Top quality RHP left (primary) side crankshaft roller bearing as fitted to Triumph 650 1966-72 & 750 1973-76 unit twins and 1966-1972 BSA A50 & A65 unit twins in CN (clearance normal) clearance.
CN bearings are tighter than C3 and not as tight as C2. These were standard in BSA unit applications as well as many Triumph 750s. Triumph 650 twins generally were fitted with CN clearance, and to add to the confusion late T140s were fitted with C2 clearance bearings.
Always check the clearance specs for your make and model to prevent damage. Bottom line is that after 40+ years of wear and tear many engines now need different clearance bearings than they originally came with.
Crankshaft Roller Bearings in Other Conditions:
For this bearing in C3 condition click here.
For this bearing in C2 condition click here.
Other Bearings
For the ball bearing companion to this bearing click here.
Useful Tools
If you’re looking to remove the race, use the race removal tool to get the job done.
Please note: Due the nature of the product, we unfortunately do not accept returns on bearings, service tools or electrical components. Please be confident about your purchase before ordering. If you have questions, please contact us.
Additional items to consider:
- Triumph 500 650 750 Twins Triples Main Bearing RHP MJ 1 1/8″ CN PN# 70-1591 CN
- Triumph BSA 650 750 Driveside Main Roller Bearing Hepolite MRJA 1-1/8 C3 PN# 70-2879C3 H
- Triumph 650 750 5 Speed High Gear Needle Roller Bearing (1) Koyo US Made PN# 60-3511 D3511
- Triumph T140 TR7 750 Bonneville Tiger Sealed Wheel Bearing Disc Brake (1) PN# 57-1070 T
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