Easton upgrades M1 mountain bike rear hubs

By James Huang | Wednesday, March 6, 2013 5.14pm

Easton has announced a bearing upgrade for its M1-series rear hubs. It will supposedly boost bearing durability up to ten-fold by reducing play and side loading. Easton currently uses these hubs in its EC90 XC, EA90 XC, EC70 Trail, Haven, Haven Carbon, Havoc, and EA90 XD wheelsets.

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While Easton has changed the bearing size slightly, the key change is the addition of a support sleeve between the two main hub shell bearings, which will eliminate the possibility of excess preload on the inner races. 

The second modification is a new, fixed-position end cap – meaning users will no longer be able to adjust the bearing preload but won't be able to get it wrong, either, or find it working itself loose mid-ride.

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New wheelsets have already been shipping with the revamped design as of mid-February, with updated-spec boxes marked with a green dot next to the item label. Current M1 hub owners will be offered a retrofit kit free of charge, which will also include new bearings. Affected hubs will be marked directly on the shell with 'M1-121', 'M1-221', or 'M1-321' labels.

Watch the video below to find out how to install an M1 bearing spacer upgrade:

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Affected owners should contact wheelinfo@eastonbellsports.com to request an upgrade kit. For more information see the Easton website.

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