The size of the rim will change the track modifying the rolling of the kart. However narrowing the Rims also change the shape of the tyre, it has also an impact but I am not sure what: less air so tyre heating quicker? When you have drying track and you are not to sure about if it is time to put the slick on, is it an option to put slick on 120/180 rims or to put wet on 130/210 as a compromise?
Material of rims I think is actually very important. The more Ally you have in the rim the quicker it will heat and reach the sweep spot, very good when you just put the slick on a drying track. The problem with Ally is that the tyres carry on heating and you pass very quickly the sweep spot, so very bad in dry and especially in hot weather. When dry on hot you want full mag as it is dissipate well the heat and you will keep your tyres around the sweep spot most of the laps - hence consistency.
What I would love is to get a guideline along these lines: 1. Dry 10+ degrees Celsius ==> Full mag - Slick 10- degrees Celsius ==> Half mag - Slick
2. Damp 20+ degrees Celsius ==> Half mag - Slick 10-20 Ally 130/210 - Slick 10- Ally 120/180 - Slick
3. Wet 20+ degrees Celsius ==> Ally 130/210 - Wet 20- Ally 120/180 - Wet
2. Very WET ==> Ally 120/170 - Wet
I realise there are lots of other parameters, e.g. track layout for example at Larkhall it is turning all the time to you put lots of heat in your tyres at Shennington lot of straight so you need more heat. But having an idea would help.
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