Disc Brake Rotors & Spares

No. There are two different fitting mounts, 6 bolt and Centrelock - these fit 6 bolt or centrelock wheels. Rotors also differ in size from 140mm to 200mm in diameter. Most road and gravel bikes use 140 or 160mm rotors. Mountain bikes have 160 - 200mm rotors.

No. Post mount fitting is used for mountain bikes and was used on gravel and cyclocross bikes a few years ago. Flat mount is now the fitting standard for gravel, road and hybrid bikes. The main difference between the two fitting mount types is that flat mount is more aesthetically pleasing and less bluky - ideal for neater, more minimalist road and gravel bike applications.

Firstly, check brake manufacturer & model, disc brake pads differ in size and shape between models. Pads come in three types; Sintered, Organic and Semi-Metal.

Sintered Pads last the longest, but take a while to bed-in and can be noisy.

Organic Pads are quick to bed-in, less noisy, but can glaze over and don't last as long as sintered.

Semi-Metal Pads combine the best elements of sintered and organic, they can glaze over and are more expensive.

Yes, it is more cost effective to buy a full groupset rather than individual components. Buying a groupset from Merlin allows component options too (providing stock is available), so it is also easier to get exactly what you would like.