[Kevan]

On reflection the 9/24 on the Alfa is way too low, brakes are ridiculously strong which tells me the pinion is too small or the spur is too big.  I've changed to 10/24 for tomorrows racing, the car should be smoother and I should have control over the brakes that doesn't exist with 9/24 as it's all-or-nowt.

12/24 with these small diameter tyres may work well.