Raising slammed stem

Discuss light weight issues concerning road bikes & parts.
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Boshk
Posts: 428
Joined: Wed Jul 19, 2017 2:59 am

by Boshk

How safe/unsafe is this:

Used Colnago bike
Colnago fork expander are usually 3in long

The bike is slammed, so the fork has been cut.

Is it possible to place a 10mm spacer below the stem, get discarded carbon fork tube from LBS, cut 10mm off, place it on top of my fork tube and secure it with expander, stem and cap?

by Weenie


gorkypl
Posts: 78
Joined: Fri Sep 21, 2018 9:31 am
Location: Poland

by gorkypl

I would not even consider this as a repote possibility.
Invert the stem or contact your local carbon tech shop to extend the steerer tube.

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Klaster_1
Posts: 798
Joined: Mon Aug 15, 2016 10:25 am
Location: Russia

by Klaster_1

Maybe flip a 17/20 deg stem? If that's not enough, put riser road bar like S-Works Aerofly on.
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eric01
Posts: 650
Joined: Mon Feb 06, 2006 1:06 am

by eric01

A definite no. Don’t risk it. Get a positive rise stem but don’t mess with the fork steere
Specialized Tarmac Sworks SL6, Moots Compact, Carl Strong Titanium

Bluechip
Posts: 137
Joined: Thu Nov 12, 2015 2:04 am

by Bluechip

If you don't want a high rise stem you could always get a new fork or used one with a longer steerer tube.

alanyu
Posts: 215
Joined: Thu Jun 06, 2019 1:10 pm

by alanyu

At least 2/3 of the upper bolt should not exceed the steerer.

TobinHatesYou
Posts: 4694
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

Are you looking to suffer a serious trauma?

ancker
Posts: 147
Joined: Sat Dec 31, 2011 9:29 pm

by ancker

Buy a replacement fork with a longer steerer tube.

If you can't or you can't afford to, then don't buy the used bike.

HeluvaSkier
Posts: 177
Joined: Thu Sep 17, 2009 5:38 pm

by HeluvaSkier

If you are only looking for 10mm, a zero-degree rise stem will easily get you that much vertical height at the bars (assuming your stem is a modest 6 degrees, at least 100mm and you haven't already flipped it). Easton EA90 with Ti bolts is a nice light option with reasonable aethetics.

If you've flipped your stem already, consider going to a 10 or 12 degree stem... Revisiting highschool trigonometry... I think roughly speaking that for a 100mm stem, every 6 degrees gives about 10mm in bar height change.

alcatraz
Posts: 2421
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Positive angle stem is choice no 1.

After that maybe look into getting a dropbar shaped like the specialized venge where the clamp area has a low offset.

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pdlpsher1
Posts: 2467
Joined: Thu Jul 19, 2012 6:09 pm
Location: CO

by pdlpsher1

The cheapest way to add stack height is to rotate the bars upward. Not ideal but worth a try and it’s free. Just a tiny bit of rotation will make a big difference.


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Boshk
Posts: 428
Joined: Wed Jul 19, 2017 2:59 am

by Boshk

thanks for the advise. Time to look for a 'higher' degree stem.

Wookski
Posts: 1138
Joined: Tue Feb 23, 2016 5:51 am

by Wookski

It’s only 10mm, keep riding it and soon enough you’ll get used to the position.

tmchen
Posts: 47
Joined: Wed Mar 19, 2014 7:12 am

by tmchen

Or maybe you can try a raised handlebar?


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by Weenie


Bogan
Posts: 287
Joined: Tue Feb 11, 2014 11:47 pm
Location: Boganville, Australia

by Bogan

As Klaster commented, Aerofly riser bar.

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MAMIL? Never. O.F.I.L. yeh! (Old F**ker in Lycra)

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