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PostPosted: Thu Jul 31, 2014 10:30 am 
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Joined: Sat May 12, 2012 8:32 am
Posts: 584
Location: Adelaide, Australia
Hi guys,

Giant don't publish any fork data appart from rake, which are (apparently) both the same at 45.

I was wondering if there would be any differences in fork length between these two forks?

I'm asking because I replaced a cracked defy fork with a TCR fork, and the steering is much twitcher. I was wondering if that's in the head or if there's actually a difference in the two forks that would cause this.

For reference, I replaced a Defy Advanced fork with a TCR Composite fork.

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PostPosted: Thu Jul 31, 2014 10:37 am 
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Joined: Thu May 23, 2013 9:22 am
Posts: 181
Location: Northampton, UK
I can only assume here, but my defy advanced had more clearance than all my TCR's with regards to mudguards etc.

If the TCR fork is slightly shorter, it will have the effect of lowering the front end and effectivel steepening the head angle so may well be the reason why it feels twitchy..

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PostPosted: Thu Jul 31, 2014 10:54 am 
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Joined: Sat May 12, 2012 8:32 am
Posts: 584
Location: Adelaide, Australia
Thanks for the reply stoo, does anyone have measurements to confirm this?

P.S. Nice stable of Giants :)

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I write the weightweenies blog, hope you like it :)

My SwiftCarbon Ultravox

My Velocite Selene

Disclosure: I'm sponsored by Velocite, but I do give my honest opinion about them (I'm endorsed to race their bikes, not say nice things about them)


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PostPosted: Thu Jul 31, 2014 11:01 am 
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Joined: Thu May 23, 2013 9:22 am
Posts: 181
Location: Northampton, UK
Thanks buddy.

I don't have exact measurements, just assumptions.

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2016 Cannondale Super Six Evo (Non Hi-Mod) - DA9000- Rotor InPower - Cosmic Ultimates (6500g)
2012 Cervelo P2 - UDi2 6770 - Rotor 3D+ Power2Max - Zipp 900 Disc/808FC
2015 Genesis Equilibrium - U6800 - FSA SRM - WH6800


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PostPosted: Thu Aug 07, 2014 10:53 am 
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Joined: Sat May 12, 2012 8:32 am
Posts: 584
Location: Adelaide, Australia
Bump

to add to the list of observations it looks like toe overlap has increased - does this confirm that the forks are shorter?

_________________
I write the weightweenies blog, hope you like it :)

My SwiftCarbon Ultravox

My Velocite Selene

Disclosure: I'm sponsored by Velocite, but I do give my honest opinion about them (I'm endorsed to race their bikes, not say nice things about them)


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PostPosted: Thu Aug 07, 2014 10:57 am 
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Joined: Thu May 23, 2013 9:22 am
Posts: 181
Location: Northampton, UK
Potentially yes, because the head tube would be lower and shortening the wheelbase, moving the wheel rearwards.

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2016 Cannondale Super Six Evo (Non Hi-Mod) - DA9000- Rotor InPower - Cosmic Ultimates (6500g)
2012 Cervelo P2 - UDi2 6770 - Rotor 3D+ Power2Max - Zipp 900 Disc/808FC
2015 Genesis Equilibrium - U6800 - FSA SRM - WH6800


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