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@JonoMarshall
A light 700c rim versus a heavy 26" rim will mean more acceleration (and less momentum) for the 700c wheel compared to the 26" (this goes against the norm as 26" rims normally have this property due to the small diameter).
Weight distribution: Too much weight on the rear and there isn't enough downward force on the front to find grip or "confidence". (Think oversteer/understeer in a front/rear engined vehicles.) Most polo rigs put too much weight behind a turn which is not good for grip (skids/wobbles versus smooth turns across the profile of your tyres).