Light(ish)weight Pompetamine

Many hydraulic disc brakes are on offer at CRC at the moment, see if you can get some high-end Shimanos.

Good spot Emyr - many thanks. I have no experience of Avid's - does anyone have a view on them? My Shimano SLX's have always been good, but Avid's seem to offer a bit less weight for the £. I suspect Shimano XT will still be outside my price range.

Get a SRAM S300 1.1

I still think Stans Iron Cross on Hope Pro 2 are worth the extra £80, also about 200g lighter than the Kinesis wheels

Get something smaller than the 40c, they don't fit a Pompetamine. Marathon Racers are cheaper and faster rolling. Neither is really much fun if you're likely to see any mud

Get a Wipperman 7Z1

You'll need some kind of sprocket, the Trialtech ones are nice as are the On-One Groove Armada, and On-One come in nice big sizes to go with your 48t ring.

MDCC_Tester - thanks as ever. Will look into those wheels in particular, as I'm having trouble sourcing the Kinesis wheels. Is that a custom build? Presume you're talking about the Hope Pro 2 Evo - the single speed one? Was planning on just using standard cyclocross wheels and using spacers, but this looks like a better option. Do you have a view on whether it's ok to use skewers on an SS or do I need bolts? Also, any views on the prebuilt Hope Hoops if I can't stretch to custom builds?

Tyres were really a bit of a guess. Use will be almost exclusively road, so your choice looks spot on. I just need something that rides well, but is sturdier than the 23c's I've been using on my road bikes. Will run 32c's on this bike most likely.

Totally missed the sprocket. Will check out the Trialtechs and On-Ones. Was intending to go 46 / 18 for starters, maybe drop to a 16 on the back later. Thanks for the chain recommendation - happy to defer to your undoubtedly better judgement.

Great to finally have things underway ...

Jules