I bought my wife a new bike and she said It is "slipping". I took it for a ride and sure enough, it feels like it is slipping just a tad on every rotation.

Its not an in-between gear or tooth slip. It feels like the pedal crank slips a 10th of a turn on every rotation.

Any ideas where to start looking? It is a mountain bike with 18 gears, and has only been ridden for less than a 1/2 mile (800 metres).

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    This is a warranty issue since its brand new from a shop. Take it back and politely insist its fixed. – Criggie Jul 11 '18 at 4:25
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    Otherwise, hang the bike up from some ropes and see if you can replicate the slip while looking at the drive train directly. Might be difficult to replicate cos there is no load on the rear tyre. Mind the fingers! – Criggie Jul 11 '18 at 4:27
  • My first thought would not be the chain slipping, but a crank being loose: It's connected to the rotation of the cranks/chain-wheel, so it cannot be either the chain or the cassette. The only thing that I can imagine that fits your symptoms is the crank moving slightly, innoticeably during the power turn, and then suddenly moving back as you reapply power on the next turn. – cmaster Jul 11 '18 at 9:12
  • Or that the rear mech is not adjusted properly-since it is a new bike the shift cables stretch a bit. – user37640 Jul 11 '18 at 9:21
  • "Any ideas where to start looking?" Absolutely take it back to the shop, unless there's something that makes that very inconvenient. And please post an answer telling us what the issue was! :-) Welcome to Stack Exchange. – David Richerby Jul 11 '18 at 11:35

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