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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: bluebossa on September 26, 2018, 02:03:13 PM

Title: RT Front Suspension K75 1991
Post by: bluebossa on September 26, 2018, 02:03:13 PM: Just wondering if it has improved springs or shocks over a C or T unfaired bike... It would make sense considering extra weight of fairing, but is it heavier duty in any way?

Any one know?
Title: Re: RT Front Suspension K75 1991
Post by: Laitch on September 26, 2018, 02:44:48 PM: Quote from: bluebossa on September 26, 2018, 02:03:13 PM
Just wondering if it has improved springs or shocks over a C or T unfaired bike... It would make sense considering extra weight of fairing, but is it heavier duty in any way?
Here's a table showing the evolution. The Showa fork was considered superior and was used in production from 8/91.
(http://www.motobrick.com/gallery/1/1601-260918144417.png)
Title: Re: RT Front Suspension K75 1991
Post by: bluebossa on September 26, 2018, 06:19:19 PM: Quote from: Laitch on September 26, 2018, 02:44:48 PM
Here's a table showing the evolution. The Showa fork was considered superior and was used in production from 8/91.

Thanks Laitch - how can I find out if it's a Showa - mine was registered in 6/91
Title: Re: RT Front Suspension K75 1991
Post by: Laitch on September 26, 2018, 07:18:54 PM: The comparative measurements are found in the fourth column from the right side.
Title: Re: RT Front Suspension K75 1991
Post by: bluebossa on September 27, 2018, 03:29:06 PM: Quote from: Laitch on September 26, 2018, 07:18:54 PM
The comparative measurements are found in the fourth column from the right side.

Thanks - bloomen eck, 0.3 of a mm - tricky to measure - but tried, seems like 40mm... not got any calipers

Any other outside way of telling whether it's showa or not?
Title: Re: RT Front Suspension K75 1991
Post by: Laitch on September 27, 2018, 06:53:09 PM: Quote from: bluebossa on September 27, 2018, 03:29:06 PM
seems like 40mm... not got any calipers
:twak:

Sure, there's another outside way of telling one from the other.

Go to MAX BMW's parts fiche. Go to Model. Click on K75RT. Choose Front Suspension. Compare the axle mount in the diagram of Inner Tube-Sport with the axle mount in the diagram of Fork Slider, which is the Showa. Then look at your photo. Any bells ringing?
(http://www.motobrick.com/gallery/1/1601-270918183659.jpeg)
Title: Re: RT Front Suspension K75 1991
Post by: Laitch on September 27, 2018, 07:11:17 PM: Quote from: bluebossa on September 26, 2018, 06:19:19 PM
Thanks Laitch - how can I find out if it's a Showa - mine was registered in 6/91
If the Showa was adopted in 08/91 production and yours was registered in 06/91, well then . . .
Title: Re: RT Front Suspension K75 1991
Post by: bluebossa on September 28, 2018, 12:06:22 PM: Quote from: Laitch on September 27, 2018, 06:53:09 PM
Sure, there's another outside way of telling one from the other.

Go to MAX BMW's parts fiche. Go to Model. Click on K75RT. Choose Front Suspension. Compare the axle mount in the diagram of Inner Tube-Sport with the axle mount in the diagram of Fork Slider, which is the Showa. Then look at your photo. Any bells ringing?
(http://www.motobrick.com/gallery/1/1601-270918183659.jpeg)

You're a marvellous chap, a detective and I thank you for your patience - Sport then.... not SHOWA
Title: Re: RT Front Suspension K75 1991
Post by: bluebossa on September 28, 2018, 12:07:07 PM: Quote from: Laitch on September 27, 2018, 07:11:17 PM
If the Showa was adopted in 08/91 production and yours was registered in 06/91, well then . . .

And as you probably know Laitch - dates and things on Bikes don't always work as precisely as that... but thanks again...