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-   -   stock bike weight variability? (http://www.bikeforums.net/general-cycling-discussion/885799-stock-bike-weight-variability.html)

spectastic 04-23-13 09:14 PM

stock bike weight variability?
 
My good bike is a windsor knight, with ultegra shifters and derailleurs. I did a search on what its weight is supposed to be, and got it to be somewhere between 19 and 20, no more than 21 lbs. I weighed it just now on my electronic scale, taking the difference between me and me+bike, to get 23.6 lbs! This is with just the bike, water bottle cage, bike computer, and shimano m530 pedals... The pedals together weigh ~1lbs, but everything else shouldn't weigh much at all. It's not too big of a deal, because it was a cheap bike from bikesdirect. but I'm guessing this is not normal. Is it a quality control issue? did I get a different batch than the ones I saw posted on other forums? what's the deal?

fietsbob 04-23-13 09:19 PM

Weigh what you have.. and stop obsessing..

spectastic 04-23-13 09:21 PM

Like I said, it's not too big of a deal. But I'm curious if this is common.

erig007 04-23-13 09:22 PM

frame size, dust, lubricant, tires, balance precision, saddle?

buffalowings 04-23-13 09:28 PM

Do you have all excess crap removed from the bike? Reflectors, bottle cages and the cycling computer add weight no matter how you look at it. Also, it depends on the frame size..finally, who is stopping bikesdirect from underreporting. And.. are you certain your scale is 100% accurate.

spectastic 04-23-13 09:36 PM

my scale reads in 0.2 increments, and lists itself as +-.2 lbs accurate.

frame size is 58 cm, but I've read that the weight goes up by only 28 grams or so for every frame size. The bike is pretty clean, so I doubt dust and lube is a factor. The saddle is a specialized road riva (343 g).

Tires are stock michelins, haven't changed them yet.


And I didn't find the weight on BD, I found them on other forums where people posted the weight of their bike. They were in the 56 cm range.

TrojanHorse 04-23-13 10:14 PM

You're comparing weights from a variety of people with a variety of scales and a variety of aftermarket components on the bike. I'd be pretty surprised to see one legitimately at 19 lb.

Just go ride the thing, it really doesn't matter.

spectastic 04-23-13 10:19 PM

It's not like I'm going to do anything about it. I just want to have a better perspective the next time I buy a bike. For something that's supposed to weigh 20 lbs, a 3 lbs difference is pretty significant, wouldn't you say??

as for the bike computer, bottle cage, and head/tail light mounts, I'll give those 0.5 lbs (~200g) together, tops. That's not enough to explain my question.

P.S. I have a spring gauge that tells me pretty much the same thing

erig007 04-23-13 10:22 PM

I see plenty of hidden weights that when put together can add up pretty fast:

-scale accuracy. Don't know much about digital scales but with analogic scales
(your weight + bike weight ) - your weight is not equal to bike weight
let's say you weight 200lbs, the scale has a 1% error
(200lbs + 23.6lbs ) +/- 1% = +/- 2.236 lbs
23.6lbs +/- 1% = +/- 0.236lbs

-the frame size +28g (seems small)
-if other people have rounded their bike weight
-air chamber weight and air weight
-bottle cage, bike computer, sticker etc weights
-weight variability between bikes
-dust on tires and grease on chain and cassette even if you don't see it
-everything i don't know like if all the other bicycle components are stock components, for your bike and other people's bikes you're comparing with. If the other guys have changed components like the saddle and tires for lighter one for instance then 21lbs is maybe 22lbs with stock components

BigJeff 04-23-13 10:26 PM

the weight sounds accurate.

Weight is less important than comfort.

The only question that matters is if it fits you properly.

The weight weenies out there will ride a bike 6 sizes too small with jumbo stems and seat posts in order to claim "fewer grams"........ don't do that

Wilfred Laurier 04-24-13 02:59 PM

Erig007 hit the nail right on the head. Digital bathroom scales are often disturbingly innaccurate. I have in the past weight myself and got a reading supposedly accurate to 1/2 lb, then took my clothes off and relieved myself of at leasty 1 lb of solid waste, then re-weighed myself and got the same number as before.

If you are losing sleep over it, take the bike somewhere that there is an accurate scale or balance. Otherwise HTFU.

erig007 04-24-13 03:26 PM

There is in fact 2 kinds of errors that can add up:
-the lack of accuracy : the weight result is way off. You usually weight 200lbs but the result is 150lbs
-the lack of precision : weight 10 times and get 10 different results. In this case, one solution is to weight several times and average the result

spectastic 04-24-13 03:26 PM

ok. Imma reweigh myself naked when I get home.

dynaryder 04-24-13 05:29 PM

Quote:

Originally Posted by spectastic (Post 15545960)
my scale reads in 0.2 increments, and lists itself as +-.2 lbs accurate.

Bathroom scales suck. I use a digital fish scale for weighing my bikes(also handy for weighing luggage and packages).

Quote:

Originally Posted by spectastic (Post 15545960)
I've read that the weight goes up by only 28 grams or so for every frame size.

That sounds too small. I used to own a size XL Schwinn DBX. Sold it,and later picked up a size L(same year and components). The XL was 24lbs 4oz,the L is 23lbs 12oz,so that's a half pound difference between them. The L is around a 56,I'd say the XL was a touch bigger than a 58.

dramiscram 04-24-13 05:39 PM

strip the paint, you should save another pound! :rolleyes:

Retro Grouch 04-24-13 08:09 PM

Every bike has 3 weights: What the manufacturer says it weighs, what the guy who owns it thinks that it weighs, and what my scale says that it weighs. Guess which one is almost always highest.

bikebreak 04-29-13 01:58 PM

If it's from bikesdirect, add 2 pounds or 10% to whatever bikesdirect advertises it weighs to get the actual weight.

For my particular bike, the motobecane website said "18.9 lbs, approx." bikesdirect website advertises at 19.5. The shipping carton said net wg 9.5kg (20.9 pounds). Guess which one is the closest to reality...

Anyway, my 21 pound bikesdirect bike is "faster" than the 17-18 pound carbon bikes of the guys I ride with. Hm.

I would upgrade tires first, the conti 4000s is probably much lighter and grips better than whatever is on there.


Quote:

Originally Posted by spectastic (Post 15545894)
My good bike is a windsor knight, with ultegra shifters and derailleurs. I did a search on what its weight is supposed to be, and got it to be somewhere between 19 and 20, no more than 21 lbs. I weighed it just now on my electronic scale, taking the difference between me and me+bike, to get 23.6 lbs! This is with just the bike, water bottle cage, bike computer, and shimano m530 pedals... The pedals together weigh ~1lbs, but everything else shouldn't weigh much at all. It's not too big of a deal, because it was a cheap bike from bikesdirect. but I'm guessing this is not normal. Is it a quality control issue? did I get a different batch than the ones I saw posted on other forums? what's the deal?


Wilfred Laurier 04-29-13 03:00 PM

Quote:

Originally Posted by bikebreak (Post 15566635)
If it's from bikesdirect, add 2 pounds or 10% to whatever bikesdirect advertises it weighs to get the actual weight.

you are missing the fact that the published weight was not on the bd or motobecane website
but weights other people have claimed for their similar bikes on other interweb forums
maybe they were posted by people who installed carbon water bottle bolts and titanium cable ferrules
or maybe they were estimates by people who always round down
ie they lie

i would guess that the stock weight of the ops bike is not that impressive and that is why bd chooses not to list it
also because it doesnt matter


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