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From manufacturer's official website:
The teeth of the Record™ sprocket set have an Ultra Drive™ design that integrates the chain and chainwheels of the crankset to ensure fast, precise and consistent shifting through the years.
Ultra·Drive™ - nickel-chromed finish for steel sprockets - light alloy carrier - supplied without lockring (except for 11-21, 11-23 and 11-25)
This 13-29 cassette must be used with a Record 10-speed medium cage rear derailleur.
For more information, please visit this product's webpage.
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