With the stock spur whatever size that is! (for B4 or Cyber) I don't tend to change spurs unless the stock one can't manage the gearing range I need (ie my D4 runs a stock spur, the B4 did, but my RC10T has a much larger spur as its stock gearing wasn't suitable for brushless)
5700 should be pretty close to the 6000(5.5t) in performance. I'd suspect a touch slower at max speed, but a touch faster acceleration. You could probably run the 5700 one tooth higher (19tooth) if you wanted.
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Yz4 - Yz2
DEX210 - Cobra 4210- DEX410
RC10 Team - Manta Ray - RC10T
Mini Trophy - Blizzard - Wheely King
Tz4 - GT24B
BMRCC
Emergency back-up race controller
(but only if nobody better is available)
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