BMW K bikes (Bricks)

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67TigerMK11

67TigerMK11
New member
New member
Hi, new to the forum. I just purchased an 87 K100RT and it is a little tall. I have changed the seat to a corbin "Gunfighter and Lady" and it helped. It also need tires, hence my question. I have read many of the tire recommendations from the members, but haven't seen anything on the Conti "GO". The reviews are good, but they are on all different kinds of bikes. Anyone here tried them? Do you like them? I have a 15 mile twisty commute to work in rural CO. I'm 62 and don't ride real hard but I do enjoy speed.

I have read the stock size tires are 100/90-18 front and 130/90-17 Rear. It appears that most people in the forum use one size larger but with a 80 series profile, 110/80-18 and 140/80-17. Would these 80 series tires be any smaller in diameter than the 90 series in the recommended size? They also make a 130/80 and 130/70 that looks like it would fit. Will these work on my k100, and is it safe to mix different profile tires. Does any of this make sense? Mostly I'm trying to get a feel for if the oversize tires with the lower profile "80" make the bike taller or lower than it currently is. I currently have dunlops in the recommended size. Any taller would not be good for me. Thanks, Jerry

    

RicK G

RicK G
admin
admin
Hi Jerry, I don't think you would get more than a few mm out of an 80 as to a 90 profile.
My wife rides the K75 and she is a shortie so we put a rear shock on that is 30mm shorter and that gives 25mm at the seat we also dropped the forks through about 20mm and that was enough to do the trick. Also put a lower profile rear tire on as it helped a bit more, a 13/70/17 which is about 10mm lower again. Some ground clearance was lost but it doesnt matter as she doesn't ride hard and doesn't miss it.
I call the bike a K75RTSA the SA being for short arse.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

beanoldboy

beanoldboy
Life time member
Life time member
tiger , the middle number is the sidewall height expressed as a percentage of the tyre width (first number ) in mm .
hope that helps .
N.

http://www.airware.com.au
    

Peter_Skov

Peter_Skov
Silver member
Silver member
@Rick G wrote:..
My wife rides the K75 and she is a shortie so we put a rear shock on that is 30mm shorter and that gives 25mm at the seat we also dropped the forks through about 20mm and that was enough to do the trick.
...
I call the bike a K75RTSA the SA being for short arse.
lol!

I'm also a SA, but, what did you do to the stands. I imaging it must be impossible to get it on the centerstand, for instance when refueling?
(cut and weld, og can you buy a short one?)


__________________________________________________
Cheers
Peter
K75RT Polizei Spritmonitor.de

Getting a k100 a little lower by changing tires? Denmar10
http://www.skovbryg.dk
    

RicK G

RicK G
admin
admin
I can get it on the centre stand but it is very difficult. I did look at making it shorter but decided not to do it.
I cut about 15mm out of the side stand right down at the base, actually it could be done only cutting 10mm out as it still leans over too far.
If you want a shorter shock then Hagon and RAM SHOX both make a 30mm shorter version. I prefer the RAM as you get a better ride.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

K75cster

K75cster
Life time member
Life time member
Leaving the stand alone and rolling the bike back wards will give you enough kinetic energy to stand on the stand and lift it up, one hand on the handle bars and one on the lifting handle, in one rolling movement it does work.


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

Peter_Skov

Peter_Skov
Silver member
Silver member
@K75cster wrote:Leaving the stand alone and rolling the bike back wards will give you enough kinetic energy to stand on the stand and lift it up, one hand on the handle bars and one on the lifting handle, in one rolling movement it does work.
That is also how I do it today, I just imagined that it would be to much lift, if it was lowered.


__________________________________________________
Cheers
Peter
K75RT Polizei Spritmonitor.de

Getting a k100 a little lower by changing tires? Denmar10
http://www.skovbryg.dk
    

club_c

club_c
Life time member
Life time member
@67TigerMK11 wrote: I have read many of the tire recommendations from the members, but haven't seen anything on the Conti "GO".

I put a front Conti GO on my '85 K100RT last year, and sold the bike soon after. I was happy with quality and balancing. I bought it on line at a a good price...


__________________________________________________
"There's never enough time to do it right, but there's always time to do it over."

1988 K100RS SE VIN 01477554
    

K75cster

K75cster
Life time member
Life time member
Peter It might be, but i cant confirm as I used to load mine up for bike rallies with half a camp site and lift it so maybe, It is just the 1st part of the lift though, so with alittle movement to back it up, all should go ok. Like 67tiger I am 6foot tall so maybe its just an advantage i'm not able to compare with. I do weigh 17 stone or 105kg so maybe like a see-saw if I say lift then it lift's allbeit a small see-saw on our centre-stands. But i would like to sit this K bike like I sat the old Triumph I had before it. I cant grow my legs but I can shrink the bike,(this will be where the washing bike jokes come in)


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

RicK G

RicK G
admin
admin
Lifting the K75 up when it's lowered is very hard but I can do it so I left the stand alone.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

K75cster

K75cster
Life time member
Life time member
It makes that much of a difference rick?. My 75 stand is the curved stand the one on it at present is the straight leg version from the 100, I can imagine the straight leg version can be tweaked easily but wonder what people think of the curved stands for modifying


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

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