Not my dieting but the next trike's. Two wheels at almost opposite ends of the lard spectrum but both nominally 20" wheels although you'd hardly believe that from their size difference. A pair of the fatties with 203mm rotors and 20mm axles cripples the scales at a hefty 9.24kg. A pair of the skinnies with lightweight road tyres, lightweight 160mm rotors and 12mm axles floats away at 2.7kg. I'll be sticking these orange Kate Moss-a-likes on the epod-a-like I start after finishing the current porker. There's nothing exotic about the weight saving - no carbon fibre, no titanium axle bolts, the hubs were £15 each, the rotors were just £2 more than the cheapest and the tyres were £17 a pair. It wouldn't be overly hard to find lighter ones though savings beyond this will likely be very small for many £££s.