PROX engine bearing 30 × 62 × 16 mm for BETA RR 250, RR 350, RR 350 EFI, XTRAINER 250 LC, XTRAINER 300 LC from 2013 to 2023

Check before ordering

• Dimensions (inner × outer × width): 30 × 62 × 16 mm

PROX offers this engine bearing for BETA RR 250, RR 350, RR 350 EFI, XTRAINER 250 LC, XTRAINER 300 LC from 2013 to 2023. 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 BETA RR 250?

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

• Application: Crankshaft
• ProX bearings are made in major bearing manufacturers' factories, mainly in Japan
• All bearings are made to OEM specifications for optimum quality and performance

Cross-Mania tip: Heat the cases to remove and fit the bearings without forcing them, and replace the oil seals at the same time.

Also needed with this part

• Complete engine gasket kit : PROX 35.7313 · PROX 35.7360
• 2-stroke oil : LIQUI MOLY 1 L · LIQUI MOLY 4 L

Compatibility

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

Fits:
BETA RR 250 2021
BETA RR 250 2020
BETA RR 250 2019
BETA RR 250 2018
BETA RR 250 2017
BETA RR 250 2016
BETA RR 250 2015
BETA RR 250 2014
BETA RR 250 2013
BETA RR 350 2014
BETA RR 350 2013
BETA RR 350 EFI 2021
BETA RR 350 EFI 2020
BETA RR 350 EFI 2019
BETA RR 350 EFI 2018
BETA RR 350 EFI 2017
BETA RR 350 EFI 2016
BETA RR 350 EFI 2015
BETA XTRAINER 250 LC 2021
BETA XTRAINER 250 LC 2020
BETA XTRAINER 250 LC 2019
BETA XTRAINER 300 LC 2023
BETA XTRAINER 300 LC 2022
BETA XTRAINER 300 LC 2021
BETA XTRAINER 300 LC 2020
BETA XTRAINER 300 LC 2019
BETA XTRAINER 300 LC 2018
BETA XTRAINER 300 LC 2017
BETA XTRAINER 300 LC 2016
BETA XTRAINER 300 LC 2015