My name’s Louis.
I race a Kosmic Mercury S in Australia (rear brake, IAME X30 w/ exhaust restrictor, medium compound tyres), and I’m hoping you could help me decide if a bigger brake disc is really better.
Australian-delivered senior OTK karts come with a 206mm x 16mm brake disc and six-spoke 50mm carrier, while I’ve noticed European senior karts use a smaller 180mm x 13mm brake disc and three-spoke 50mm carrier - with the same BSD caliper.
Given this, I figure the two discs are interchangeable within the BSD setup. Has anyone by chance weighed the 180mm disc and its 50mm three-spoke carrier? I’d love to know if they are lighter.
I race in Light, which imposes a 162kg minimum weight. I’ve saved weight in the most obvious places (battery, fuel tank and third bearing delete) and come close enough to the minimum that I am focusing on rotational mass - where savings have double the effect.
As well as this, if anyone’s run the 180mm disc in a rear-brake category similar to mine, could you share your experiences on its brake performance in terms of fade, feel and bite?
The 206mm drilled disc with OTK BSD pads offer loads of bite, almost too much.
Pics for reference, a 180mm disc: