No they dont require your to extend the rollbar and my helmet does sit slightly higher than the bar. I should order a BK one really.
The brakes need the GT3 hubs which means you need new wheels or spacers. That was my issue on the day, my track wheels were the wrong offset and I left it too late to get spacers. I have now decided to get another set of track only wheels made up with the right offset.
They are worth the hassle (IMHO).
Cheers
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