PROX Crankshaft Bearing for SHERCO SE 50 and BETA RR 50 2003-2026

PROX offers this engine bearing for SHERCO SE 50 and BETA RR 50 2003-2026. The engine’s shafts run on ball or roller bearings in the cases. They carry heavy loads at high revs and eventually develop play.

What is this bearing made of?

Races and balls (or rollers) in hardened chrome steel, 100Cr6 type: a very hard steel that withstands the fatigue of millions of engine revolutions.

• Open bearing: unsealed, it is lubricated and cooled by the engine oil; clean oil is its best protection.
• C3 / C4 internal clearance: slightly more clearance than normal for a hot engine’s expansion; always refit the original clearance.
• Limit: it dislikes dust and old oil; running short of oil destroys it within minutes.

Why choose PROX?

ProX uses Koyo or NTN bearings, largely made in Japan in OEM factories, with the original internal clearance (C3 / C4).

When should you replace the bearings on your SHERCO SE 50?

On competition bikes the main bearings are replaced at every bottom-end rebuild, at the hours recommended by the manufacturer. With the cases open, spin each bearing by hand: the slightest rough spot means it must go.

Specifications and fitting tips

• Dimensions: 17x47x14 mm
• Manufacturer part number: 23.6303C3

Spare parts and items to plan

• Engine oil seals : ATHENA P4E0010450001 · ATHENA P400010450003
• Complete engine gasket kit : ATHENA

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
BETA RR 50 2026
BETA RR 50 2025
BETA RR 50 2024
BETA RR 50 2023
BETA RR 50 2022
BETA RR 50 2021
BETA RR 50 2020
BETA RR 50 2019
BETA RR 50 2018
BETA RR 50 2017
BETA RR 50 2016
BETA RR 50 2015
BETA RR 50 2014
BETA RR 50 2013
BETA RR 50 2012
BETA RR 50 2011
BETA RR 50 2010
BETA RR 50 2009
BETA RR 50 2008
BETA RR 50 2007
BETA RR 50 2006
BETA RR 50 2005
SHERCO SE 50 2025
SHERCO SE 50 2024
SHERCO SE 50 2023
SHERCO SE 50 2022
SHERCO SE 50 2021
SHERCO SE 50 2020
SHERCO SE 50 2019
SHERCO SE 50 2018
SHERCO SE 50 2017
SHERCO SE 50 2016
SHERCO SE 50 2015
SHERCO SE 50 2014
SHERCO SE 50 2013
SHERCO SE 50 2012
SHERCO SE 50 2011
SHERCO SE 50 2010
SHERCO SE 50 2009
SHERCO SE 50 2008
SHERCO SE 50 2007
SHERCO SE 50 2006
SHERCO SE 50 2005
SHERCO SE 50 2004
SHERCO SE 50 2003