Actually just over £400, I forgot to multiply spokes by 2.
Hubs £118
Rims £166
Spokes £100
Probably about £40 to make an axle and spacers to convert the disc hub for rear use.
Might it be cheaper to buy a pair of light road wheels and swap the rear hub for the one suggested?
Might it be cheaper to buy a pair of light road wheels and swap the rear hub for the one suggested?