Triumphrat

Jakemuay · 04-30-2008

Howdy all,

I bought a Bonnie top tree with risers from my local dealer to swap out with my Thruxton Top tree because, well because I feel like it.

I pulled off my Thrux tree and went to slide the Bonnie tree on and man are they different! The hole for the stem nut on my Bonnie tree is almost 1/8 inch farther forward from the stem hole on my Thrux trees.

Has anyone experienced this? My Thrux is a 2004 and these are new clamps from the dealer, did they make some slight alteration to the rake angle of the bike? I put the front wheel down to try and get the Bonnie trees on but they wont go without some serious hammer work, while my Thrux trees slide right on.

Any help is appreciated.

Jake

Bonafide · 04-30-2008

There's a rake/trail difference between the two ...
Thrux - 27º/97mm
Bonnie - 28º/110mm

Jakemuay · 04-30-2008

AH! That makes sense. Do I run the risk of damaging my forks by running the Bonnie top tree with the Thruxton's bottom? Looks like that LSL CEK kit is going to be kicking my wallet in the crotch sometime soon.

sweatmachine · 04-30-2008

yeah, it doesn't fit. You'd have to get bonnie lower trees, and it will change the trail numbers, but not the rake. They have the same frame, after all.

The trees aren't raked, but the offset is different as you've noted. (distance from the center of the forks to the center of the nut).

Jakemuay · 05-01-2008

Thanks sweat and bonafied. I even bought a D9 bracket for this whole setup. Bummer.