Results 1 to 10 of 10

Thread: Are these two problems related?

  1. #1
    Dale Rudolph
    Join Date
    May 2009
    Location
    Medford, Oregon
    Posts
    579

    Are these two problems related?

    1992 K75RT. I have noticed two problems in the last month and wonder if they
    are related. The first problem is tire wear on the front tire[ michelin macadam].
    It is wearing down much more on the left side as viewed from being on the bike.
    The second problem is the steering has developed a "Notch" very close to center.
    Whether the front tire is on or off the ground, when I move the steering from
    side to side, it clicks into what feels like a notch. The bike feels fine on the road,
    but is it possible that the forks are pointing 1 or 2 degrees off dead center because it settles into that notch? The very first thing that I noticed was that
    the instrument cluster was closer to the fairing on the right side than the left than
    it used to be. I suspect that the problem is in the steering head bearings. I don't
    want to replace the tire until the cause of the tire wear is fixed. Thanks for
    any ideas.

  2. #2
    Registered User kltsteve's Avatar
    Join Date
    Jan 2006
    Location
    Troy MI, Vero Beach FL
    Posts
    34
    My opinion is that the 2 issues are not related.
    Issue 1: Every BMW which I have ever owned has exhibited the problem with the front tire wearing on the left side. The dealer gave me some bs about the crown on the road, and how it will cause the tire to wear more on the crowned side. You will no doubt hear that dubious answer on this forum. To which I answer: why does not the rear tire, which follows so closely behind the front, wear the same way? No answer. Also, my buddy and I both equipped our bikes with new tires, his a Honda Valkyrie, me a R1150RT, we ride from Chicago to Prince George, BC and back, on the same roads, alternating between left track and right. After 10,000 combined miles, 1 tire, the R1150RT front is worn on the left. The other 3 are normal...why? I don't know. Just don't accept the crown answer.
    Issue 2: I think you are right, you have a head bearing with a flat spot.
    Cheers!
    Life is what happens to you while you're making other plans
    John Lennon - Double Fantasy
    Today: 00 K1200LTC, 01 330Cic, 02 HD FLHT, 99 Valkyrie
    Yesterday: 03 K1200GT 99 K1200LT 03 R1150RT 00 R1100RS 85 K100 74 R90/6 73 Kawi H1

  3. #3
    Dale Rudolph
    Join Date
    May 2009
    Location
    Medford, Oregon
    Posts
    579
    Thanks for your reply. Both tires were installed at the same time by the last
    owner . There are now approx. 5,000 miles on them, the rear shows no
    abnormal wear. I did do a search for other threads about tire wear and there
    are plenty of opinions, everything from the crown on the road, to the bike not
    being loaded evenly, to "It's normal because BMW's are heavier on one
    than the other with the drive shaft being only on one side.
    I am not sure if this bike has a steering damper. The clymers manual says that
    it located within the steering head if it has one. Some K75's had them , some didn't. According to Clymers, the damper "Provides friction to damp any steering
    and fork action over 1 degree". If this bike does have the steering damper, could
    this be the "Notch" that I feel ?. It would be nice if I only thing I need is a new
    front tire.

  4. #4
    Registered User robsara's Avatar
    Join Date
    Dec 2009
    Location
    West Michigan
    Posts
    157
    Quote Originally Posted by DRUDOLPH148006 View Post
    Thanks for your reply. Both tires were installed at the same time by the last
    owner . There are now approx. 5,000 miles on them, the rear shows no
    abnormal wear. I did do a search for other threads about tire wear and there
    are plenty of opinions, everything from the crown on the road, to the bike not
    being loaded evenly, to "It's normal because BMW's are heavier on one
    than the other with the drive shaft being only on one side.
    I am not sure if this bike has a steering damper. The clymers manual says that
    it located within the steering head if it has one. Some K75's had them , some didn't. According to Clymers, the damper "Provides friction to damp any steering
    and fork action over 1 degree". If this bike does have the steering damper, could
    this be the "Notch" that I feel ?. It would be nice if I only thing I need is a new
    front tire.
    It is my understanding that the bearing and dampener are separate items. Your bearings do sound worn. You will need to replace those. To find out if you have a dampening system, I know one of them on the K75x and maybe some others will have two allen bolts on the side of the steering column. You can't miss them. they look like they are in the middle of nowhere and when you take them out, they will be pointed on the end.

    Good luck. And take lots of video whilst you change your bearings. It's on my list for next winter.

    FWIW
    Rob R
    1994 K75 My first bike.

  5. #5
    Dale Rudolph
    Join Date
    May 2009
    Location
    Medford, Oregon
    Posts
    579
    I did look for the bolts, being the RT model, it's difficult to see what's between
    the gas tank and the fairing. The bolts that I can see go to the braces that
    hold the fairing in place. If you have the damper on yours, then I assume you
    would have mentioned if you also felt the "Notch'. Thanks for the reply.

  6. #6
    Dale Rudolph
    Join Date
    May 2009
    Location
    Medford, Oregon
    Posts
    579
    I don't think this has anything to do with the "Notch" in the steering or the instrument
    panel no longer being centered, but I didn't notice these things until after
    I pulled the forks out to replace the fork seals. The forks were removed and
    replaced one at a time.

  7. #7
    Dale Rudolph
    Join Date
    May 2009
    Location
    Medford, Oregon
    Posts
    579
    As an update. I put the bike out in the driveway in the sun and raised the bike
    so the front tire could be rotated to get a better look at it. The wear on the left side
    seems to be mainly in the area about 10 inches each side of the valve stem.
    There are no weights on it as there are on the back wheel. I checked the tire
    date and it is 2001. I was able to contact the former owner and it seems that
    there are more miles than originally thought on the tires.
    My best guess is that it has been out of ballance for awhile and it has actually
    given good mileage for the years it has been on the bike. Will look into getting
    a new set of tires.
    The only problem then is the steering head bearings.
    Thank you for your ideas.
    I think I will spend an hour each month and really look the bike over. The loss
    of the wheel weight[s] and the tire date are things I should have noticed long
    ago.

  8. #8
    BMW uber alles! Zagando's Avatar
    Join Date
    Apr 2007
    Location
    Rockport, TX
    Posts
    1,085
    Suggestion; when you put new tires on (Bridgestones BT45s are great on my K); try balancing with Dyna Beads---better than using weights, IMO.

    Good to know you narrowed your problem down to the steering head bearings; good luck with that task.
    ---Jeff

    ex: K75S Berlina R100GS/PD , K100RS , R75/5 , R60/2

  9. #9
    Dum vivimus vivamus ted's Avatar
    Join Date
    Mar 2003
    Posts
    2,586
    I checked the tire date and it is 2001.
    Tires that old can exhibit all kinds of funky behavior and wear, they are notorious for going from merely worn to showing cord in as little as between gas fillups (don't ask me how I know...)


    You might want to re-shoe the bike when replacing the steering head bearing
    Ted
    "A good stick is a good reason"
    1994 K75RT
    Moto Pages

  10. #10
    Dale Rudolph
    Join Date
    May 2009
    Location
    Medford, Oregon
    Posts
    579
    Ted; The previous owner did not own the bike in 2001, but did have them
    installed, so it must be a case of these tires sitting in a warehouse for a few
    years. This is a question I would bring up if ordering tires online, that you will
    not accept tires with a manufacture date over one year old. Your right about
    tires looking good one month and showing much more wear the next, the front
    tire started showing wear right at the same time I noticed the notch in the steering, and assumed that there must be a relationship between the two, but
    it just happened that two things happened around the same time.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •