Installation of rear mech

Hi guys
Bought a new rear mech received it today (after mine destroyed itself) set the limits eveything was fine until i shifted into the smallest cogs front & rear, the chain just seems to be very slack and jumps (i m not actually suprised its so slack). Thing is i cant work out how to stop it doing this any tips ? my chain & cassette are not worn & the chain is the the correct lenght when in the largest gears.
matt
Bought a new rear mech received it today (after mine destroyed itself) set the limits eveything was fine until i shifted into the smallest cogs front & rear, the chain just seems to be very slack and jumps (i m not actually suprised its so slack). Thing is i cant work out how to stop it doing this any tips ? my chain & cassette are not worn & the chain is the the correct lenght when in the largest gears.
matt
Show me your green bits i might buy them !
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but it is not a ratio you will ever use.
Parktools :?:SheldonBrown
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Parktools :?:SheldonBrown