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BIKELAND > FORUMS > ZX12R ZONE.com > Thread: Question about steering geometery NEW TOPIC NEW POLL POST REPLY
redelk


Moderator
Please... speak to the hand.
Posts: 3209
posted October 16, 2001 10:44 AM        
Question about steering geometery

The '02 12R rake has been increased from 23.5° to 25°. If I've heard this right, the trail measurement hasn't changed. Is that right? I thought the two measurements were related and if you change one, you'd be changing the other... in most cases.

The "question" is this, wouldn't this increase in the rake make the bike turn slower? I've raised my forks a 1/2" and have tried to shorten the wheelbase by moving the rear wheel as far forward as possible (when I changed the chain). I've even tried a 120/60 up front (bad move), all it trying to quicken the bike's response to steering input.

I'd think that the increase in rake would have just the opposite effect.
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There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.
-Ernest Hemingway

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KawRider


Expert Class
Posts: 329
posted October 16, 2001 11:12 AM        
Steering Geometry

I raised my forks (meaning lowered the front end) this weekend, after installing the Muzzy Dogbones (center hole). I believe I lowered the front too much (about 3/4 inch), because the bike turns in too steeply now. I am going to try 1/2 inch. A small change makes a BIG differance.

Tim

00 12R

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Tim
Black ZX-14

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Earl


Parking Attendant
Posts: 29
posted October 16, 2001 11:21 AM        
Your are right, it does make a big differance. You can change the rake and not change the trail depending on the offset of the triple clamp. I sure do not know all the hows and why's but 25 is the same rake of the old zx-11. It seems with the heavier crank, non-concentric throttle, and increased rake that they are trying to make the bike less of "a handfull". All of these changes seem to be focused on making a slower reving, slower steering but maybe more stable unit than it is now. As I commented in an earlier post, I would think it would not wheelie near as quick as it does now. I thought about an 02, but I am going to wait until it comes out and see if my assumptions are correct. If so, I will pass and put a gsxr-1000 with the 12 and Busa.
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redelk


Moderator
Please... speak to the hand.
Posts: 3209
posted October 16, 2001 11:44 AM        
I just read in RRW

(aka Road Racing World) that the slightly lower handlebar posistion could possibly address the wheelie aspect as well. This is done shifting the operator's weight balance to a more forward position. I'm speculating that this position would also give the rider a feeling that the steering isn't really that much different then previous models.

With many wanting to raise their bars (via Helibars, etc.), I'm the opposite. I'd like to LOWER mine and throw on a rear set. Still, I also know that replacing the top of the triple clamp with a '02 version (if even possible) and a rear set are two items that will be just out of reach of my wallet.

For me, it looks like a 10R in '04.
____________
There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.
-Ernest Hemingway

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