Baldy ;)

it's racer-influenced fashion ....

Well, dang ... you just answered most of the questions on bikeforums.net.

Not yet, but I'm working very hard at it...

I like that....

No roadie visor for same reason you don't see them on street bikes - get above about 40 mph and look up and you will find your helmet rotating backwards on your head. Dirt bike helmets - visor yes, just like MTB cousins.

RE the camelbacks, I do seriously wonder if there would be an advantage for TT. Eliminates the bottle drag, and wearing it under the jersey would help maintain laminar flow off your back, again similar to motorcyle RR leathers.

I've heard it's faster to ride with a bottle than without.

couldn't taking up the space inside the triangle help eliminate cavitation/turbulence? I can't assume the speeds dealt with on tt bikes get to the point where that makes a difference...but i also cannot assume the converse.

maybe on a motorcycle, but I haven't seen that on a bike. If I look if i'm going over 40, the helmet stays in place. The visors I've used have way too may holes for this to happen.

I found that putting on a visor helmet backwards keeps the sun off my neck,and gives me maximum airflow to my forehead.

[QUOTE=JayhawKen;10750291]No roadie visor for same reason you don't see them on street bikes - get above about 40 mph and look up and you will find your helmet rotating backwards on your head."

Sorry but this is complete BS,i do use a giro with visor on road and have done plenty of high speed riding down mountains "palomar"and others and never had a problem with helmet moving.

For roadies, wearing a cycling cap, visor flips up AND down. I only turn mine down if I need it to block the sun - like a visor in the car. Plastic mtn bike helmet visors don't flip. You can get in the drops with the cap visor flipped up and it's not in the way. Only problem I've had is in a pace line at high speed in the evening riding into the sun (visor down & head down, in the drops).

Back pack for TT's: Biggest limitation in TT's, aside from aerodynamics, is heat dissipation. Camelbac came out with an under the shirt hydration bottle (hydration jammie top) but I think thermodynamics trumped any aero considerations. In marathon running, it's why you see really small people and really slim tall people win. Surface area controls evaporative cooling and surface area varies with the square while volume (bulk) varies with the cube.

Ok here is a different answer.

I have a time-trial bike and when I ride that bike (or even on my road bike aggressively down in the drops), I am looking quite a bit of the time in my upper visual field. I couldn't wear my MTB helmet with a visor in that position without it blocking some of my vision. Even with my road helmet, I keep shoving in back on my head because the front of the helmet interfers some with my upper visual field. It would be impossible to wear a Mtn helmet with a visor on the TT bike and see well.

Actually the fourth post said pretty much the same thing...

Yeah, but that is because of the thin mountain air...

:p

Plastic visors on some cycling helmets can be flipped up or down or in between.

As to blocking vision in drops... If the sun angle is higher than your sight line angle then a properly adjusted visor can provide more shade on face/glasses without blocking visual sight line any more than just the front edge of the helmet does.

because its extra weight and we dont do that.

Well you live in missouri,so i'm just going to chalk it up to that.

Actually, I ride with a "Mountain bike helmet". I tried it with the visor but didn't like how the air flow pulled on the visor at higher speeds. Personal thing, but I just didn't like it. So I ride with a Bell Aquilla, without the visor.
As was said, mountain shoes have to be flatter so that you can walk through certain terain. I used to ride road bikes with mountain shoes, but stopped late last year when I recognized I'm doing 90% road rides to 10% MTB rides.
They make a Camelback for road riding. It's narrower and smaller than the MTB packs. I tried my MTB Camelback on a road ride. The sweat and heat on your back on a long ride on a hot day is really annoying. I tried a Camelback waste pack. It's not designed for road riders so you have to jury rig the mouthpiece hose to your helmet strap. When it worked it was great, no sweat on the back, and no reaching for a bottle. But more often than not, I had problems with the homemade attachments. If Camelback or some other hydration pack manufacturer comes out with a well designed waste pack for road riders, with the proper attachments, I'll buy it. Meanwhile, I've just become better at reaching down for the water bottle. Having two tall bottles, that take a couple inches off the reach really helped.