Holy grail of frames I found it......

[86 400 XC]

I checked my 2 bikes once with a degree finder, i saw no difference.

unlike these 2, its so easy to see

 

[Picklito]

I checked my 2 bikes once with a degree finder, i saw no difference.

That's interesting. Of course, If you're just measuring the angle compared to ground, it would also depend on your suspension sag at that moment.

 

[Picklito]

Can Am's with adjustable rake? Eccentric bearing cups? Still sounds like just a trail adjustment to me. Does anyone have a photo?

 

[86 400 XC]

No sag, i was checking it because huskydog said here take a 84 frame with the steeper forks.
I will get some pics on the weekend, I know they were same lol but it was 3 years ago

 

[SteveJ]

Can Am's with adjustable rake? Eccentric bearing cups? Still sounds like just a trail adjustment to me. Does anyone have a photo?

I saw one of the adjustable rake Can-Am's at a vintage MX race two seasons ago. After puzzling over it for a while, I realized that it does change rake and trail rather than just than just trail. The offset on the bearings would change the angle of the steering shaft through the steering head. I believe the bike's owner said it could be set to either 27 degrees or 31?? (not sure). Here's a photo of the offset bearings I found online.

 

[Bigbill]

Different degrees on the fork plus a shorter or longer swingarm effects the turning radius. Which swing arm is shorter the cr or wr in the evolution bikes?

 

[Picklito]

SteveJ,
Thanks for that. You show exactly what I was hoping to see: The races are spherical, so you could change the upper or lower and yes, change the angle of the steering stem in the frame rather than just move it forward or backward. Very cool.

Bigbill,
Generally, the CR & XC were the same, but longer than the WR.

 

[Bigbill]

Wouldn't the longer swing arm add the extra two inches of travel on the cr & XC?

 

[Joe Chod]

No.
That's not how it works

 

[Picklito]

The extra swingarm length does add to the arc length, but the CR/XC shocks have longer travel, too.

 

[can]

 

[oldbikedude]

I thought the evo's swingarms were all the same length wr,xc,cr ?

 

[Bigbill]

Two different lengths.

 

[86 400 XC]

Single shock bikes all use the same length

 

[oldbikedude]

Thanks 86XC...I thought so

 

[justintendo]

yup, the end of dual shock/steel swinger was the end of the different length swingers. 83/84 still had 2 different lengths.

 

[Bigbill]

Is there an advantage to having two different length swing arms?

How about the different degrees of rake on the front fork?

 

[jimspac]

Can-Am shows the the angle is built into the bearing cups used as there are timing lugs on the cone races that require specific orientation to set the target fork rake.

 

[can]

Here is a picture of the Canam "cup and the cone". Made of aluminium, the cup is pressed into the steering head with the 2 grooves pointing to the front and back. The cone has one nub that allows it to be reversable.
Ingenious system which works great.
Outer diameter of cup is about 60 millimeters. So steering head is quite a bit bigger than a husky and would require welding in a new steering head tube.

 

[jimspac]

The reversibility gives plus or minus rake so you getting 2 settings from each cone set. A Husqvarna with that setup would really be the Holy Grail of frame.

A triple clamp with reduced offset will change the trail number only. Pulling in the rake angle produces the same effect