• NOTE: Direct replacement upgrade for Stock GAUI Part#, 803729 / 208760 / 0B1503
• Use for: (X-Series) Tail Case: GAUI X4 / NX4 / X5 / R5
• Use for: lower bearing mount: GAUI X4 / NX4 / X5

• Replace the GAUI X4 II/NX4/X5/R5 (X Series) Tail Case bearings with these quality deep groove high performance ABEC-5 "RED SEAL" bearings with much higher tolerance, Longer life, and smoothness.
• These bearings are sealed, pre-greased, and ready to go.
• The special RED Nitrile Rubber seals keep Gear dust and metal shavings out!
• ABEC-5 Precision Deep Groove bearings.
• Bearing Size - 5X11X4
• Deep groove geometry helps support both radial and axial loads!

Bearing Upgrade Kit Includes: 1 Set (2 Bearings as pictured above).

If a Retailer/Vendor does not specify which ABEC rating, it's likely that's it's ABEC-1, or even lower(not rated)! Many helicopter kits come standard with ABEC-1 steel bearings. ABEC-5 bearings are much tighter in tolerance, thus providing much higher accuracy, better efficiency, longer life, and smoothness.

NOTE: The chart below shows the average tolerance difference between ABEC-1, ABEC-3, and ABEC-5.