• Cartridge bearings are failing all the time on all wheels that use them, that's why shimano never uses them. I have been riding my cone bearings hubs for two years with just a clean up once in a while, zero failures

    rims are made as good as name brand rims (material and build quality), just because they don't have a recognised brand name, doesn't make them any worse

    spot welding is where you place melted material in gaps between two parts to in a sense, 'glue' them together preventing the steel chainring from just turning round and round on the aluminium crank arms. It's cheap way to do it, but it's effective for the most part. Not as nice as a cold forged crank with chainring bolts for the chainring, but cheap cranks are cheap cranks

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