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1Back to top Go down    R1150 rear wheel on a K100RS paralever on Sat Jan 14, 2017 5:23 pm

AL-58

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Wanting to put a 17" wheel on the rear to replace the wide 18" (for easier access to tyres and greater choices) I bought a K1200RS rear wheel on fleabay for a seemingly good price. When it arrived I found it was actually an R1150 rear wheel, still 5.0 x 17" but with cast mountings for the rear disk built into the wheel. I got a refund and told to keep the wheel as postage back was just an extra cost to the vendor.

So I have a free wheel to play with. I cut the disk mountings off after a few hours of graft and the use of many different cutting and abrasive tools.

I hadnt considered that the 2 different wheels may have a different offset but it appears they do. I've fitted a Metzeler Roadtec Z6 front and rear (after a disappointing <10,000kms on a pair of Angel GTs).

Visually from the rear you can easily see the tyre is fitted left of the centreline. A test ride proved the bike is quite safe to ride, doesnt display any evil handling traits, but if you take your hands off the bars it turns to the right every time. I can fit a whole finger between the tyre tread and the swingarm without compressing my finger much at all so I have a fair bit of leeway.

So next mod will be the get some material removed from the bolt face to shift the wheel back towards the centre (not running any spacers at this stage. I'm thinking 10mm as I can always use spacers to bring it back the other way if needed.

Al

PS: The wide RS 18" wheel is not for sale as I want it to be available for the day I will want to put the bike back to bone standard. However if someone (local) wants to borrow it to see how their bike feels with a wider rear before committing to buying one I'm open to requests. It has an Angel GT Radial fitted with maybe 1000km to go before it hits the wear markers.


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'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

2Back to top Go down    Re: R1150 rear wheel on a K100RS paralever on Sat Jan 14, 2017 11:04 pm

RicK G

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I fell into exactly the same trap Al except the wheel I have is from a R1100S.
I haven't investigated but I have a feeling the K1200 wheel will be the same. I think the K1200 rear drive allows for more offset I just had a look and there is 19.2mm more offset to the left than from a K1100 rear wheel which has the same offset as the K100 16V. Don't think there is much chance of making it fit if it is the same dimensions as the one I have.
What we meed to find out now, is the K1200 wheel different in the offset.
More thinking (shit this is hurting) the wheel with the disc mounts on it will need more offset because the thickness of the disc needs to be taken into consideration and the K1200 has the disc attached to the hub not the spokes.

Some more investigation shows that the wheels are not the same despite having the same 5 spoke design.
I have seen the 5 spoke design on the K100/1100 paralever so there is a way to do it.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

3Back to top Go down    Re: R1150 rear wheel on a K100RS paralever on Sun Jan 15, 2017 12:46 am

AL-58

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Well the wheel cost me nothing so I've got nothing to lose anyway. Doing some raw measurements I can afford to take 12mm off the mounting face with no caliper clearance problems. I still think I'll have clearance between the tyre and the swingarm at that, if not a spacer will sort it anyway.

Al


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'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

RicK G

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You can sneak 3-4mm by spacing the pivots across.
There is a picture of a K1100 that has the 5 spoke wheels on Glumtree and it looks like the back wheel is well over to the left but pictures can be very deceiving.
There is heaps of meat to do some machining on the hub face, you could take 12mm of that OK.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

5Back to top Go down    Re: R1150 rear wheel on a K100RS paralever on Mon Jul 10, 2017 12:26 am

AL-58

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At last!

Through the BMW club I found someone that knew of/with access to a lathe large enough to mount a 17" wheel.

13mm has been removed from the boltface. With a 170/60 tyre mounted on the wheel I can just pass a 3mm allen key through the gap between the tyre edge and the swingarm (no wheel spacer fitted when mounting the wheel). There is still some left offset but nothing more to gain.

Though it should be wider, the new Metzeler MEZ4 170/60-17 is narrower than the 160/60-18 Pirelli Angel GT previously fitted, it was much easier to wriggle past the caliper. If future tyres are wider, I still have spacers to use.

The wheel bolts are now too long by a little. Instead of replacing the bolts with new shorter bolts (then having to carry different tools) I am using 2 zinc-plated HT washers on top of the tapered doovy that seats in the wheel. All snug now.

There appears to be no runout.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

Two Wheels Better

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That's a nice little mod you've done. Hows about a piccie of the back end and a side view if you have a mo'. It'd be good to see what she looks like. I'm always playing with these things and another in the arsenal can't hurt. Ta.


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'77 R75/7-1000cc, '87 K100RS, '93 K12 Big Block, '94 R100 Mystic, '03 K1200GT, '04 R1150RT, '06 K1200R, '07 K1200R & '09 K1300GT
Two Airheads, three Bricks, an Oilhead and a trio of new K's.
    

duck

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If you need a center stand that will accommodate a wider wheel then a K100RS4V/K1100 center stand will bolt right up.

It is a tad shorter than a 2V centerstand but to deal with you can add some washers/spacers between the mounting plate and the transmission like BMW did at the factory on K1100LTs.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

AL-58

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@duck wrote:If you need a center stand that will accommodate a wider wheel then a K100RS4V/K1100 center stand will bolt right up.

It is a tad shorter than a 2V centerstand but to deal with you can add some washers/spacers between the mounting plate and the transmission like BMW did at the factory on K1100LTs.

The bike is a K100RS4V. So it already has the stand.

Re the pics for TWB, I'll get some later today. Looks exactly the same from the side as a K1200RS would.

If the wheel wasn't free (which it was after the refund) I wouldn't bother doing it. The wheel machining cost me the time to cover a seat for a mates airhead caffe racer that he's building.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

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