Where is the best place to add weight?

Discuss light weight issues concerning road bikes & parts.
Zoro
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Joined: Wed Oct 30, 2013 12:52 am

by Zoro

(disclaimer - I'm trying to get my 10 posts for the Starbike 5% discount)
So next year my son races in the 17-18 age group. Some races - very few - but some are know to get strict about UCI bicycle requirements in that age group. A few kids got their bikes DQ'd this year, so while its rare - it happens.

So the question is - where is the best place to add about a kg to the bike for :
A-Best handling
B-Easiest to add and remove

I heard P Sagan was running a big steel BB spindle. Certainly that does not meet the B criteria. I often think maybe a higher center of gravity as in the seat post is nicer as the rider gets a more stable reverse pendulum effect. So current thought are a lead weight in the seat post.

by Weenie


rijndael
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Location: Haines, AK - Temporarily

by rijndael


5 8 5
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Joined: Sat Jul 29, 2006 2:36 am
Location: UK

by 5 8 5

In the seat tube or bottom bracket area to lower the centre of gravity.

rijndael, you are joking aren't you?

Zoro
Posts: 349
Joined: Wed Oct 30, 2013 12:52 am

by Zoro

rijndael wrote:http://www.ammcoats.com/wheel-weights/stick-on-adhesive-wheel-weights" onclick="window.open(this.href);return false;
Hmm, the TDF riders got to figure out an easy way to cheat with these. Tape a few under the seat before weigh-in and rip them off before the hill. I feel a scandal coming.

Zoro
Posts: 349
Joined: Wed Oct 30, 2013 12:52 am

by Zoro

5 8 5 wrote:In the seat tube or bottom bracket area to lower the centre of gravity.
I know a lower cg make the bike more toss-able. I have ridden the Brooks-pro saddles for years and notice the counterweight feeling of it. Also the DiII batteries are often in the seat post. Seems you think they should be lower near the BB.

Oh - got my 10 posts - I can go order from Starbike now!

eric
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by eric

I hated having a seat post mounted water bottle. Makes the bike feel funny.

I'd make weight(s) that bolt between the bottle cages and frame.

rijndael
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Joined: Tue Sep 20, 2011 12:54 pm
Location: Haines, AK - Temporarily

by rijndael

5 8 5 wrote:rijndael, you are joking aren't you?

Half joking.

There are pics of pro bikes out there with 50g (or was it 40g) weights taped to the bottom bracket shell and down tube. I can't find them right now. I've read that a clause was added to remove that option, but I've not seen it.

Causidicus
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Joined: Tue Apr 17, 2012 11:20 am

by Causidicus

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Last edited by Causidicus on Tue Jun 17, 2014 11:11 pm, edited 2 times in total.

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Kayrehn
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Joined: Thu Mar 24, 2011 6:06 pm

by Kayrehn

Actually how about adding weight to Morocco performance? Like getting a very sturdy chain catcher, or bombproof tires and tubes.

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theremery
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Joined: Sun Jun 12, 2005 10:56 am
Location: New Zealand

by theremery

Bombproof tyres and tubes = slow acceleration via raised rotating mass (i.e. a very bad ideA INDEED!)
Updated: Racing again! Thought this was unlikely! Eventually, I may even have a decent race!
Edit: 2015: darn near won the best South Island series (got second in age
-group)..woo hoo Racy Theremery is back!!

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DMF
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Location: Sweden

by DMF

Just place a cylindrical steel-weight inside the BB-axle, if you have Shimano cranks you already even have a bolt that stops it coming out. With Campaq/Sram you just duct tape around it 'til the fit is snug.

Low center of gravity - Good
High center of gravity - Just crap handling, the seat mounted bottles work for triathlon as active handling is of no.concern

User Name
Posts: 597
Joined: Tue Jun 07, 2005 3:32 pm

by User Name

a stiffer, heavier fork with an aluminium steerer. It's an easy changeover, and it may even improve handling :thumbup:
Last edited by User Name on Wed Nov 06, 2013 6:01 pm, edited 1 time in total.

5 8 5
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Joined: Sat Jul 29, 2006 2:36 am
Location: UK

by 5 8 5

rijndael wrote:
5 8 5 wrote:rijndael, you are joking aren't you?

Half joking.

There are pics of pro bikes out there with 50g (or was it 40g) weights taped to the bottom bracket shell and down tube. I can't find them right now. I've read that a clause was added to remove that option, but I've not seen it.

Ha ha! It was late and I saw the reference to wheel weights. I was imagining 500g of weights attached to each wheel!

5 8 5
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Joined: Sat Jul 29, 2006 2:36 am
Location: UK

by 5 8 5

Zoro wrote:
5 8 5 wrote:In the seat tube or bottom bracket area to lower the centre of gravity.
I know a lower cg make the bike more toss-able. I have ridden the Brooks-pro saddles for years and notice the counterweight feeling of it. Also the DiII batteries are often in the seat post. Seems you think they should be lower near the BB.

Oh - got my 10 posts - I can go order from Starbike now!

A kilo is a lot to add high up. The normal locations are seat tube and bottom bracket area.
I take it you want something easily removable for non-UCI regulation races?

aaric
Posts: 439
Joined: Thu Jun 09, 2011 4:10 pm

by aaric

Heavier cassettes and skewers would be my first choice.

by Weenie


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