Seal material property comparison

A “strenght & weakness” overview of the different seal materials available in the market.

Spark Plugs

Click image for table    

List of fasteners R50 – R69S

A comprehensive list of bolts, nuts and washers for the R50 – R69S models Click image for list :                          

BMW motorcycles in the Netherlands

The information below comes from the Dutch RDW database (= Dept. of Motor Vehicles) In the Netherlands, there are at least 164 registered BMW motorcycles from the (pre-)war era and at least 3,225 registered BMW motorcycles from the 1948 – 1969 era – 3.225 motorcycles makes +- 1.2% of all R24 – R69US motorcycles built by BMW – of these 3,225 motorcycles,  almost half (48%) are /2 models (R50 – R69US) – 36% of these motorcycles is 25 years or more with the current owner, longest period is 58 years (situation 2019) – about 10 of these motorcycles have only
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Some statistics based on last 5 years (2013 – 2018)      

Rim width

The width of rims can be measured in 2 different ways: the inside or the outside. This means that one and the same rim can be indicated both in (for example) 2.15 “and 3.08″ WM2: inside 1.85″ (47 mm) outside 2.72″ (69 mm) WM3: inside 2.15″ (55 mm) outside 3.08” (78.2 mm)      

Bearing prefix & suffix codes

Some of the prefixes and suffixes found on bearings in the webshop: Prefixes: NJ = these bearings have two integral flanges on the outer ring and one on the inner ring. These bearings are used to locate the shaft axially in one direction. They can accommodate axial displacement of the shaft relative to the housing in one direction only. Example: NJ204 bearing on the rear side of the gearbox input shaft (R51/2 – R68) Suffixes: ECP = bearing with polyamide plastic cage M = brass cage MA = brass cage, outer ring centred C2 = bearing with internal clearance smaller than normal
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Valves types and related components

Overview of the different valve types and related components, used in the BMW 1 and 2-cylinder motorcycles 1948 – 1969

ISO Metric screw thread

Overview of ISO metric screw threads M3 – M30. Commonly used screw threads on 1948 – 1969 BMW models are M6x1 coarse, M8x1.25 coarse and M8x1.0 fine.   The length of bolts and screws is measured like this:                


Overview of carburetor nr’s and settings