Offset issue on my 09 570

NKW570 · Jul 19, 2009

Ok, i think i may have mucked up here and need some help.

I removed the upper triple clamp on the berg and replaced it with a BRP clamp off of my ktm. The reason being the BRP has the risers and sub mount kit all attached for my scotts damper and is a nice bit of kit.
So i fitted everything and the damper works , got all the clearances etc, i also made a sleeve ring for the steering hole in the clamp to match the smaller tube size on the berg.

I now realise that the berg clamp marked 18-20 is centred to give 19mm offset and the BRP clamp has a 20mm offset :roll: .

Is this ok or do i need to change other bits ? Thanks.

mickj · Jul 20, 2009

offset

Hows it feel , 010 s are coming with a different offset 22 I :?: think

NKW570 · Jul 20, 2009

Re: offset

mickj said:
Hows it feel , 010 s are coming with a different offset 22 I :?: think

Hi, TBH, not a lot, i feel more difference moving the forks up or down in the clamps, although the difference between 19 and 22 will certainly be noticable.

No, my main concern is: Do you have to change both the bottom and upper triple clamps for correct offset?
At the moment i have the original berg lower at 19 and the replacement upper with 20 offset. I have kept the original steering stem tube and upper & lower bearings.
On the one hand i have been told 1mm is not an issue, just ride it.
On the other, its incorrect and needs to be rectified, so i'm confused.
If it is out of sync, then i would like to know my best options please.

Thanks,
Nick

Chas · Jul 20, 2009

RE: Re: offset

If I'm thinking correctly, if the upper clamp has 20mm offset and the lower clamp has 19mm offset, that would decrease the rake and therefore also decrease the trail giving the bike less self-centering effect making it somewhat less stable. The problem is that the fork tubes would not be properly aligned with the mis-matched triple clamp offsets

mud400 · Jul 20, 2009

Re: RE: Re: offset

Chas said:
If I'm thinking correctly, if the upper clamp has 20mm offset and the lower clamp has 19mm offset that would decrease the rake and therefore also decrease the trail giving the bike less self-centering effect making it somewhat less stabile. The problem is that the fork tubes would not be properly aligned with the mis-matched triple clamp offsets

Decreases rake.
Increases trail. Trail is measured relative to the head tube. Moving the wheel closer to the bike increases trail.

There is more too stability than just more or less trail. Ever had a grocery cart with a wheel that oscillates?

mud400 · Jul 20, 2009

NKW570 said:
Ok, i think i may have mucked up here and need some help.

I removed the upper triple clamp on the berg and replaced it with a BRP clamp off of my ktm. The reason being the BRP has the risers and sub mount kit all attached for my scotts damper and is a nice bit of kit.
So i fitted everything and the damper works , got all the clearances etc, i also made a sleeve ring for the steering hole in the clamp to match the smaller tube size on the berg.

I now realise that the berg clamp marked 18-20 is centred to give 19mm offset and the BRP clamp has a 20mm offset :roll: .

Is this ok or do i need to change other bits ? Thanks.

Both of the clamps should have the same offset. Bikes handle funny if the triple rake is different than the rake dictated by the head tube angle. The steering forces are non-linear, giving it a feeling of falling into corners.

Miss-aligned clamps can also harm your fork tubes, they are not that thick.

You are right though. It is only 1mm.

VIKING · Jul 20, 2009

NKW570
I have no way of proving this but I think that they had KTM clamps that had a adjustable steering offset ( eccentric steering stem) that's why you can read 18-20 on the clamps, Husaberg put in a straight steering stem you get 19mm offset so if you have got clamps for a KTM for adjustable lower clamps it should fit like a glove I doubt that you could fit a fork tubes into the two clamps it would not just slide in you had to do some prying and swearing in order to make them fit and if you did just that damage to the fork tubes is likely

later VIKING

Chas · Jul 20, 2009

Re: RE: Re: offset

mud400 said:
Decreases rake.
Increases trail. Trail is measured relative to the head tube. Moving the wheel closer to the bike increases trail.

Upon further reflection, this sounds correct.

Taffy · Jul 21, 2009

RE: Re: RE: Re: offset

i see some iriot from TBM tested the new 390 and proclaimed that the move from 19mm to 22mm yokes had been done to make the bike more stable.....he then proceeds to find the bike UNSTABLE to which he asked the test mechanics (i know not who but would guess at mid west perhaps) to tighten the compression damping all the way round?

you can always rely on TBM....

regards

Taffy

NKW570 · Jul 21, 2009

Thanks for the answers guys. At least i know i have the mismatch now on the offsets to contend with and the cause and effect.... which is me and = disaster :lol:

Viking, you are right, if i had the adjustable bottom clamp and eccentric tube, it would all be equal offset, but i dont and ive run out of money to buy anything at the mo.
You also make a good point about resistance when fitting, there was no real pressure applied so hopefully no damage.

How about this solution for the time being...shoot me down quickly if its wrong please.

The steering stem tube hole on my upper clamp was larger diameter than the 09 berg tube by 1.3 mm so i made a sleeve ring 0.62mm thick and pressed into hole to centre the steering stem.
How about, i take out the sleeve ring and make a half ring at 1.25mm and sleeve the hole again to the rear. This will position the stem tube towards the front and lessen the offset down to about 19.35mm when pinched up. Whadya think?

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Offset issue on my 09 570

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