Lengthening the fork

Hullo,

I fucked up the geo of my bicycle by putting a carbon fork that's 15mm shorter than the original, it handle better (steeper headtube + big rake), unfortunately, it mean the reach has gotten longer as a result.

is it feasible to have some kind of spacer between the fork and the headset to add 15mm worth of space to get the headtube angle back to normal?

i saw tthe thread title and assumed this would be something about anaesthetic condoms...

Either adding to the top.

Question what kind is it 1" or 1 1/8"?

Pics are better than any words can explain.

S/F,
CEYA!

1 1/8 threadless, adding at the bottom mean it'll increase the height by 15mm and put the headtube angle back to what it originally was.

What the fuck is this thread about?

You want to lengthen a carbon fork?

Cain Creek headset?

The downhill mtb one's you can adjust.

http://www.canecreek.com/component-headsets?browse=Complete&name=AngleSet

scrap what i said, didn't know about those head-tube extenders

like this?
http://www.eighthinch.com/headtube_extenders.html
Why not just get something fit for purpose in the first place?

...or buy the top half of the steel Chris King uber hard core headset with the extra long section and put some custom machined spacers inbetween.

...or what about brasing an extension onto the bottom/top of the headtube?

...or email enve about building you a custom fork.

What the fuck is this thread about?

You want to lengthen a carbon fork?

measure twice cut once...

I fucked up the geo of my bicycle

it handle better (steeper headtube + big rake)

Doesn't sound like you fucked it up to me, Ed!

I know piss all about bike geometry but amazing that 1.5 cms makes such a difference.

How has the reach changed though? Surely the shorter fork blades mean the front is lower but how have the bars and saddle moved in relation to each other if you just swapped the forks out?

Why not just put the original fork back on if that's the right length?

You heartless bastards. Think if his sit bones! Won't someone think of the sit bones!

like this?
http://www.eighthinch.com/headtube_extenders.html
Why not just get something fit for purpose in the first place?

Good idea.

Plus:

Makes most un-bar-spin-able bikes able to bar-spin!

Lfgss's first nodder cmx with racks.

removing 15mm from the fork will rotate the whole bike about the the rear hub which acts as a pivot point. This will have rotated the BB, bars & saddle forward and down (the amount they move is relative to the distance from the rear hub). Presumably ed has adjusted his saddle so that it's in the correct position relative to the BB. So now he needs to compensate for the change in saddle to bar height and reach. I'd do this with a new stem rather than some weird head set/fork magic. Or get a new fork that fits :-)

^interesting, thanks

i'm not sure i explained that very well - hope it made sense.

If it's a matter of saving weight with the original forks, how about removing the braze ons and rack?

removing 15mm from the fork will rotate the whole bike about the the rear hub which acts as a pivot point. This will have rotated the BB, bars & saddle forward and down (the amount they move is relative to the distance from the rear hub). Presumably ed has adjusted his saddle so that it's in the correct position relative to the BB. So now he needs to compensate for the change in saddle to bar height and reach. I'd do this with a new stem rather than some weird head set/fork magic. Or get a new fork that fits :-)

Spot on, the saddle have to be moved back a bit so it's less of a TT position, however, I'm running a 60mm stem that now felt a bit long after the change of fork.

The original fork were a steel "trick" fork with 410mm length which is not a normal length, I've now got a carbon CX fork with 395mm length.

It handle better, but compromised by the lengthened reach due to steeper head angle.

like this?
http://www.eighthinch.com/headtube_extenders.html
Why not just get something fit for purpose in the first place?

Look like that might be the best option, I reckon I can shave 5mm off the spacer and make it usable.

damn Brooklyn Machine Work and their weird geo.

The original fork were a steel "trick" fork with 410mm length which is not a normal length, I've now got a carbon CX fork with 395mm length.

It's a trick bike.

Hover Over Image To Zoom+

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Total of 3 images

Stunning carbon trekking fork with 7075 Al steerer, carbon fiber stanchions and forged 6061 Al dropouts and crown.

This fork has V brake mounts, an IS disc brake mount and mud guard mounts.

Rigorously tested to EN and DIN standards

Offset: 42mm
Length measured from center of hub to top of crown 410mm

Options and weight: VIEW FORK SELECTOR

Why not get a fork that fits in the first place?