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Most karts that come with front brakes are way too stiff for RMC. Better to buy a 30 / 30/32 chassis now and then see if you can grab the stuff needed for front brakes later.
A shifter chassis would be too stiff for a Jr. Rotax (even if it was originally designed for use w/ a 80cc shifter), and I've not hear about RM requiring front brakes. If that was the case this would've been done as the engine and class isn't anything new.
IF FA/FSA don't need fronts, I don't see how a rotax can possibly "require" front brakes.
As for data acquisition; do that in a few years time after your son has some racing under his belt and knows what to do to for chassis adjustments. A lot of times people get too distracted with the "dash" readout and are not concentrating on driving.
An Alfano pro or anything equivalent would be fine. It has split sector times, rpm and water temp along w/ the memory of the highest rpm and temp reached. Our provincial RM champion who happens to be one of our national representatives at the 2005 RMC worlds races W/O any display on his wheel.
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