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jim in the north
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After just 30 years, shocks/springs seem to be worn out. Imagine that! Does anybody know a source for this part? Can they be re-built?
Bob's BMW in MD used to list them in their on- line catalogue, but doesn't anymore. I think they are called Nikormat or Nikomat or something like that in the maual. Engraved with factory stamp "BOGE 6-3012-10-078-0"

schrader7032
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It appears they can be,

It appears they can be, although not really designed for it:

http://brook.reams.me/about/bmw-motorcyle-rebuilds/1973-bmw-r755-rebuild...

There are a number of other choices such as Works, Ohlins, YSS, Wilbers. A straight forward shock is the Ikon...used to be Konis, but an Austrailian company bought them and basically offer the same product, different name.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

khittner
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If you have Boge Nivomats, I

If you have Boge Nivomats, I don't think they are rebuildable. They were the factory optional self-leveling shocks that came standard on some of the RSs and RTs---I have them on my '84 RT Last Edition. The only parts available for them now are the mount bushings and, perhaps (I hope), the rubber gaiters that cover the rods from the lower end of the shock body to the lower mounting eyelet. They're listed under "Leveling Device" on the airheads' parts diagrams. But if your Nivomats have stopped pumping up, I'm sad to say that they're probably irretrievably dead.

I love mine, but I'm in a distinct minority---most motorcyclists seem to want to be able to adjust and fiddle with their suspension settings, and the self-leveling Nivomats precluded that. The Nivomats also allowed a fraction of an inch less theoretical rear suspension travel, so many pairs were swapped out at very low mileages and replaced with Konis, Progressives, etc. I have a spare pair sitting on my workbench that I bought at a BMW flea market several years ago from the original owner who had taken them off of his RT early in its career. I need a pair of gaiters for them, and I haven't had them on to see if they'll still pump up, but they look nearly new, apart from the original gaiters that seemed to have fragmented on every pair I've ever seen.

Boge still produces Nivomat self-leveling shocks for cars (Volvo wagons had them for many years), but I've never found a current source for the motorcycle editions.

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Konrad

khittner
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*

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Konrad

khittner
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If you have Boge Nivomats, I

If you have Boge Nivomats, I don't think they are rebuildable. They were the factory optional self-leveling shocks that came standard on some of the RSs and RTs---I have them on my '84 RT Last Edition. The only parts available for them now are the mount bushings and, perhaps (I hope), the rubber gaiters that cover the rods from the lower end of the shock body to the lower mounting eyelet. They're listed under "Leveling Device" on the airheads' parts diagrams. But if your Nivomats have stopped pumping up, I'm sad to say that they're probably irretrievably dead.

I love mine, but I'm in a distinct minority---most motorcyclists seem to want to be able to adjust and fiddle with their suspension settings, and the self-leveling Nivomats precluded that. The Nivomats also allowed a fraction of an inch less theoretical rear suspension travel, so many pairs were swapped out at very low mileages and replaced with Konis, Progressives, etc. I have a spare pair sitting on my workbench that I bought at a BMW flea market several years ago from the original owner who had taken them off of his RT early in its career. I need a pair of gaiters for them, and I haven't had them on to see if they'll still pump up, but they look nearly new, apart from the original gaiters that seemed to have fragmented on every pair I've ever seen.

Boge still produces Nivomat self-leveling shocks for cars (Volvo wagons had them for many years), but I've never found a current source for the motorcycle editions.

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schrader7032
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Didn't Boge supply a simple

Didn't Boge supply a simple shock other than the Nivomat's? I think that is what he's talking about. Bob's has a replica of these old shocks...they possible could be used for the '83 RT.

A picture would help, of course!

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

khittner
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Yes, the OE rear shocks on

Yes, the OE rear shocks on most airheads (pre-load adjustable only) were also Boge shocks. But, I'm looking at one of my spare Nivomats now, and I see that the part number he cites is the same one stamped on my Nivomat.

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schrader7032
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Good to know...I've never

Good to know...I've never come face-to-face with a Nivomat before!

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

jim in the north
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replacement rear shocks 1983 R100RT

Thanks to you and Schrader for the info. I will call Bob's BMW to see if they have a replacement part. I didn't know to look under the catagory of leveling devices. I looked under suspension only. I have seen them in the on-line catalogue in the past listed as Nivomat shocks and they were expensive, but I did not find them when I searched this morning.

I think that this problem really only showed up now because I put Avon tires on the bike. The rear one is a bit fatter than the Metzler tire that I have always used and although the shocks were wearing, the Metzler was skinny enough to ride up inside the fender without touching the sidewall.( it now is just kissing the Avon side wall on the brake rotor side with only me aboard) The shocks were bottoming out with two-up on a good bump in the last couple of years. I guess they're worn out. 100,000 miles and 30 years.

I dropped the tire pressure from 30 to 28 psi and that seems to have shrunk the width of the tire enough to just miss the fender. I only ride one-up anyway so 28 is probably enough. I'm no speedster.

khittner
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100K on a pair of Nivomats!!

100K on a pair of Nivomats!! Good deal---I should have another 40K left before I have to slap the spares on. I've read somewhere (maybe in one of Snowbum's treatises) that their longevity is pretty impressive. And, if they're good enough for Volvo 240s, that works for me---of course, this may further illuminate why they never gained a real grip on the motorcycle market . . .

You might try an actual OE-sized 4.00 x 18 rear tire to resolve your fender clearance issue. I like my Micheilin Pilot Activ rear tire in that size.

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schrader7032
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Correct on the 4.00x18

Correct on the 4.00x18 tires...they are definitely available. I just ordered a Michelin Activ for my rear to match the front Activ. Avon makes decent inch-sized tires. Benefits of using the proper tires: shock clearance, swingarm clearance, ease (or at least easier) removal of rear tire when fixing a flat or servicing the splines, proper geometry for good handling and stability, and proper actuation and support of sidestand. I really noticed this last thing when I had metric tires front and rear. Metric tires are smaller in profile, so the bike was somewhat closer to the ground. That meant that the sidestand would enounter the ground sooner, and thus the bike stood more upright when on the sidestand...that actually resulted in it falling over at one gas stop...kind of embarrassing.

So what tire are you running in the rear? If it's a 120 sized tire, that is way to big for the twin shock Airheads. A fat tire does nothing for handling...a fat tire in the front actually hurts handling because of the extra distance needed to move the tire off the center patch. As I said, it gets into the fine details of steering geometry.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

c.d.iesel
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Nivomat shocks ( twin and single shock models )

back to the NIVOMAT, self-leveling single shock

I just installed a new one ordered from MAX BMW Danbury CT
on my 1986 R65 and love the improved handling and ride
quality. The Boge NIVOMAT single shock is listed as an Option
for all mono-lever, single shock air heads.

There's a different Nivomat shock for earlier Twin-Shock models.
Original BMW standard equip on R100RT s

up to 1984 R100RT w/ twin-shocks 33.53.2.301.545 = N.L.A (no longer available)
look for good USED Nivomats as replacement. Many were removed infavor of
conventional shock with coil springs thinking that improved handling resulted

1985>on R100RT w/ single-shock 33.53.1.452.351 = $475 from any BMW Dealer
Actually not a bad price considering alternative of regular shock with
coil spring(s). The NIVOMAT is a high tech suspension unit.

not rebuildable

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VBMWMO#5514- '64 R27 15K #383851 - '86 R65 22K #6128390 - '13 Fiat ABARTH #DT600282 - '11 FORD TRANSIT Connect #058971 - Retired m/c road racer (1971-2000) - Former M-Benz Star Tech 19 years, BMW Master Tech (cars) - Certified BMW (bike) Tech. Presently BMW Car Sales

c.d.iesel
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Jim, Nikormat = a camera

Jim, Nikormat = a camera

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VBMWMO#5514- '64 R27 15K #383851 - '86 R65 22K #6128390 - '13 Fiat ABARTH #DT600282 - '11 FORD TRANSIT Connect #058971 - Retired m/c road racer (1971-2000) - Former M-Benz Star Tech 19 years, BMW Master Tech (cars) - Certified BMW (bike) Tech. Presently BMW Car Sales

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