I use Rhino 5 with an add-on called Scan & solve to do the stress analysis - its not the best tool out there but it is dead easy to use.
With the bearing, you might be better off to use a double row ball bearing rather than a single tapered roller bearing. Rollers are generally used in pairs as they only resist sideways forces in one direction and they need tensioning to stay together. A 3204 double ball bearing has more than twice the radial load capacity than the same sized roller bearing and is 20.6mm wide - a good match to your disk. A pair of roller bearings are about 30.5mm wide, which will make the hub design difficult & bulky. Get bearings with metal shields rather than plastic seals as they have less friction and run cooler at high speeds.
What sort of RPM are you planning for the disk? At 10,000 RPM and a 10 KMH forward speed, the disk will get a 16.67 mm deep bite and since most impacts happen at relatively slower speeds, a tooth depth of around 16mm should be more than enough. A smaller tooth will be stronger and lets you add weight, never a bad thing. Since the disk is fairly light and a smaller diameter, your best option for big impacts it a really high RPM; the kinetic energy increases with the square of the speed, so even a modest increase in the RPM can really improve performance.
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