The IVA test requires a declaration of the maximum design road speed for the vehicle.
I wondered what other builders had done in the past. Have you simply taken the max speed for the donor or is there an alternative. I guess the donor was much more slippery than the sportster but not sure whether that should change the declared max speed.
Or does it not matter what speed you declare so long as it's less than the speed rating of the tyres.......................