1995vmax500le
Member
hey i was just wondering if anybody could tell me the length that a 121-136 rail extension moves the back axle from its original position to its new position?? i want to make a set of tipped extensions for my viper and need to know the extension length so i can do some trig and figure out some numbers to make a set.
9801srx
Member
the axle needs to go back 7.5" 's
My advice . . .
If you are going to trouble of tipping the rails, then go at least 144 or even 151. The benefit of tipping 136 rails is minimal in my opinion. Also go with a 6 degree tip if you can instead of the common 3 degree tip.
I am of course assuming that you are wanting better flotation off trail without sacrificing turning ability on trail.
Mountain skis, and a 144 track make the Viper a totally different sled off trail. A 6 pitch Camoplast track is very nice too.
I installed a Nytro XTX 144 skid in a Viper and it made a huge difference. The skid is way better on the trails than the Pro-Action, and the 144 is way better off trail. I seen one recently for sale at $500.
If you are going to trouble of tipping the rails, then go at least 144 or even 151. The benefit of tipping 136 rails is minimal in my opinion. Also go with a 6 degree tip if you can instead of the common 3 degree tip.
I am of course assuming that you are wanting better flotation off trail without sacrificing turning ability on trail.
Mountain skis, and a 144 track make the Viper a totally different sled off trail. A 6 pitch Camoplast track is very nice too.
I installed a Nytro XTX 144 skid in a Viper and it made a huge difference. The skid is way better on the trails than the Pro-Action, and the 144 is way better off trail. I seen one recently for sale at $500.
BARON 8BU
New member
If you go to 136" at 7.5 center to center and tip it 3 degrees you'll raise your rear axle 0.4" and 6 degrees will get you a little better than 3/4". If you go 144" and 3 degrees you'll raise your rear axle 5/8" and at 6 degrees you'll be at 1 1/4" raise.
When I went from 121 to 144 I figured 11.5" back with no tip center to center and at the last minute changed it to 12" inches with no tip. When installed with a used 144" track it ended up being in the same position in the slot for axle adjustment as origanal 121". Hope this helps in your decision making.
If your using a CAD/CAM software to make them let me know and i could email you my dxf. file to give you some ideas.
When I went from 121 to 144 I figured 11.5" back with no tip center to center and at the last minute changed it to 12" inches with no tip. When installed with a used 144" track it ended up being in the same position in the slot for axle adjustment as origanal 121". Hope this helps in your decision making.
If your using a CAD/CAM software to make them let me know and i could email you my dxf. file to give you some ideas.
1995vmax500le
Member
hey ya that would be great if you could do that. i am a machinist by trade and love to make my own parts even if it is time consuming. i well be using cad and cam software to make the parts so if would be great if you could get me your drawing. i dont want to copy it but rather see what you have done and then go from there.