# what can you guy tell me about an RTI ramp

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by James90, Sep 3, 2001.

1. ### James901/2 ton status

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I am in the machining technology program at my local community colege

and one of my classes is metrology (measuring and gaging)
and some time this semester I have to give a presintation on some form of measuring not used in the machin shop

so I thot what would be better than showing how to measur flex with a RTI ramp but I dont know all that much about them I dont even know what RTI means

so could you tell me what you know about them or some web sites where i could a nuff info to give a good demo on how one works

thanks guys

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2. ### hammer1/2 ton status

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ramp travel index

3. ### tRustyK5Big meanieStaff MemberSuper ModeratorGMOTM WinnerAuthor

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RTI stands for Ramp Travel Index. It measures the amount of flex and assigns a number based on measurments taken when the vehicle can no longer proceed without a tire lifting.

the number is calculated by how far up the ramp the vehicle has driven divided by its wheelbase. A vehicle with a 100" wheelbase that travels 70" up the ramp scores a 700 on that ramp. Common ramp angles are 20, 23 25 and 30 degrees.

The ramp was originally thought up and built by four wheeler mag as a testing and comparison tool. The first ramps were 20 degrees, but as trucks got flexier the angles have increased.

Rene

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4. ### White Knight1/2 ton status

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The problem with ramps, are that they can be cheated on, postion of tire on the ramp and the air in the tires, but hey they're a great way to check befores and afters when you've worked on the the suspension. I would be aware that just because you ramp a certain number doesn't make it any better or worse on the trail...I know of a truck that ramps better than my Blazer but I go places he never thought of.

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5. ### tRustyK5Big meanieStaff MemberSuper ModeratorGMOTM WinnerAuthor

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Our club has a ramp...I like to keep the variables to a minimum when I ramp so I have reasonably reliable number to make comparisons.
Our general rule of thumb when we hold a ramp contest is "trail pressure" is OK and half of the tire must be on the ramp.

I agree a ramp queen does not necessarily make a great trail rig though.

Rene

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6. ### wayne3/4 ton status

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7. ### James901/2 ton status

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thanks guys

I might even get an A

i thank i might make a min RTI to ramp my 4 wheeler on to help give my demo and get what I am trying to tell them a cross

once agine thanks

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