Crux 2021

Especially for light weight issues concerning cyclocross / touring bikes & parts.

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FactoryMatt
Posts: 927
Joined: Tue Apr 14, 2015 4:35 am

by FactoryMatt

you must use a 34.9mm Front Derailleur + the shim band that comes with the frame. they warn NOT to use a 31.8 FD directly on the frame.

23mm ID rim is fine. i run 22+ 38c tire, comes out to about 41mm width. max actual tire width is really about 40mm without rubbing when the rear tire/wheel flexes.
Last edited by FactoryMatt on Mon Nov 23, 2020 6:36 am, edited 1 time in total.

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singletracknick
Posts: 11
Joined: Tue Oct 24, 2017 8:27 am

by singletracknick

FactoryMatt wrote:
Mon Nov 23, 2020 12:56 am
you must use a 34.9mm Front Derailleur + the shim band that comes with the frame. they warn NOT to use a 31.8 FD directly on the frame.

23mm ID rim is fine. i run 22+ 38c tire, comes out to about 41mm width. max tire size is really about 40mm without rubbing when the rear tire/wheel flexes.
Why is that?

I have a 31.8 der directly mounted and hasn't caused and issue?

FactoryMatt
Posts: 927
Joined: Tue Apr 14, 2015 4:35 am

by FactoryMatt

i don't know, but i suspect they're concerned about the clamp applying even pressure on the tube. mine came with a written notice in bold writing warning against doing so. the shim that comes with the frame is pretty elaborate.

samarskyrider
Posts: 104
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Location: Moscow, Russia
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by samarskyrider

FactoryMatt wrote:i don't know, but i suspect they're concerned about the clamp applying even pressure on the tube. mine came with a written notice in bold writing warning against doing so. the shim that comes with the frame is pretty elaborate.
Is it specific shim or something that can be sourced w/o specialized dealer? If possible, please post pics


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samarskyrider
Posts: 104
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by samarskyrider

FactoryMatt wrote:It looks like this.

https://www.amazon.com/FSA-Derailleur-S ... B0096XYQF2
Thank you!


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gwerziou
Posts: 302
Joined: Wed Feb 20, 2019 7:25 pm
Location: Ballard, WA

by gwerziou

Is this FSA part directly usable on the Crux, or does it just resemble the actual shim that you need to use?
• A bike, pretty sweet
• An old bike, still pretty fun to ride
• Unicycle, no brand name visible

FactoryMatt
Posts: 927
Joined: Tue Apr 14, 2015 4:35 am

by FactoryMatt

gwerziou wrote:
Fri Dec 04, 2020 5:03 pm
Is this FSA part directly usable on the Crux, or does it just resemble the actual shim that you need to use?
it's directly usable. same piece.

Briscoelab
Posts: 1740
Joined: Thu Jan 26, 2006 6:01 pm

by Briscoelab

samarskyrider wrote:
Sun Nov 22, 2020 8:59 pm
Can anyone advise what size of clamp is needed for front derailleur?

Concerning the wheels, will it make sense to run 23mm ID rims on this frame?


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I run both 21mm ID and 25mm ID rims. They both work fine. I have some 28mm road tires on the narrower wheel (Specialized C38) and 33mm Specialized Tracers on the 25mm Enve 3.4AR.

rothwem
Posts: 105
Joined: Wed Jul 09, 2014 4:45 pm
Location: Asheville, NC

by rothwem

Briscoelab wrote:
samarskyrider wrote:
Sun Nov 22, 2020 8:59 pm
Can anyone advise what size of clamp is needed for front derailleur?

Concerning the wheels, will it make sense to run 23mm ID rims on this frame?


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I run both 21mm ID and 25mm ID rims. They both work fine. I have some 28mm road tires on the narrower wheel (Specialized C38) and 33mm Specialized Tracers on the 25mm Enve 3.4AR.
How wide do the 33mm tracers blow up on your 25mm wheels?

I’ve got 38mm tracers on 19mm internal wheels, it seems like all the newer gravel stuff is super wide and the Crux doesn’t have a whole ton of space. I was thinking I’d have to drop down to 35s if I got a wide rim like that to fit in the frame.

FactoryMatt
Posts: 927
Joined: Tue Apr 14, 2015 4:35 am

by FactoryMatt

38 terrenos on 22mm internal hookless are fine. i run a little coke can taped inside of the chainstays for good measure.

there's no need for 25i rims on gravel tires IMO.

kppolich
Posts: 81
Joined: Fri Jan 16, 2015 3:03 pm

by kppolich

15.75lbs with Enve CX Tubulars, XG1190 11-32 cassette, Zipp SL Speed post, stem, and SL70 carbon ergo bars. Love this bike, titanium spindles for the XTR pedals on the way.
Image

FactoryMatt
Posts: 927
Joined: Tue Apr 14, 2015 4:35 am

by FactoryMatt

beautiful. where did you source the ti spindles? keep an eye on those ball-bearing races :)

samarskyrider
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by samarskyrider

Looks clean


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by Weenie


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kppolich
Posts: 81
Joined: Fri Jan 16, 2015 3:03 pm

by kppolich

FactoryMatt wrote:
Mon Jan 25, 2021 7:25 pm
beautiful. where did you source the ti spindles? keep an eye on those ball-bearing races :)
I was willing to try these out. Picked up a pair for my Ultegra R8000 pedals as well.
https://titaniumplanet.com/en/products/ ... ength-_4mm

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