BMW K bikes (Bricks)

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Two Wheels Better

Two Wheels Better
Moderator
Moderator
I bought this unusual wheel some time ago, an 18x4.5" modded Y spoke. It was originally a standard 17x2.75" rear Y spoke for disc brake model K75 & K100 until Kosman Racing had a look at it. Luftmeister used to sell these as an "upgrade", painted white along with a K11 centre stand for added clearance. It was part number 950 in their catalogue and came with a 160/60ZR18 tyre already fitted, and a new standard 18" front wheel painted white. Remember, this was back in the day when no one was using the now-common 180/55ZR17, even 170/60ZR17 was rare, so a "phat" 160mm tyre was all the rage. I'm selling this one.

Kosman, a California-based company that had been modding wheels since before Lennon wore granny spectacles, sliced off the wheel rim edge and welded Akront 18 x 3.5" flanges on either side to make it a 4.5" width and accept an 18" tyre. The wheel spins straight and true.

I removed the ragged old Metzeler MEZ2 radial that had a build date of the 44th week of 2004, unscrewed the metal stem and chucked the wheel up onto my spin balancer. The bare wheel only took a single 5 gram weight! The welds are like the Werewolf of London's hair....Perfect! I'll have a piña colada, please.

PM me if interested. Or learn more on eBay US.


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1987 K100RS, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

chris846

chris846
Platinum member
Platinum member
That wheel is lovely.

(Like the Zevon reference too - why is it that some lyrics just stand out and get remembered?)


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The Longest Lunch
    

chris846

chris846
Platinum member
Platinum member
GIMME THE WHEEL...

FOR MY K BIKE!


__________________________________________________
The Longest Lunch
    

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
I have come across these wheels before, nice ones.


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1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 87,980 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
@chris846 wrote:That wheel is lovely.

(Like the Zevon reference too - why is it that some lyrics just stand out and get remembered?)
Sadly, ol' Warren left us a coupla years ago, but he made One Last Record before he died that has more than a few gems on it. Whenever I'm rolling along through the high altitude, grassy plains of the eastern frontal range of Colorado I can't help but whistle along to Things to Do In Denver When You're Dead.



Last edited by Two Wheels Better on Sat Jan 26, 2019 12:24 am; edited 1 time in total


__________________________________________________

1987 K100RS, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

duck

duck
Life time member
Life time member
Does a 4.5 work with a mono swing arm?

(I put 3" 3 spokes on my monolevers because I figure they weigh less and will spin up faster.)


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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 (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Sure, I have a 3 spoke set (K1100RS rear, K75S front) on my red RS in OZ and it's Monolever. Gotta remove the caliper and slide the exhaust leftward a bit to get the wheel n tyre out, but.

Spin up faster? I thought we were all about low revs, torque n comfort. Spin up faster is my K12R or 13GT.


__________________________________________________

1987 K100RS, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

duck

duck
Life time member
Life time member
Yeah, I know our old Ks aren't Busas by any means but every little bit helps, right?

From my perspective a lighter brick is a better brick. (Says the guy who likes to ride K1100s.)


__________________________________________________
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 (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
@duck wrote:Yeah, I know our old Ks aren't Busas by any means but every little bit helps, right?

From my perspective a lighter brick is a better brick. (Says the guy who likes to ride K1100s.)
Has anyone got a bare Y spoke rear wheel easily accessible to weigh? I'm curious what it weighs as compared to this Kosman, at 5.8 kilos (12.7Lbs).

It's true that weight reduction makes a Brick feel better, more 'flickable' on the road. I loved my long-gone K75C for the combination of reduced vibes, the perception that it revved up more easily than a K100, and was at least a few kilos lighter, on average.

Reduced weight can also bring issues one normally doesn't think too much about. When I was building Big Block, I was looking at the frame and the stack of parts on the garage floor that were not going to put back on the finished machine. I had a favour due, so Klaus @ EPM made me a Wilbers rear shockie to suit a K100 that would never carry a pillion, have 80+ Lbs removed, and yet be sporty enough for corner carving. When I received it I was gobsmacked at the size of the spring. It was a wee thing. So, I got out the spanner and adjusted the preload tension as I normally do, halfway or so - too stiff and jouncy. In the end, after much fiddling, I settled on leaving it down the bottom end of its range, with damping at <1/3 of adjustment from bottom, too. As for the Marzocchi forks I found lighter springs and use 5W oil - that combo feels very supple over ripples but planted. This bike has a 120/70ZR17 front, 170/60ZR17 K1200RS tyre/wheel combo, and it spins up out back right now.


It looks as though the sun's gunna burn off this late January morning fog so perhaps a ride on BB is the order of the day.


__________________________________________________

1987 K100RS, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
This fine wheel "will sell" on eBay. Someone gunna be happy.
cheers


__________________________________________________

1987 K100RS, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

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