Fork height, trail, and rake questions

Hmm, none of those deal with fork height... that's weird.

OK so I just bought a carbon fork for my track bike. My old fork was 35mm i think this new one will have 43mm rake.

My bike is a 14 bike co Hanbury. (there traditional track geometry frame)

Right now its super tight with toe overlap, can some one give me some advice on whether this is a good idea to change forks.

I really use this bike for everything, but not on the track. This new fork should get rid of the toe overlap but will it totally ruin that nice tight steering?

Should i lengthen my stem too to match the longer fork?

Thanks

place with this.
http://yojimg.net/bike/web_tools/trailcalc.php

Is the fork also longer (as in axle to crown distance). This will raise the front end and slacken the head tube angle.

In all honesty I'd forgo the maths, and give it a test ride if I already had it.

it ss coming soon and its a 1" new old stock look aero fork so i really want to use it so i might just not care. its not like i will be finding a carbon drilled track fork in a 1" ahead any time soon.

Oh and thanks for the website.

Serious dredge but I think this is a nice article on the geometry of handling, if that makes sense.

http://www.cyclingtipsblog.com/2011/02/the-geometry-of-bike-handling/

The forum search function gave me exactly what I needed to know! Cheers guys!

So i've being researching fork rake and trail for a hour or so trying to get my head around it, without success.

Am i right in thinking that less rake makes less trail which makes the bike less stable and more twitchy. I.e perfect for a track bike and that more rake means more trail which makes it more stable. i.e Road Bikes.

I've just bought a Leader 735 Frame and was looking for a fork for it.

I already own a pair of Dedacciai Full carbon Davs Fork which i used to have on a road bike. These have 44mm rake.

I was reading on velospace that that amount of rake would kill the way this bike frame is meant to handle and make the build look really slack. So then i was looking into the Leader I-806A V2 fork which has 35mm Rake.

I entered all of these details into the bicycle trail calculator but the results confuse me http://yojimg.net/bike/web_tools/trailcalc.php

With the Davs fork the trail comes out at 51mm
With the Leader fork the trail comes out at 61mm

Now that doesn't make sense to me and if someone could explain it would really help. Also with 9mm rake make that drastic of a handling change.

Thanks

anyone?

Drew this for you:

So*: More trail = less rake

*other things being equal

Okey...More trail equates to slower steering, less trail will make faster steering.

I have now 71mm trail and i might wanna change my fork to full carbon one (but they are all road forks) with 44mm rake vs. mine 35mm. New fork woud give me 62mm trail. Will i notice that difrence? Is it much? 71mm to 62.

No, less trail means 'slower' steering, as you put it.

Less rake means twitchier steering.

No, less trail means 'slower' steering, as you put it.

Less rake means twitchier steering.

Try again.

orilly?

All other things being equal, a bicyle with more trail will steer slower, less twitchy, than a bicycle with less trail.

Counterintuitively, more rake reduces trail and makes a faster steering, more twitchy, snappier handling bike.

Decent summary here,... http://www.phred.org/~josh/bike/trail.html, althought the diagram above is also very good and clear.

LRM will likely notice a change from 71mm to 62mm trail. It's pretty easy to get used to, though, and neither figure is low. I'd expect the handling to be improved by the change, as 71mm is seriously slack for anything other than a town bike or roadster. 62mm is pretty typical for a tourer, road bikes on average a bit less, track bikes less still. (http://www.kgsbikes.com/news/brent-stability-handling)

The other thing to consider not mentioned so far is the axle to crown fork length .. this will either slacken or tighten the headtube angle and effect the trial ..

Any of you guys able to tell roughly what the angle/ rake is on these forks?
Cheers

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Try photoshopping this onto it...[URL="http://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Protractor2.jpg/800px-Protractor2.jpg"][/URL]

40-50 (nearer 50) degrees but it's very hard to tell from that angle.

Was told they were around 45 but cheers guys. Just needed to know because I'm selling them

Just says it's raked up to go fast.

yeah steeep, do it
go faster
only with crabon frame

Such carbon. many angle wow