Author Topic: Will this rack from a k1100lt fit a 92 K75rt?  (Read 750 times)

Offline Lbxpdx

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Will this rack from a k1100lt fit a 92 K75rt?
« on: August 20, 2023, 06:29:28 PM »
I picked up a group of parts from a k1100lt as I could use some of them for my K75rt.  Will this rear rack fit?
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  • 1992 K75Rt 1972 R60/5 1977 R100S

Offline The Mighty Gryphon

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Re: Will this rack from a k1100lt fit a 92 K75rt?
« Reply #1 on: August 20, 2023, 07:31:20 PM »
Because the frames and tail sections are the same, I would think it will work.
  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Laitch

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Re: Will this rack from a k1100lt fit a 92 K75rt?
« Reply #2 on: August 20, 2023, 08:51:48 PM »
Like TMG indicates, it should work. All the classic Brick side case racks are the same and the top case rack mounts to them. What you'll need is the screws, washers and what-all that secures them. Left rack is at the arrow and you'll need the right one , too if you don't have them already, plus their fasteners. All fasteners and hardware to mount  the top case rack are circled. The sizes and styles of the screws can be found at this MaxBMW link, Diagram #46.
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Offline frankenduck

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Re: Will this rack from a k1100lt fit a 92 K75rt?
« Reply #3 on: August 21, 2023, 02:40:59 AM »
The tail cow and "wedge" are the same but the frames are different. The mounting for the side cases use the same side Z racks too but the tops where they mount are wider apart on 4V Ks because the bottoms of the racks at the peg plates are pushed out to accommodate the backs of the peg plates being wider for the hump where the paralever final drive shaft housing pivots in the middle.

On a K75/K100 the Z rack mounting point is below the middle of the frame. On a 4V K bike those same mounting points are out to the side of the frame.

K75/K100 frame:


4V K bike frame:


This is why there are two different Reynolds Racks for 2v and 4V K bikes.

However, it is quite possible to retrofit a K1100LT tail rack to a K75 or K100. BMW even offered a kit do do so:
https://www.realoem.com/bmw/enUS/showparts?id=0573-USA---K569-BMW-K%2075%20RT%20(0565,0573)&diagId=46_0319

You'll just need to experiment some to figure out the correct bolt length and spacer width.







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Offline Laitch

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Re: Will this rack from a k1100lt fit a 92 K75rt?
« Reply #4 on: August 21, 2023, 08:47:06 AM »
Nice bit of arcane information, frankenduck. I had trouble taking my eyes off the zip-tied license plate to start reading it though.  :laughing4-giggles:
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline frankenduck

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Re: Will this rack from a k1100lt fit a 92 K75rt?
« Reply #5 on: August 21, 2023, 09:41:58 AM »
Nice bit of arcane information, frankenduck. I had trouble taking my eyes off the zip-tied license plate to start reading it though.  :laughing4-giggles:

That's a UK K100 frame. (I guess the plate is married to the frame VIN over there. :idunno:) I was looking for good frame pics one day and found that frame on Ebay UK.
Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
New to K bikes? Click here.
K Bike Maintenance & Mods: Click here.
Buy parts here.

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