Aerodynamics / Aerodynamic Cost / Aero parts

Anyone got a small / XS skinsuit they wanna lend me for Saturday...? My Chinese one doesn't look like it's gonna get here.

20c Conti Supersonic meant to work well...

hahahaha

Proper tyres only please.

20s? umadbro?

Narrow is fast, not that you'd know anything about that, fatty.

Lots of testing types running 24c Turbo Cottons on deep/wide wheels, maybe those aero bumps do actually do something.

Narrow is fast but everything is going wide... because everyone know wider is better... that's why I get all the laydeez...

I run 24c turbo cottons or 23c Open Corsa now.

There's plenty of people running narrow tyres on wide rims... got a 22c on the Flo at the moment, a 20c Supersonic comes up nicely too.

Also, are you selling the Stealth?

http://www.ebay.co.uk/itm/Planet-x-Stealth-pro-TT-bike-/322063213945?hash=item4afc76a579:g:qHwAAOSwsN9XApbm

Is that a 20c? I expected it to 'look' skinnier on the rim.

Ha! No.

Shit, that's even uglier than mine. I didn't think that was possible.

I think that's the 22.

Yeah, that's a 22. But a 20c does come up well.

Arent those fancey spesh tyres to fastest Things around.

Kinda fancied getting some spesh tubs. But they work out too pricey.

Depends who's pedalling them round.

I think tyre/rim aeros are just one of those things where there's too many variables, you just need to test.

You need a black TriRig.

White >>>>

Cheers, I'll PM you my address for delivery.

They're pretty quick. I think Conti clinchers are still faster in Crr terms but I don't know what will be faster stuck on an 808FC when it's about Aero and (t)rolling resistance.

I just sold one of mine and one of the OG Shiv calipers.

The new TriRig Alpha X bars are available now apparently. They were what I wanted about a year ago it seems. But I've since got TriRig Alphas and a PRO Missile stem so I don't know if I can be arsed throwing more money at my setup. May as well just buy a new bike.

I use my aero Wheels for road racing, tris, and TT. So wouldnt want to og too small.

My rims are 28mm at the widest point. But have a pretty poor rim-tub Interface With 25s. I reckon 22 would be the sweetspot. Maybe even smaller. Cant imagine it make much of a difference on the rear though, so I stick to 25mm there.

Yeah, CdA on front, Crr on rear.

But being too concerned about RR aeros unless you're Sagan >>>>

fecking pain to get in Norway (at least now the kroner has collapsed).

Norway Noway!

You need a black TriRig.

Either an old one or new one plus a hanger. The OmegaX with integral cable stop doesn't fit a T3 properly

Yeah, the OmegaX looks shit on a classic P3. Shame, as it's meant to be quite an improvement.

The chap in the Tyres thread talking about putting a cheap tub on an old disc had me thinking: Has there been many/any improvements in disc aerodynamics over the last decade?

I'm using a cheap old HED track disc, shod with an expensive tyre for this TT season.
Apart from slightly better aero, crr and stability from a wider track, what can be improved?

I can't comment too much on aero improvements because that's not my area of expertise. I was always under the impression that narrow was better because of the function of cross sectional area but, as the others have said, once you take into account a slight side wind you get a sail effect. You can make a better wing section with a slightly wider wheel - plus a wider wheel takes better advantage of the structural properties of carbon.

Structurally I think is where discs have come on quite a long way. I've got an old road HED too. Slightly lenticular. I'm not sure it is actually carbon - I think it might be glass fibres in a black resin and it's a kind of sandwich structure. Looks like a basic 0-90 degree weave. Bonded onto the alloy rim.

Modern wheels (like the Comete) look like they are typically made with pre-preg panels of unidirectional fibres running radially. It is much more efficient doing it this way: it is much stronger, stiffer and so can be made lighter. Those Lightweight discs are made a different way. They look like they are UD carbon tape 'spokes' bonded onto a foam core and skinned. The conical sides make the stiffest wheel for the least material, like a conventional spoke works. I think the new Ghibli wheels also have some kind of spoked structure inside to make it really stiff and a thin lenticular surface over the top. The HED really is an inefficient use of material in comparison and that is why it's so heavy.