power to weight ratio

[Bike Mob]

 

weight limit is 6.8kg... actually listed as 15lb or 6.818

 

Buy the best bike you can afford. then use it to lose weight on your body. then start counting grams on the bike.

Tarmac-GSTR2010-02-22 09:53:44

[Guest Agteros]

At the end of the day we all a bunch a rookies anyway?

Buy the lightest that you can afford' date=' and that makes sense given the amount of riding you do. Shimano 105 is the same as Dura Ace, just abit heavier.

Case closed.[/quote']

 

Cheapest you can get!

I ride a 2005 Scott Speedster S6 with Sora and a triple crankset and I am going to start in the B bunch on Sunday (used to be C-F previously). Bike is supposed to weight about 10kg. Paid R2K for it. I reckon the bike and equipment is good enough for the A bunch...

 

Heavy bikes provide more training opportunities and general fitness and fun is why most of us ride our bicycles, not to get onto the podium or make of career out of sport.

[29pgc10]

But bragging rights' date=' that's the thing!

That and the satisfaction of having a bike similar to a pro's bike.[/quote']

 ... And the last thing I want to bie is a weight weene.

 

 

 

few pros (at last on road) race with 'super light' components, rather with what is sponsored for their team.

 

what is wrong with being weight weenie? it is much easier to loose of a bike than from the boep (), at last I dont have to sacrify my steaks, pregos, beer, comfy car etc.

 

also the placebo effect of exotic componets is worth dosens of holograms!

[SURFER]

get a 6.8 kg bike.  There is always enough reasons for not being good enough, but there is no excuse for not looking like a pro

[GreyOwl3.0]

I usually have to 'wait' for my power to kick in...

[thysmeades]

 

P = w/t
so then lets assume a perfect enviroment etc for both instances
many variables not taken into account
senario 1
bike 8kg's
rider 70kgs
vertical ascent 200meters
time 300 seconds
w = f x d
work done = (70+8)9.8 x 200 = 152880 J
P = w / t
power  = 152880 / 300 = 509.6 watts
senario 2 (we reduce the weight of the bike to 6.5kgs)
bike 6.5kg's
rider 70kgs
vertical ascent 200meters
time 300 seconds
w = f x d
work done = (70+6.5)9.8 x 200 = 149940 J
P = w / t
power  = 149940 / 300 = 499.8 watts
OR we can say that you reqire 2% less energy expediture to achieve the same time up the hill

[thenoodle]

I failed Russian at school, have you got the english version?

[thysmeades]

ha ha, the basic story is, if your combined body and bike weight is lighter, you will use less energy getting up the hills OR use the same energy as before and get up the hills faster.forum_images/post_button_smiley.gif

[Harry Potter]

P = w/t
so then lets assume a perfect enviroment etc for both instances
many variables not taken into account
senario 1
bike 8kg's
rider 70kgs
vertical ascent 200meters
time 300 seconds
w = f x d
work done = (70+8)9.8 x 200 = 152880 J
P = w / t
power  = 152880 / 300 = 509.6 watts
senario 2 (we reduce the weight of the bike to 6.5kgs)
bike 6.5kg's
rider 70kgs
vertical ascent 200meters
time 300 seconds
w = f x d
work done = (70+6.5)9.8 x 200 = 149940 J
P = w / t
power  = 149940 / 300 = 499.8 watts
OR we can say that you reqire 2% less energy expediture to achieve the same time up the hill

 

Thanx this is the answer I was looking for.

[Minion]

Have a look at this site"

http://www.analyticcycling.com/WheelsClimb_Page.html

 

It has a nifty calculator where you can experiment with the effect of all sorts of variables.

 

[HappyMartin]

A lot depends on where the weight is. Extra weight on things like pedals and wheels has a greater impact than for example extra weight on the bars. An extra 5 kg on the belly is bad but and extra 5 kg of lean muscle mass can be pretty good.

[thysmeades]

yip, weight on the wheels is the worst. biggest upgrade would be lighter wheels, not only gravity weight, but inertia to get rotational speed up as well, that's why light wheels are a super upgrade.

[pbrizzolari]

I don't ride road, but I can tell you that regardless of whether you're a pro or not, having a 2kg lighter bike helps stacks offroad. It's easier to throw around, goes over rocks with less problems and flies up the hills.

 

 

 

I may never be pro, but I wouldn't go back to a heavier bike willingly.