It would also help if we knew what sort of bike. I take it from the 2.50 front that it's a small capacity bike.
If it's classic or vintage, you want to look for aloy flanged rims to keep it looking period.
When ordering rims, you need to tell the supplier the size of the hubs as the angle that the holes are drilled through the rim are different for different sizes of hub.
Lots of people buy second hand rims thinking, because the rim has the right amount of spoke holes they will fit their hub. A rim designed to fit an 8 inch drum brake will be wrong for a 6 inch hub and way out for a small disc braked bobbin.
Give us more details.
Sam.