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Ok, so I forgot my conversions...grams per pound??(21 posts)

Ok, so I forgot my conversions...grams per pound??MVN
Feb 13, 2002 10:14 PM
How many grams are in a pound? I'm trying to see if new lighter rims and tires are really worth any weight savings. My current setup is 890g per wheel. What I'm looking at is 705g per wheel. Does 370g shaved off of total weight make that much of a difference? By the way, my bike is a Trek 1000 with Armadillo 23c tires and Velocity Deep V rims. Just toying with the idea of making it lighter any way I can. Thanks for your time. All thoughts and opinions welcome.
re: Ok, so I forgot my conversions...grams per pound??Bender
Feb 13, 2002 11:17 PM
454g = 1 pound

And yes you'll notice quite a difference by reducing the rotational mass of your bike. It takes power to move objects, like wheels, and reducing thier weight translates into better acceleration. Saving weight, especially at the greatest radius (rims), at the wheels is one of the best things you can do improve bicycle performance.

30 grams = 2 house keysDWridesGT
Feb 14, 2002 2:22 AM
Just trying to put things into perspective. I was floored to learn by dropping 30 grams from my bike I reduced it's weight by a mere 2 house keys worth of weight. Expensive, I'd say. If you feel you must drop weight from your bike, target your wheelset first.

Just ride the bike!!

So, 1 lb = 30 house keys!tarwheel
Feb 14, 2002 4:43 AM
Do they make carbon fiber house keys? The aluminum ones are light, but transmit a lot of vibration.
So, 1 lb = 30 house keys!litespeedcat
Feb 14, 2002 5:33 AM
I have a new set of house keys with carbon and vectran. They feel buttery smooth going into the lock and turning the cylinder. Also, if the lock hangs up I know that my keys won't snap! When I am walking to the elevator I don't even notice them weighing me down like my old school metal keys used to. Even thought they were $20 a gram they are more than worth the difference.

Go for it! Get some new carbon/vectran house keys! You won't believe that you have suffered so long with the "standard" metal keys.
So, 1 lb = 30 house keys!allervite
Feb 14, 2002 9:28 AM
Actually i prefer Titanium keys. A small nick in your key caused by a bur in the cylinder could sause a sudden and catastrophic failure resulting in injury or death (of the key).
28.350 grams to an ounce (nm)Paul
Feb 14, 2002 3:52 AM
sandwich baggies weigh a grampmf1
Feb 14, 2002 5:47 AM
As does a dollar bill (in case one needs some counterbalance weight).

454 grams = 1 pound.

The things you learn in High School back in the 1970's ...
Trek 1000 and you're counting grams on a wheelset?cyclaholic
Feb 14, 2002 6:04 AM
If you are talking about the current Trek 1000 frame, we are not talking about a lightweight product. It seems inconsistant to me to nitpick over grams on the wheelset (even a couple of hundred grams) when you are riding a relatively heavy frame. I consider the Trek 1000 to be an entry level product. Any increase you expect by getting a much lighter (better quality, much higher cost) wheelset will be offset naturally by the nature of the frame itself. I'd liken it to putting high performance racing tires on a family sedan. You gotta look at the big picture.
Trek 1000 and you're counting grams on a wheelset?Former Trek owner
Feb 14, 2002 10:26 AM
Actually, you are wrong. Putting a set of hi-performance tires on a family sedan is the quickest and usually one of the cheaper ways of drastically improving handling.
Trek 1000 and you're counting grams on a wheelset?grzy
Feb 14, 2002 6:17 PM
Yeah, but you're not talking spending the equivalent of $2,000 in light alloy rims and the latest in super grippy tires on the grocery getter. It's sort of like putting Porsche rubber and rims on a VW bug. Much of what you're doing is getting rid of the OEM POS tires and the spongy ride for something stiff that will actually corner - you may want larger rims so you can get a lower profile tire. On a bike wheels and tires are your biggest bang for the buck since you save on both rotating and non rotating mass and the extra energy required to accelerate them - you'll never notice this on a passenger car. So yeah, upgrading wheels and tires on both bikes and cars can have a big effect, but they're different effects and for different reasons.

If you do take the plunge you can keep the nice wheels when and if you upgrade to a new bike. You will definitely notice the difference if you upgrade the wheels, but you may want to demo a pair to decide exactly how much it's worth. Once you get on a good pair of wheels it's damn hard to go back to the others. My guess is that you're thinking of spending something north of $400 on an entry level bike.
2.2 Pounds per kilogram, 1,000 grams per kilogramXXX
Feb 14, 2002 6:10 AM
It might be easier to remember that 1 kilogram, or one thousand grams, is 2.2 pounds. So remember 1,000/2.2 = 454.55 grams (approximately) per pound. Which means that 370/455 = about 0.81 pounds, or approximately 13 ounces. Fairly significant. check it out for all your conversion needs NMMikebikr
Feb 14, 2002 6:44 AM
forget lbs and oz and start using a logical and simple systemscruffy duncan
Feb 14, 2002 7:08 AM
It's still a good idea to upgrade those wheelsJimP
Feb 14, 2002 7:26 AM
The 370gm reduction may only represent 2-3% of the total bike weight but is a reduction of 20% of the wheel weight. You didn't mention which wheels but I would assume that there will be a reduction in the number spokes as well as better rim aerodynamics. You will notice a big difference in the responsiveness of the bike by changing those wheels and the overall result will be a faster bike that will be more fun to ride. Also, if you want to upgrade to a higher line frame in the future, you may wish to keep the new wheels for it too.
It's still a good idea to upgrade those wheelsscruffyduncan
Feb 14, 2002 8:06 AM
on this topic, I am looking at various bikes. The frame will be lightweight, but I do not have loads of money for top grade components. My thoughts are to go with the best wheels I can get at the expense o the gruppo. I have campy veloce at the moment and it's fine. Any thoughts?
Now you've got the right idea!cyclaholic
Feb 14, 2002 12:19 PM
I think you are on the right track. Start with the frame first. If you have a heavy or otherwise inferior frame, then every upgrade you make from that moment forward will be playing catch up. And all of your upgrades will be offset by the inferiority of the frame. I maintain that starting with a heavy frame and then fretting over ways to save grams is like shutting the barn door after the horse got out.

1. Get the best frame you can afford. Don't cheap out.

You have to have a gruppo and you have to have wheels. Which will last the longest? The components will be on your bike for a very long time and they are usually more expensive than your wheels. In time, the wheels will wear and they will need replacement. Put the higher priority on the components.

2. Get the best components that you can afford, even if it means enduring a decent wheelset for a few thousand miles.

Wheel technology is zooming forward. Just a few years ago, I remember going bonkers over the first set of Rolf Vectors I saw. Those things are very close to being obsolete now. Lots of lighter wheelsets at very affordable prices available now.

If you skimp on your components now at the beginning in order to buy an expensive wheelset, I would say that's the equivalent of being penny-wise but pound-foolish.

Get your top notch wheels when you've got a good bike to put them on. Follow this simple set of rules and, in time, you will have a great bicycle.
How long would this have take you to find on the web? (NM)DUG
Feb 14, 2002 9:30 AM
re: Ok, so I forgot my conversions...grams per pound??flying
Feb 14, 2002 9:51 AM
Hey this is a really cool tool & it is free.
Conversion ProgramGW Rider
Feb 14, 2002 9:53 AM
Download this program, it's a handy little application.

-Keep the shiny side up and the dirty side down.
lbs. x 453.59 = grams / grams x .0022 = lbs.Jimbo
Feb 14, 2002 5:37 PM