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Author Topic: Tire Size  (Read 7347 times)

Offline gag1025

  • Ride It Like You Stole It
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Tire Size
« on: May 26, 2016, 09:14:14 PM »
What are the widest 17" and 18" tires I can mount on my 1992 K75 RT? I now have 100/90/18 (Front) and 130/90/17 (Rear).
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  • Gibsonville, NC
  • 1992 BMW K 75 RT ABS but soon to be a Naked K75

Offline johnny

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Re: Tire Size
« Reply #1 on: May 26, 2016, 09:18:18 PM »
front width will be determined by the tior hitting the fender bolts...

rear width will be determined by the tior hitting the swing arm...

other than that... figger out your wheel widths then start looking at tiors that fits those wheels that dont rub the forks or swingarm...

j o
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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline TimTyler

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Re: Tire Size
« Reply #2 on: May 26, 2016, 11:18:06 PM »
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Offline TrueAce

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Re: Tire Size
« Reply #3 on: May 26, 2016, 11:20:24 PM »
Should be good at 110 front and 140 rear.
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Offline gag1025

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Re: Tire Size
« Reply #4 on: May 27, 2016, 09:21:15 AM »
Thanks TrueAce for the information I needed.
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  • Gibsonville, NC
  • 1992 BMW K 75 RT ABS but soon to be a Naked K75

Offline K75RT Keith

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Re: Tire Size
« Reply #5 on: May 31, 2016, 04:47:08 PM »
+1 on the 110 front.  Rear more depends on which rear rim you have  I've got a 140 on the Y spoke and it fits fine.  The 3 spoke is 3" and you might be able to sneak a 150 in there. 

A 4.5 x 18" from a K1100RS or R1100 may fit the monolever and would allow you to run a 150 or 160.  I'd' find someone with a 4.5 with a tire that would let you fit it on your bike before going too far.   
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You can't help someone who doesn't want to hear the answer.

1990 K75RT

Offline TimTyler

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Re: Tire Size
« Reply #6 on: May 31, 2016, 06:06:12 PM »
I've had 130's on the Y-spoke rear and had to shim the wheel out a few millimeters to keep it from rubbing the swing arm.

How do you manage with 140's?
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Offline jakgieger

  • itinerant farmer
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Re: Tire Size
« Reply #7 on: May 31, 2016, 08:09:04 PM »
From 1989 owners manual...

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  • Kansas USA
  • 1989 K100rs se
"What we've got here is failure, to communicate.  Some men, you just cain't reach.  So you get what we had here last week.  Which is the way he wants it...Well, he gets it.  I don't like it any more than you men do."
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