Hi Briz,
Had a look at my SKF catalogue, surprising!!!
The 60 x 78 x 10 you're looking at, ball bearing ref 61812, is rated at 9000 rpm, good for 8710 Newton dynamic.
I use usually the 25 x 52 x 15 ball bearing ref 6205 in me H-D cranks, that's rated 12000rpm and 14000 Newton dynamic, so the load doesn't increase necesserally with the size...
I also use, same place, a single lip roller bearing, same dimms, 25 x 52 x 15 ref N205, that is 11000rpm and 16800 Newton dynamic.
You would have to go for a 60 x 95 x 11 ball bearing, ref 16012, to get to 19900 Newton dynamic but revs fall to 8000rpm...
That's for open bearings. If you add oil seals, the speed goes down again...
Patrick