nhluhr

Well, at least we got you down from "99.99%" to just "huge majority". I'm not a programmer but I use a variety of programs daily that stress my computer pretty hard and I definitely appreciate when I'm using one of my faster two machines vs a slow older one (read: 3 years old) at the office.

KiddSisko

Not all, just the 41, where nothing is ever resolved, and common sense reality is but an ephemeral ideal.

My eyes are officially glazed over.

StanSeven

You need to look at the average time trial pace over the years instead of overall average speed. The majority of time is spent in a pack for any rider.

WhyFi

You're still wrong, but I agree - you should get past it.

gus6464

Who would of thought that a BF thread would be the one to remind me that the yearly PC upgrade is coming up.

AdelaaR

win :d

WhyFi

Waiting to see some of the Bulldozer products when they come out, but I'm close, too.

pgjackson

Don't know that TdF averages on TT, but I read an article recently about guys in the 1930's averaging about 25mph...on iron bikes. I just did 22 miles today and averaged a personal best 20.2mph.

Val23708

Same... Battlefield 3 is making the itch worse.. But I think I can hold out til Bulldozer/SB-E/IB

gus6464

I am not sure if I want to hold out until The Old Republic since Bulldozer will be out by then. It's the only reason I have the upgrade itch this year.

canyoneagle

Also, if you look at the records through the years for the "hour", total distance has gone from something in the high 30's/low 40's (kilometers) to Chris Boardman's (still standing) record of 56 ish in 1996. Interestingly, the bikes through the years appear to have a relatively small variation of 1-2 kg in weight, which indicates that rider fitness and technique (including aerodynamic positioning and bike) have more to do with the average TT speed than weight. The hours are an interesting barometer for this, because the conditions are similar - track, individual rider, no hills - so many variables are removed from the mix.

Obviously, this is pretty specific - single speed bicycle on a flat track - so may not speak to the "real world" aspects that come into play where weight may have some influence, namely hills and sprints.

Disco Stu

what rim and tire combination has a one pound (+) total difference?

AdelaaR

A cheap set will easily weigh a pound more than a pro set.

AdelaaR

Exactly.
The hour record has next to nothing to do with the weight of the bike.
Unless you are racing or doing extreme mountains weight is negligible.

cyclezen

there are plenty of wheelsets, like the Mavic Aksium, at 1900 to 2000g, without rubber
1 lb = 453 g
and plenty of wheelsets, like an Easton EA90, which are 1500g or well under...
and that's not even considerin the rubber...
not all are that expensive...

check weight weenies...

KBentley57

From a physics standpoint, rotating mass will matter much more than the weight of the frame. Lowering the weight of the frame by a half pound wouldn't even come close to making the same difference as shaving a quarter pound from the wheels.

urbanknight

My Kinlin/AC/Revolution wheels with Open Corsa rubber weigh more than 2 pounds less than my bike's stock CXP22/Specialized/14g wheels with wire bead tires... and that's not even delving into the world of carbon rims or low spoke counts.

urbanknight

That theory has been debunked many times on this forum and elsewhere. Although rotating mass does exist, the effect it has on a bicycle wheel is so small, it couldn't be measured.

MNX1024

All I can tell you guys is that my personal experience is the lighter my bike is, more water I can hold

Same here, but it also reminded me that I used my PC upgrade money for weight weenifying my bike.
There goes my dream of owning a revodrive and doing some more modification to my water cooling system....

StevenAkaProek

The the top guys avg around 30mph on TT

and the group TT is around 35mph

Team Discovery holds the record @ 35.6 MPH

Val23708

While the numbers might looks small, the effect on the way a bike feels is not dismissable

urbanknight

Placebo. I'm not saying it doesn't make any effect at all, but anyone who claims to notice it on their butt dyno should have a pea placed under their mattress.

gregf83 

How many people actually do an apples to apples comparison of the effect of an extra pound of weight applied to the rims vs the bike frame?

Usually, when people notice a difference in wheel weights it is from a parking lot test accelerating from 0 to 20MPH. In a real world scenario, like starting a sprint at 30MPH, the difference is negligible.

WhyFi

Every debunking that I've seen about rotating mass has been with regard to acceleration, but I still wonder about flywheel/gyro effect on handling. What little looking I've done seems to indicate that rotating mass does affect the wheels ability/'desire' to stay upright. I think that this accounts for that difference in feel that people often note.

urbanknight

Good point. That actually made me think.