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1Back to top Go down    My "new" 1987 K100 Custom on Sat Sep 22, 2018 2:49 pm

Ahi

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Hi. I'm here for info! I have an 87 with stock rear wheel and swing arm. I wanted to install the 5.5" REAR wheel from the newer models. Just wanted to know if it's a straight up install?

I found a used 4 bolt rim, pretty cheap. Just wanted to get some guidance before investing on a project I won't be able to complete.

    

2Back to top Go down    Re: My "new" 1987 K100 Custom on Sat Sep 22, 2018 8:09 pm

RicK G

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You wont get a 5.5 rim in there


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

3Back to top Go down    Re: My "new" 1987 K100 Custom on Sat Sep 22, 2018 9:48 pm

Ahi

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So I was reading another thread on here when someone else did the exact same thing (on a 1990)... He showed pics of it, bolted on, and although it was very close to the swingarm, it ended up working. Did I read that wrong?

Are there any other options if someone wanted to run a wider rim on these older narrow setups?

Any guidance would be appreciated



    

4Back to top Go down    Re: My "new" 1987 K100 Custom on Sat Sep 22, 2018 9:59 pm

charlie99

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ben kingham runs a 5.5 on a standard bevel box ….but modified exhaust and out of the way



a 1990 should have the paralever rear end and would fit and be close to centre alignment  , but still have to consider the centre stand getting in the way on both models


good luck


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'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

5Back to top Go down    Re: My "new" 1987 K100 Custom on Sun Sep 23, 2018 4:52 am

Ahi

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I should have mentioned I no longer have the center stand. So you're saying a 1990 and 1987 have different swingarm?

Could I replace anything easily on the rear to make this work?

    

6Back to top Go down    Re: My "new" 1987 K100 Custom on Sun Sep 23, 2018 5:05 am

charlie99

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perhaps you could clarify which exact model you have ?

or does the swingarm have a joint before the differential- final drive ?

edit just reread the post ...87 so should be a monolever  rear end  with standard bevel box
without centre stand is about the best your going to get ...don't know of any that have done different .  you will notice when observing from the rear that the centre line of the tyre will be way offset ...to the original rim- wheel ...in excess of 15mm

to use the k1100 -k100 16 valve versions rear end  ( needs a suitable gearbox with the extra lug for the bar to the gearbox )  and it would move the tyre closer to the centre line ..(because the paralever rear drive and connections offset is different ...simple explanation )


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

7Back to top Go down    Re: My "new" 1987 K100 Custom on Sun Sep 23, 2018 6:21 am

Ahi

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Thank you for that. In my research, I came across this thread where a member with same bike (1985) did the same thing, with no modifications at all. Am I reading this wrong? I just don't understand why there are so many contradictions to this question.

He literally bolted up the K12 5" rear rim with a 175 tire... Only thing he needed were the K12 wheel bolts.

https://www.k-bikes.com/forums/56-other-k-bikes-discussion/24161-yes-can-done-170-tire-85-k100.html#/topics/24161

I do see how the wheel is sitting a bit off to the left (not centered). Not so concerned with this, I'm more concerned with how he says it requires no modifications, but so many others described so much work to make this happen.

    

8Back to top Go down    Re: My "new" 1987 K100 Custom on Sun Sep 23, 2018 9:55 am

charlie99

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ive put a 4.5 on the rear of Gerty  with a 165    (oops )   160 tyre

rides ok , but had to mod the centre stand

the replacement cost of the tyre has got me back to the standard till the budget recovers ….lol








Last edited by charlie99 on Mon Sep 24, 2018 2:36 am; edited 1 time in total


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

9Back to top Go down    Re: My "new" 1987 K100 Custom on Sun Sep 23, 2018 10:54 am

Ahi

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Sorry, what is a Gerty?

    

10Back to top Go down    My "new" 1987 K100 Custom on Sun Sep 23, 2018 11:44 am

norton71

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A "Gerty" is Charlies loving name for his bike but with the tyre size he is using it is getting near to a Hardly Can Sad

    

11Back to top Go down    Re: My "new" 1987 K100 Custom on Sun Sep 23, 2018 4:22 pm

Laitch

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@Ahi wrote:In my research, I came across this thread where a member with same bike (1985) did the same thing, with no modifications at all.

He literally bolted up the K12 5" rear rim with a 175 tire...  Only thing he needed were the K12 wheel bolts.
He writes that he needed to remove the center stand to make it work, as Charlie also mentioned. That would qualify as a modification.


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12Back to top Go down    Re: My "new" 1987 K100 Custom on Sun Sep 23, 2018 8:40 pm

Two Wheels Better

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I can attest to a K1200RS rear wheel with the correct wheel lugs sliding right onto the back of a Paralever FD with no issues, but it's a 170/60ZR17 as there is no '175' tyre size. Also, a 160/60ZR18 (not 165) fits onto a Monolever with no trubs. Both need centre stand mods (or removal) to clear.


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1987 K100RS, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '04 R1150RT, '95 R100 Mystic, '77 R75/7.
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13Back to top Go down    Re: My "new" 1987 K100 Custom on Sun Sep 23, 2018 10:18 pm

Ahi

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Amazing!

    

14Back to top Go down    Re: My "new" 1987 K100 Custom on Mon Sep 24, 2018 11:34 pm

JR_K100RS

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G'day Ahi , if you get your hands on a three spoke 4.5x18 rear rim you can fit up a 160/60/18 as TWB has stated ( and Charlie has shared a rear pic of ) this is what I have done , Dunlop ( Roadsmart ) also make a 170/60/18 which is closer to the standard rolling diameter of the stock 130/90/17 tyre , if you use the 2mm spacer on the rear it may just fit in but double check before you shell out any $$$

John Re

Melbourne Australia


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15Back to top Go down    Re: My "new" 1987 K100 Custom on Tue Sep 25, 2018 12:17 am

Ahi

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Thank you. Only issue is that the 3 spoke won't really look great on this bike. So was trying to avoid it.

    

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