K75T bikes had an 18 inch rear wheel
    All disk brake K75 standard, K75/3, K75RT and K75S bikes had a 17 inch rear wheel.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://www.bigbend.net/users/glaves

  5. #5
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    Thanks Paul - exactly what I was looking for!

    How do I make a donation to the P.G. Foundation?

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