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-   -   how important is weight (http://www.bikeforums.net/track-cycling-velodrome-racing-training-area/491432-how-important-weight.html)

fogrider 12-03-08 02:22 AM

how important is weight
 
for a track bike. since there are no hills to climb, shouldn't the stiffness that really matters? I know its really cool to have a light bike but is it really faster on the track?

classic1 12-03-08 06:45 AM

Quote:

I know its really cool to have a light bike but is it really faster on the track?

No.

andre nickatina 12-03-08 02:18 PM

Faster maybe on initial acceleration, after that aerodynamics and stiffness trump weight.

fogrider 12-03-08 03:49 PM

Quote:

Originally Posted by andre nickatina (Post 7957704)
Faster maybe on initial acceleration, after that aerodynamics and stiffness trump weight.

isn't that what its all about on the track? fast acceleration in the last 200 to the line?

andre nickatina 12-03-08 04:02 PM

That's a match sprint. And no, you're already up to a reasonable speed by then before you go for the all out sprint... if you kilo'd someone on a sprint, weight may make a difference since you're going from standing start to all out. But stiffness and aerodynamics still win out, especially seeing as how close match sprints can be... with people winning by less than half a wheel's length.

Match sprints are one of many events on the track though, but stiffness is probably more important in those and kilos than any other event. Dedicated sprinters are big bruiser types.

woodduck 12-03-08 07:21 PM

Stiffness and being able to get the power down with traction.

So no weight is not as important.

Mavic Comete disc wheel is about 1300g and front IO is about 800 or something. They are the modern standard.

melville 12-04-08 02:56 PM

Quote:

Originally Posted by woodduck (Post 7959616)
Stiffness and being able to get the power down with traction.

So no weight is not as important.

Mavic Comete disc wheel is about 1300g and front IO is about 800 or something. They are the modern standard.

I've found the rigidity thing is more about being able to get the power down with some predictibility in which way the bike is going to go. The engineers I've known tell me that energy lost from flex in a metallic frame is just about immeasurable--that it's all available to you as soon as the frame flexes back.

My track bikes have always been fairly rigid, but my road equipment has quite a range of rigidity, from Vitus 979 to the same tubes as one of my track bikes. They're all as fast as each other when I jump, but the flexible ones demand some attention from me to keep a straight line.

I like having light spoked wheels because I can accelerate quickly and silently in mass start races. Discs tend to make a lot of noise, and I'm slow enough to require stealth to make my moves stick.

That said, people under six feet tall can probably get a bike as rigid as they want within the UCI minimum weight requirements, which are the same for road and track bikes as I understand it. 16 lbs?

zzzwillzzz 12-04-08 04:17 PM

+1

that's what i've been trying to convey to people. just like racing a car or motorcycle, a more flexible frame/chassis is more difficult to control, that's what makes it slower not a loss of energy, just the ability to use/apply the available power

woodduck 12-04-08 09:56 PM

yeah a bit of flex helps nearly every single rider out there, no one is that perfect at pedalling. Some give is sometimes better than less.

I am 196cm and weight 103kg and favorite event is the kilo, I have no real problem flexing most equipment.

I like a stiff headtube, really can't stand getting shimmy shimmy from the bars if your coming down the banking ina match sprint or something.

The new dolan is meant to be very stiff and light. Don't know and probably never will as I doubt they will make one large enough for me to ever ride. but the BT does, it's heavy, stiff and a proven product.

fogrider 12-10-08 01:28 AM

the worst for me is a flexy stem!


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