Differences BMW 2-Valve Paralever Monolever Twinshock

BMW Twinshock models

Production period up to 1984
TWIN for pair and SHOCK for shock absorber means it is a model with two shock absorbers on the right and left respectively and a rigid twin-sided swingarm. 
Twinshock models:  
R45 78-85 -- R60/5 69-79 -- R60/6 73-76, R60/7 76-78 -- R65 78-85 -- R65LS 81-85 -- R75/5 69-73 -- R75/6 73-76 -- R75/7 76-77 -- R80/7 77-84 -- R80RT 82-84 -- R90/6 73-76 -- R90S 73-76 -- R100/7 76-78 -- R100S 76-80 -- R100RS 76-84 -- R100RT 78-84 -- R100CS 80-84 -- R100 80-84 -- R100T 78-80
Fork diameter 36mm shock absorber length 330mm
The vehicles used for our conversions are mostly BMW R65, BMW R80, or BMW R100 models first registered from 1980 onwards; the older /5/6/7 models are rather rare.
All Twinshock models had a rear Drum brake, except for the R100RS 76-84 and the R100S 76-80 (both, however, only from 1978 onwards). The Final drives (shaft drives) were kept smooth on the outside until model year 1980; from 1980 onwards, they were then provided with circumferential cooling fins. (R80RT 82-84, R100 80-84, R65LS 81-85, R100CS 80-84).
The forks of all Twinshock models had a Diameter of 36mm. The last TS models from 1980 onwards already had the front Fixed caliper brake calipers of the later Monolever. All other Twinshock models, except for the early /5/6 models, which still had front drum brakes, had floating caliper brake calipers.
All R90, R75, R60 as well as the R100CS, R100/7 had Spoked wheels, all others Classic BMWs Cast wheels. The spokes of the Twinshock cast wheels were more delicate compared to the later alloy wheels of the Monolever models. However, retrofitting is not possible. At the back is for wide tires not much space, a 120 is the limit. We usually use rear 120/90-18 or 120/80-18 and front 110/80-19 or 110/90-19.
The /5 models had a short and somewhat higher tank, but the shape is already reminiscent of the later Monolever models. With the /6 came a flatter and smaller tank, which, however, did not catch on. From the /7 onwards, up to the last TS model, it was then the identical shape of the Monolever series.
The TS models have very lots of electrical components in the headlight housed. This makes converting it to a small lamp more difficult. With the SE wiring harness and the matching handlebar switches , however, this problem can be solved.
In terms of Bobber conversion is it with a Twinshock however, complicated. Since the suspension struts are attached to the rear frame, these mounts are no longer needed in the case of a conversion to a single seat. However, we can weld new mounts onto the main frame and the Register modification via individual approval let.  
The Twinshocks see through the Double-sided swingarm looks more classic. If you look at the production vehicles, the difference in terms of Braking and driving behavior huge. If the components are processed and modified accordingly, the difference is significantly smaller.

 

BMW Monolever models 

With a MONOLEVER It is a single-sided swingarm with a shock absorber on the right side. The swingarm is made of steel and is rigidly connected to the aluminum final drive. The shock absorber is attached directly to the main frame, independently of the rear frame, via a welded cast part. 
Monolever models:
Street: R65 85-93, R80 84-92, R80RT 84-94, R100RT 87-96, R100RS 86-92
Fork diameter 38.5mm shock absorber length 409mm 
Enduro: R80G/S 80-87, R80ST 82-84, R65GS 87-92
Fork diameter 36mm shock absorber length GS 365mm, ST 350mm
The firstBMW MonoleverThe model was the one introduced in 1980R80 G/Sand with that, also the firstOff-road motorcycle. For the road models, you take theZwitter R80STout, the rigid single-sided swingarm held up in 1984 with theR80RTEntry into the BMW model range. This drive concept was built until 1996, theR100RTwas the last Monolever model.
TheMonolever road modelshave aFork with 38.5mm stanchion diameterand double disc brakes (except R65). Installed at the front are brake systems withTwo-piston fixed brake calipers. For the enduro models, however, they stuck with the 36mm fork diameters and a single-disc brake system. At the rear, all models feature a drum brake.
TheBrake calipersare originalin front of the forkattached. It is possible to use bothswapping fork tubes from right to left, so that the brake calipers face backwards. Since the wheel axle is also slightly offset, this makes the bike even more maneuverable and agile.
The ML models have been the most popular base vehicles so far forBMW custom builds.Compared to the twinshock models, they feature wider rims, which allows for the use of wide tires. The forks and brakes are larger, although all street models come with cast wheels. However, we offer completeSpoked wheelsets (cross-spoked)wheelsets for retrofitting.
The shock absorber is attached exclusively to the main frame. This makes the monolever concept highly suitable for conversions to a single seatBobber conversions.