The bgm PRO Racing Shaft is designed as a stable shaft for ESC class 1 drivers.
With 51mm stroke, 97mm connecting rod length and a stable Ø24mm alternator stub, it offers ideal conditions as a full cheek shaft to fully exploit the limits of this racing class.
The large crank webs offer significantly more overlap over the crankpin, resulting in a higher pressure dimension and thus maximum torsional resistance.
Due to the large diameter of the crank webs, the crankcase must be spindled to Ø88mm. A later ascent to the 54mm shaft for even more displacement and performance is possible without any problems, the cheek diameters are identical.
Assembly NOTE:
PK125 XL/ETS
In PK 125 XL2 and PK125 ETS engine housings, the standard alternator bearing of ETS/PX models is used (NBI253815).
V50, PV, ET3, PK50, PK80/125S
All other engine housings (V50, PV, ET3, PK50, PK125S etc.) require either a bushing on the alternator side for conversion to an NBI bearing (see accessories) or a conversion ball bearing (6005 C3). This bearing, which is narrower than a 6204 bearing, is fitted with a Ø47mm snap ring (align open end with oil hole in housing). This completely compensates the smaller width of the 6005 bearing
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