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-   -   backpack weight (http://www.bikeforums.net/road-cycling/893316-backpack-weight.html)

dusty01 06-02-13 02:11 PM

backpack weight
 
On long rides I take a back pack with extra tube and such. I've heard that every pound on bike equals five in pack. Is this ratio correct?

wphamilton 06-02-13 02:23 PM

I think it makes a difference if your bike has suspension, in how well it holds the road. On a road bike with no suspension (ie, your body is the suspension spring) it's only sprung weight if you're out of the seat and cornering, accelerating or stopping. It won't make any difference in performance, acceleration, going up hills etc. So mostly "no", but in the specific case of cornering on the road with a mtb I'd expect that to be about right.

For a road bike, the advantage is also counterbalanced by the advantages of having the load carried low, which is the preference of most touring cyclists.

datlas 06-02-13 04:29 PM

No. I think the correct ratio is really 1:1.

On the other hand, I don't think backpacks really have much of a role on a road bike. Most of us use a saddle bag and/or jersey pockets.

halfspeed 06-02-13 04:33 PM

A backpack is a pretty awful way to carry weight on a road bike, especially if your position is at all aggressive. If your long rides take enough time that you can't carry what you need in a jersey pocket, a Carradice or even a handle bar bag are good alternatives.

DonDenver 06-02-13 04:43 PM

Fify:

Quote:

Originally Posted by dusty01 (Post 15695835)
on long rides i take a back pack with extra tube and such. I've heard that every pound in the pack equals 5 on the bike. Is this ratio correct?


dusty01 06-02-13 05:14 PM

This is kinda what I was thinking, but I've had the conversation with a few people and this is what I was told.

MegaTom 06-02-13 05:24 PM

Quote:

Originally Posted by dusty01 (Post 15696360)
This is kinda what I was thinking, but I've had the conversation with a few people and this is what I was told.

Now you're having a conversation with another few people and they're telling you different. What're ya gonna do...?

znomit 06-02-13 05:46 PM

What's the ratio in metric?

dusty01 06-02-13 05:52 PM

I'm going think what I orginally thought that it don't matter weight is weight.

datlas 06-02-13 05:59 PM

Yes. It does not matter. Weight is weight.

Except for rotating weight...

Maybe.

Homebrew01 06-02-13 07:13 PM

Quote:

Originally Posted by datlas (Post 15696214)
No. I think the correct ratio is really 1:1.

On the other hand, I don't think backpacks really have much of a role on a road bike. Most of us use a saddle bag and/or jersey pockets.

Yup.

DonDenver 06-02-13 08:52 PM

Quote:

Originally Posted by datlas (Post 15696474)
Yes. It does not matter. Weight is weight.

Except for rotating weight...

Maybe.

rotational..."maybe" just a hair more towards "perhaps".

Yes, weight is weight, but, one thing is true: placing that additional weight anywhere on your person will have a greater negative impact. It does influence as a cost of energy and stress to you at all your bike touch points as well as the overall physiological adaptation you make to carry that weight on your personal frame. Your better served lugging that weight on your bike frame. Your are even better served eliminating that weight altogether ;)

shoota 06-02-13 08:58 PM

Do yourself a favor and ditch the backpack.


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