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The X stands for the ‘Double X Bridge Shaping’, which uses grooves on the external plates to assist guiding the chain as it passes up and down the cassette.Before using the X10-EL I thought the slotted inner and outer plates would accumulate more road grit and gunk but that has not been the case.
Another characteristic of EPT: The very smooth surface gives chains excellent running qualities. Dirt buildup is minimized in the long term, which means that chain maintenance is significantly relieved.The granting of a best price is not combinable with other promotions (e.g. "free articles) from Bike-Discount. Enhanced Durability: With unique SP (stretch-proof) treatment, the durability has been effectively enhanced by reducing the attrition between inner plates and pin. As a result, chain life has been significantly prolonged. Wax based lubricants accumulate less road grit than traditional oil based chain lubes, so there is much less wear of chain pins and inner plates, hence slower elongation rate. My regimen is to remove chain and cassette from bike every 1000-1200km and clean chain and cassette with solvent.