servo makes a massive difference!
You know when you get a little out of shape in a slide, but you can;t quite react quick enough to catch the slide before you spin etc? Well with a fast servo you can catch the slide much easier.
Also on fast sweeping bends, the standard servos don;t have a lot of power to keep the wheels turned under the load on the tyres. With a fast/strong servo, the keep the wheels locked on full turn.
you can pick up decent spec second hand KO servo's with metal gears for around £30, well worth the investment if you plan to race regulary
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