i have giant kronos gs and its taking a beating , fist two cogs snapped off i have had only 5 gears since , not so bad , but id like to get my full speed back . im looking around found some exact replacements for cheap but , i need some help , does anyone know what would be better even its 8 or nine cog systems as long as they fit on the wheel and preform better than the original i will be happy , if you know of any cassettes that would work plz le me know in a reply ... try to keep it under 30 bucks i paid 60 for the bike and it daily abuser bike .