Originally Posted by
Kopsis
This is semi-accurate. It has nothing to do with the speed of transmitting the data, it's the performance of the magnetic reed switches they use in the sensors.
However, OP wasn't asking about a road bike mounted on a trainer, he was asking about a spin bike. A spin bike flywheel is on the order of 2 ft diameter and weighs about 45 lbs. A standard cycle computer will work just fine.
Actually, this is correct and my original post was incorrect - sort of. In theory it is possible to mount a sensor on a flywheel of a trainer. But the flywheel will not rotate at the same RPM as the wheel - so that has to be compensated for and a different wheen size must be input into the computer. It all depends on the range of input the computer will accept and the size of the flywheel....probably not likely but I'd have to do some math and look at the specs on a computer.
With a spin bike the driven flywheel is the same (I presume based on the appearance of them) as the rear wheel and most likely will be within the input range on the computer.