There are hundreds of wheels out there, different colours, shapes, sizes and durometers.
What is the Durometer!?!
Basically it is a number given to the wheel to describe it's hardness or softness, the higher the durometer the harder the wheel, the lower the durometer or "Duro" the softer the wheel.
"Have a look at the graph below for an example, keeping in mind these are not the only Durometers availible on the market"
The choice of wheel is a matter of personal preference, luges tend to use much softer wheels than other recreational devices that use trucks, usually anywhere from 75a upwards.
SHAPE AND SIZE
The size of the wheel can vary also, whilst in Buttboard or Classic luge, the wheel size is restricted to 70mm tall, in the Streetluge class pretty much any size skate wheel may be used.
The more common sizes range from 75mm upto 90mm
The shape of the wheel can play a big part in how your luge handles, a square lip edge can provide more grip in the corners, whilst a rounded edge will allow for more sliding.
There are loads of diffrent wheel shapes out there that all have varying effects.
The most commenly used are ABEC11 FLYWHEELS, SEISMIC Speedvents and LANDYACHTZ Hawgs.......in all there are too many to list, the best way is to try them and form your own opinion based on your preferred riding style.