Best expander plug with or without weight being a factor?

Discuss light weight issues concerning road bikes & parts.
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Lewn777
Posts: 833
Joined: Thu Mar 09, 2017 5:35 am

by Lewn777

I was thinking about getting a new exapander plug I've got four, but none of which I love. Been having some issues with some slipping and some of the weights seem heavy.

Ideally:
-sub 40g
-doesn't slip, even when over-torqued from cap bolt
-supports bottom stem bolt

I'm aware of
-Cannondale Expander Top Cap
-Extralite UltraStar 3 Expander
-Schmolke Expander SL
-PRO expander ud carbon (looks heavy but non-slip)

Anyone got any favorites or recommendations?

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FIJIGabe
Posts: 1848
Joined: Tue Sep 11, 2012 6:07 pm
Location: The Lone Star State

by FIJIGabe

In the past, I've used three different expanders: stock Bontrager (28g), UltraStar 2 & UltraStar 3. I found the US2 to be pretty good (no slipping), but the 3 slipped. I'm currently using the stock Bontrager unit, because it just doesn't move.
Madone 9 - https://bit.ly/2Nqedbn
Emonda SLR - https://bit.ly/2UK5FP8
Crockett - https://bit.ly/2Xem4sk

Madone 5, Cobia. I own a lot of Treks.

by Weenie


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Lewn777
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Joined: Thu Mar 09, 2017 5:35 am

by Lewn777

FIJIGabe wrote:
Tue May 14, 2019 3:03 pm
In the past, I've used three different expanders: stock Bontrager (28g), UltraStar 2 & UltraStar 3. I found the US2 to be pretty good (no slipping), but the 3 slipped. I'm currently using the stock Bontrager unit, because it just doesn't move.
Stock Bontrager seems like a reasoanble weight, and no slipping issues, might take a look at that.
Nice suggestion. :thumbup:

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nickf
Posts: 822
Joined: Sat Mar 06, 2010 10:34 pm

by nickf

I have been using the ultrastar 2 for a few years now on multiple bikes with no issues. I have one on my Trek Checkpoint, Cannondale SS EVO HM, and a Enve 1.0 fork. No slipping, easy setup, weighs close to nothing.

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maverick_1
Posts: 742
Joined: Tue Sep 11, 2007 4:20 pm
Location: Tokyo

by maverick_1

Kuwahara-hirame expander plug below.
Bullet proof, just like the Campy/Shimano’s QR.
Made in Japan.

33 grams

https://www.kuwahara-bike.com/hirame-mu ... ure-anchor

shuttlenote
Posts: 78
Joined: Wed Jun 07, 2017 7:17 am

by shuttlenote

FIJI: Is this the Bontrager you're using?
https://www.tritoncycles.co.uk/componen ... cap-p20914

asiantrick
Posts: 241
Joined: Fri Dec 04, 2015 11:18 pm
Location: the OC, CA

by asiantrick

My Addict SL been suffering from expander plug slippage. I recently switched to Deda Expander Bung and been super happy with it. Absolutely no slippage and very well made. You can get it from wiggle for $16

https://www.wiggle.com/deda-expander-bung/

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PinaRene
Posts: 652
Joined: Mon Feb 12, 2007 12:08 pm

by PinaRene

Carbon - ti with Riesel topcap on 2 out of 3 bikes - they don't slip with topcap on 3Nm and it's enough for bearing preload. Did cobble rides - bad roads and they still are perfect. Ordered @ R2 bikeshop in Germany.

Image
Image

1415chris
Posts: 1281
Joined: Sat Apr 18, 2009 8:59 am
Location: Surrey UK

by 1415chris

Extralite mk2, light, mount and forget, many years on couple of bikes.
PinaRene, that's a lovely, cool top cap, thanks for a tip will definitely get one.

dastott
Posts: 178
Joined: Wed Jun 17, 2015 12:35 pm

by dastott

Had slippage with the light Cannondale one recently. Have put the heavy (50g) Cannondale one back on so this thread is well timed for me. Thanks.

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Lewn777
Posts: 833
Joined: Thu Mar 09, 2017 5:35 am

by Lewn777

maverick_1 wrote:
Tue May 14, 2019 5:22 pm
Kuwahara-hirame expander plug below.
Bullet proof, just like the Campy/Shimano’s QR.
Made in Japan.

33 grams

https://www.kuwahara-bike.com/hirame-mu ... ure-anchor
Seems like a good option, but for the life of me I can't figure out how to buy this from this website. :noidea:
EDIT: Alex's cycle https://alexscycle.com/products/hirame- ... e-anchor-1
Last edited by Lewn777 on Tue May 14, 2019 11:33 pm, edited 1 time in total.

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Lewn777
Posts: 833
Joined: Thu Mar 09, 2017 5:35 am

by Lewn777

Anyone had any luck with some of the OEM plugs? We know that Cannondale heavier one and Bontrager are proabably quite good. It's just I'm in Asia and would like to get something out of a shop if possible. The 10 day postage time from Europe is quite annoying.

Anyone got anything on Specialized, Giant (is it even the same size?), Merida etc

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Lewn777
Posts: 833
Joined: Thu Mar 09, 2017 5:35 am

by Lewn777

PinaRene wrote:
Tue May 14, 2019 9:13 pm
Carbon - ti with Riesel topcap on 2 out of 3 bikes - they don't slip with topcap on 3Nm and it's enough for bearing preload. Did cobble rides - bad roads and they still are perfect. Ordered @ R2 bikeshop in Germany.

Image
Image
Cobble rides are a great test, and 3nm is a good torque, this seems like a good option. Thanks. :thumbup:
What torque are you using on the plug? 6nm?

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Lewn777
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Joined: Thu Mar 09, 2017 5:35 am

by Lewn777

For anyone reading this thread that's new to expander plugs you generally install the expander plug (ideally so that your bottom stem bolt is supported) to a torque of 6-8nm.
You then tighten the top cap bolt to a torque of 2nm-3nm and your stem bolts to the indicated torque (usually 5nm).

Warning overtightening can damage your bike, so unless you have a torque wrench don't mess with the expander if everything is working well although this is an area that can see 20g-40g of weight savings.

Orbital
Posts: 161
Joined: Wed Feb 14, 2018 12:52 am
Location: Pitt Meadows, BC

by Orbital

dastott wrote:Had slippage with the light Cannondale one recently. Have put the heavy (50g) Cannondale one back on so this thread is well timed for me. Thanks.
I initially had slippage when I went to the lighter one. Use a bit of carbon paste and haven’t had issues since.

by Weenie


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