I'm building up a bike (x-small BFe) for my 13 year old son. He's a good, nerves of steel downhiller, who does decent jumps and goes very fast - unlike his feeble, chicken, XC dad. He's only light so I'm looking for air forks (revs or pikes) to save having to faff around with different coil weights.
I appreciate the arguments about a 15 or 20mm axle being stiffer, but does it *really* make that much difference, especially for someone who weighs less than 50kg? If anything I'm more convinced by the sense of security of having the wheel really solidly attached, but never having had a QR come loose is that actually an issue or is it just dad neurosis?