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In comparison with cheaper stamped metal chainrings that come inventory on many bikes, the brand new absoluteBLACK Tremendous Metal e-bike chainrings begin as a tougher premium metal block, then get milled right down to separate spiders and chainrings.
From there, they’re warmth handled to extend power, then given a number of “nitriding and carburizing” floor remedies to realize a 1300HV hardness score. They are saying that’s 4x tougher than typical stamped metal chainrings.
Facet notice: absoluteBLACK isn’t the one one providing CNC’d e-bike chainring upgrades. Hope, Rotor, and others provide them, however they’re comprised of aluminum, not metal.
There’s nothing fallacious with aluminum, that’s what aB’s customary chainrings are comprised of, however they are saying the added torque from an e-bike motor can put on stamped (and, presumably, alloy) chainrings extra rapidly. Which then wears the chain, after which the cassette, extra rapidly, too.
So, regardless of these chainrings costing €189.95 and the spider starting from €120 to €140, they are saying it may give you as much as 3x the lifespan on the remainder of your drivetrain. And, cassettes and chains are costly as of late, too. Spider and chainring are bought individually, so you possibly can substitute simply the chainring if/while you do put on it out.
Why so costly? They are saying the block of uncooked materials prices them greater than the retail worth of a typical chainring, and since it’s a lot tougher, it takes considerably extra time to CNC.
The Tremendous Metal e-bike chainrings are available two variations, one optimized for 12spd Shimano HG+ chains, and one for normal 11/12spd common chains.
Spiders can be found for these e-bike motors:
- Shimano Steps (50 and 53mm)
- Bosch Gen 3 (50 and 53mm)
- Bosch Gen 4 (50 and 53mm)
- Specialised Brose
- Specialised SL 1.1 MTB motors
Spiders are available 4 colours: black, purple, gold, and titanium, they usually include titanium chainring bolts.
The chainrings are solely suitable with these spiders, and solely are available a “titanium” colour together with your alternative of 32/34/36/38 tooth counts. Simply be mindful, some e-bike techniques are optimized for the inventory tooth depend chainrings, so double verify with the producer earlier than altering chainring dimension.
