That Might just be displacement – like if a lorry drives past you, theoretically there shouldn't be a downdraft, as the wing is being pulled upwards by the less dense air, as you said buoyancy – or where you stating that there is no downdraft? In which case i agree.

Back to the original topic and a thread on tubeless tyres was bound to throw up a gem…

Running kevlar beaded tyres makes the tyre less sturdy in hard cornering and more likely to come off is you get landing squint etc.

Yes! Kevlar stretches!

So does wire 😉

intense 5.5 crack all the time I read it on the internerd, David taylorford strikes again

Apparently there is a Sanderson bike frame that both costs £550 and weighs 5.5lb. 😉

Who on earth would buy one of those?

seen it on the scales!

I’m sure you’ve seen a sanderson weigh 5.5lb on the scales. My medium gas-pipe one most likely does. I expect a 20″ is a bit more as well.

So: heavy ones @5.5lbs, rrp £300-350
853 ones, max rrp £500. about 0.2-0.3 lbs lighter whatever the inaccuracies in the website blurb.
Don’t see any for £550 at all.
Perhaps you should shop around a bit Al.