1125R and XB front end interchangablility?

[Candyman]

Hello, just working on a front end swap on a project of mine. Just wondering if someone could shed light for me wether or not the top clamp on a set of 1125R forks would be the same as a top clamp on say an XB12R? I am thinking they are but have no way to confirm.

Any help in confirming this would be appreciated.
Thanks

[loose1]

No, the 1125 forks are spread farther apart than an xb.

[Candyman]

Excellent, just what I needed to know thanks

[FQP19]

Looking at this myself too, this helped me!..
http://www.buellxb.com/Buell-XB-Foru...olt-Conversion

[wolfo68]

The top triple from an 1125 will work on xb forks.

[jetlee]

The top triple from an 1125 will work on xb forks.

As previously stated, the 1125 forks are further apart. The forks may fit into the top triple just fine, but to properly use the top triple on an XB then you also need the 1125 lower triple, 1125 axle and spacers (not sure if the 1125 uses spacers or not, to account for the extra space between fork and hub).

Then there's the issue of caliper-to-disc spacing.

[EricZ]

There is no caliper to disc spacing issue. The wheel and caliper both locate off the right fork lower. The only issue is the fork to fork center distance difference of the 1125 vs XB triple clamps. I did the swap on my bike.

The 1125 and XB use the same front axle and bearing spacer, too.

DO NOT mix 1125 and XB triple clamps. Use only 1125 upper and lower clamps OR XB upper and lower clamps.

[jetlee]

If the 1125 puts the forks further apart and uses the same axle and bearing spacer, where is the difference in width made up?

Looking at the parts manuals, I can only conclude that the difference in width is made up by the lower fork itself. In which case, using XB forks in 1125 triple clamps without an additional spacer will result in triangulation of the forks.

-EDIT-
Or are you referring to the fork offset and not the fork spacing?
Offset being the distance from the center of the head bearing to the centerline of the forks.
Spacing being the width/distance between the forks themselves.

-EDIT-
If the issue is OFFSET, instead of spacing as the earlier posts suggest:
Of the information I have found, both bikes share the 21° rake. The XB's have 83mm of trail where the 1125 has 84mm of trail. This changes the fork offset from 30mm for the XB to 29mm for the 1125, if my math is correct.

While this would keep the forks parallel with each other, it would cause a change in rake (depending which upper and lower triple is used) and likely destroy head bearings quickly.

[jetlee]

What I'm trying to get at is if the issue is just offset then as long as you use both triples from the same model you are fine.

But if the issue is spacing (as posts #2 and #7 indicate), then there is more geometry that needs to be taken into consideration.

[Negative]

.............. This post blew my mind quicker than a high dollar hooker ...