Statistics

Some statistics based on last 5 years      

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 3.00”    

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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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:                

Carburetors

Overview of carburetor nr’s and settings