What pads are compatible? I have Tektro R320 Calliper brakes on my bike: < It's time for some new pads. However, the ones on this appear to be all in one, bolt straight into the pad on the calliper. If I look on wiggle, my usual online component supplier, there are lots of blocks for cartridges, or blocks like this: < But not so many options that look like what is in the Tektro OEM. How do I know what I can fit? what's compatible?

They look like standard Shimano-type cartridge brakes. ~~No need for new blocks, just get a set of pads.~~ I recently got these and they are really good - far better than the standard shimano ones: <

Go for the salmon if you have non-carbon rims.

EDIT: I seems your brakes do not in fact have cartridges but the brake pad is a single piece that connects directly to the caliper arm. The dura-style cartridges (like the ones you linked to) will fit on your calipers and is a worthwhile upgrade. You will be able to more cheaply and easily replace pads and have a wider choice.