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Originally Posted by visionary
Looking for ideas
On other “linked system” motorcycles, what front rear split is employed?
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Honda uses 3-piston calipers, at the ratio of 2 Front to 1 Rear pistons in their DCBS when the front brake is applied - this reverses when the rear brake is applied.
Applying both brakes operates all pistons on both ends.
All that is off course with the rear brake being a smaller, single disk as opposed to the big dual front disks.
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Am I being too “fussy” for a 90cc vehicle?
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Not if it's going to go fast due to streamlining.
It'll need good brakes - but not so good that you'd easily lock them up.
The CBR's twin brakes are going to be overpowering the front tyre anyway - regardless of the static weight distribution and dynamic redistribution.
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do you have any suggestions?
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Single CBR rotor fore and aft ?
You'd already have most of the hardware (splitters etc) while it remains a simple 2-disk system.
The volume in the regular CBR front brake cylinder would be sufficient to operate both disks.
Use braided brake lines to offset an increase in brake line length - you don't want to use soft, swelling rubber brake lines over long distance.
More braking power at the rear.
Reduced braking power up front - I doubt you'd need a braking system designed for 150+ mph ?
Another approach :
Calculate the energy the brakes need to be able to dissipate using Vmax and max. weight for your vehicle, compare that to the value for the CBR, and see how much of its braking power you'd need.
Something else to calculate and guestimate :
Weight on the front fork.
Make sure you don't put much more weight on the CBR front forks than the CBR+rider normally does - you'd risk bottoming out the springs under braking which leads to easier lock-ups.
If the vehicle turns out to weigh more than the stock parts were designed to handle, you'd need to improve the suspension components.