Geometry Difference 129 vs 137

[snowbeast]

Id say the rear arm would need relocating(scissors) to make it transfer more, but who knows for sure.

Dan is correct,if you were to drill a hole directly in front of your rear torque arm(scissor arm) you would do two things,one it will soften the skid a lot,and two it will transfer like crazy. I am not sure how many remember the old xc10 skids and old style cat skid before the ETT some came with two sets of rear torque arm holes in rails,so you could set it up for drag racing.

 

[cannondale27]

Dan is correct,if you were to drill a hole directly in front of your rear torque arm(scissor arm) you would do two things,one it will soften the skid a lot,and two it will transfer like crazy. I am not sure how many remember the old xc10 skids and old style cat skid before the ETT some came with two sets of rear torque arm holes in rails,so you could set it up for drag racing.

Yup. Had a 13 cat skid and my skid side by side 129" both the 13 skid the lower scissor is 1" forward. That skid has sag with heavier springs even. Anyone who has owned a M10 skid knows how much even 1/8" change in position of the angle of shock is. Night and day.

 

[stevewithOCD]

Dan is correct,if you were to drill a hole directly in front of your rear torque arm(scissor arm) you would do two things,one it will soften the skid a lot,and two it will transfer like crazy. I am not sure how many remember the old xc10 skids and old style cat skid before the ETT some came with two sets of rear torque arm holes in rails,so you could set it up for drag racing.

I wish i had time to "play" with these theories cuz a little more transfer & a little softer ride for my tiny hiney would be perfect...

 

[ROCKERDAN]

Just remember a small change in this location can be huge. And then it will sag more too, honestly this is not something id mess with unless I knew for certain how it would react...I suppose you can always move it back to original hole location.

 

[lilrez]

Again. I convered a 129 to a 137. Including everthing. Many differences,tunnel, rail positions, shock length, wheel size, etc. Not cheap. Lots of reseach. You can't use the 129 drop brackets. You can use parts of the rear arm. You can use the front arm and cut off the rear shock swing attachment. The trail ride was improved and i could carry still the skis on my 137 for a long time. Add picks add power your problems solved. I bought another 17 137. Love it. Fits a little nicer in my 10 footer due to the 2 shorter tail than the 16. If someone wants to drill a hoLe in their drop bracket I'd like to hear the results.

 

[SideHogger]

Just a thought, is it possible to mount the front arm in a different hole than what they come from factory? What would that change? There are , I believe, 4 holes there.

My bad guys,only 2 holes up front but now looking at rear scissors, why can't we mount them in the forward hole? I would guess it would lower rear some but maybe make it transfer better.

 

[snowbeast]

I wish i had time to "play" with these theories cuz a little more transfer & a little softer ride for my tiny hiney would be perfect...

Next year steve,heck come up to my little house in patten,and we can do some mods in the garage/workshop lol

 

[snowbeast]

My bad guys,only 2 holes up front but now looking at rear scissors, why can't we mount them in the forward hole? I would guess it would lower rear some but maybe make it transfer better.

Yes,it will,soften and transfer much better,the trade off will be bottoming out easier in bumps you never did in past. And if you install stiffer torsion springs,you defeted your transfer.