Front crankshaft bearing for all 2-cylinders.

Rear crankshaft bearing for R26, R27, R51/2 - R67/2, R50, R50/2, R60, R60/2

(R68, R50S, R69 and R69S use 20207 C3 rear crankshaft bearing: PN 07119983301)

Tolerance class: C3 (=radial internal clearance min. 15 µm max. 33 µm)

Interference fit of inner bearing race with crankshaft bearing journal: 0.015 mm (BMW spec.)

NOTE: the C3 bearing is recommended when a new rear main bearing holder has been installed and reamed to the correct ID: this will give a tighter pressfit for the bearing, hence a slightly larger tolerance (C3) is needed.

D = 72 mm

d = 35 mm

B = 17 mm