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PostSubject: Toe troubles   Toe troubles Icon_minitimeFebruary 16th 2018, 5:05 am

Have a issue with my plans. Putting 4wheeler a-arms on my mower but want massive movement. Problem being when suspension bottoms out both tires toe in. Does anyone have advice.
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PostSubject: Re: Toe troubles   Toe troubles Icon_minitimeFebruary 16th 2018, 6:31 am

Without seeing some pics and knowing your setup specs id guess its in your location of inner tierod pivot points. But if your a-arms have an offset between the location of upper pivot point and lower pivot point then that can throw a screwball into the entire mix (with figuring out steering pivot point placement).  

In side notes when useing an entire system off of an atv, your stuck with the geometry that they give you. Most of the time they design it with only three to four inches of wheel movement.  (for the knockoff 110 and such)

Sorry for the choppy post, im at work got to type fast before i get busted. Can post more on break.
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PostSubject: Re: Toe troubles   Toe troubles Icon_minitimeFebruary 16th 2018, 7:32 am

T-man go karts on Youtube has a good video explaining front independent suspension design on a go-kart that applies to what you're doing here. He talks about the same toe in problem.
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PostSubject: Re: Toe troubles   Toe troubles Icon_minitimeFebruary 16th 2018, 7:49 am

Thanks guys this will help. I am trying to put air bag suspension on ti
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PostSubject: Re: Toe troubles   Toe troubles Icon_minitimeFebruary 16th 2018, 8:51 am

I seen this topic and was thinking.... Man, I hope you are OK.   drunken


Toe troubles Sig115PROJECTS:
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PostSubject: Re: Toe troubles   Toe troubles Icon_minitimeFebruary 21st 2018, 8:54 pm

To keep the same wheel alignment while the suspension is moving up and down on the front end, the tie rods, and all 4 A-frames need to be the same width.

I'll give an example (example 1). The 4 A-frames are 12 inches wide from mounting bushing on frame to spindle ball joints (top and bottom A-frame), the tie rod needs to be 12 inches long, from the pit man arm to the spindle. For the wheels to stay straight while they are moving up and down the suspension travel.

Example 2. If the Tie rods are longer then the A-frames (from 1st example), say 14 inches wide, then suspension travel with wheel alignment would be-
-with A-frames straight out or in the middle of travel, wheels would be straight. At top and bottom of travel the wheels would be toed out.

Example 3. If tie rods are shorter then the A-frames (from example 1), say 10 inches wide, then suspension travel with wheel alignment would be-
-with A-frames straight out or in middle of travel, wheels would be straight. At top and bottom of travel the wheels would be toed in.

It is pretty rare for all 4 A-frames to be the same width. Most factory suspensions are usually designed with the top 2 A-frames being a little narrower then the bottom two A-frames and the tie rods wider then the bottom 2 A-frames and suspension would move-
- with A-frames in the middle of their travel or straight out would have wheels straight. With suspension all the way compressed the wheels would be tilted out on top and toed out. While suspension is completely extended the wheels are tilted in with toed in.

All examples are with the rider on whatever and the suspension is in the middle of its travel which explains the wheels always being straight in th middle of suspension travel.
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PostSubject: Re: Toe troubles   Toe troubles Icon_minitimeFebruary 22nd 2018, 2:16 am

Thanks for the info have been working on that very thing. Great advice and this is exactly why i love this forum. Thanks again for the info much appreciated.
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