• Welcome to RCCrawler Forums.

    It looks like you're enjoying RCCrawler's Forums but haven't created an account yet. Why not take a minute to register for your own free account now? As a member you get free access to all of our forums and posts plus the ability to post your own messages, communicate directly with other members, and much more. Register now!

    Already a member? Login at the top of this page to stop seeing this message.

Optimal Front To Rear Link Length

JC3

Quarry Creeper
Joined
Mar 31, 2019
Messages
266
Location
Low CG
Is there an optimal front to rear link length or ratio of front to rear length?

I read through the 4 link stickie and did a search but didn't see anything related.
 
from my understanding no. what ever it takes to get " perfect" link setup front to rear and your desired wheel base. link length will play a factor in your mounting locations

i have a truck with 180mm rear links and little shorter then scx10.2 front links and its speced out perfect on a 4 link calculator and truck works flawless
 
from my understanding no. what ever it takes to get " perfect" link setup front to rear and your desired wheel base. link length will play a factor in your mounting locations

i have a truck with 180mm rear links and little shorter then scx10.2 front links and its speced out perfect on a 4 link calculator and truck works flawless
Interesting. I thought for sure there was some optimal ratio for a given chassis design. I tend to overthink things. Haha, time to make some links. Thanks!
 
From my understanding link length front vs rear doesn't affect allot of difference, but link length top and bottom is the bigger thing to change how 4 link reacts
 
From my understanding link length front vs rear doesn't affect allot of difference, but link length top and bottom is the bigger thing to change how 4 link reacts
Thanks. That makes sense since they affect squat and of course pinion angle.
 
Yeah length can be whatever its the link locations that matter.
It just kind of amazes me that it doesn't matter otherwise. I always felt that it had more to do with chassis design than just wheelbase alone. However, I've been wrong many times before! lol Thanks.
 
It matters hugely.

The longer your links the more suspension travel you can have. At some point stability becomes an issue. Shorter, less movement but better control. Also matters on how you do your weight. It seems best to have weight more forward. Your trans is probably one or the heaviest sprung weight components so you want it more forward. Your links attach to where your trans sits so you probably want your transmission more towards the front than the rear. You want shorter links in the front longer in rear for for weight and control.


Your chassis will determine things more or less, esp for your front links. Your front is heavier and therefore I would rather have less susp movement up front and allot more in the rear.
 
Last edited:
It matters hugely.

The longer your links the more suspension travel you can have. At some point stability becomes an issue. Shorter, less movement but better control. Also matters on how you do your weight. It seems best to have weight more forward. Your trans is probably one or the heaviest sprung weight components so you want it more forward. Your links attach to where your trans sits so you probably want your transmission more towards the front than the rear. You want shorter links in the front longer in rear for for weight and control.


Your chassis will determine things more or less, esp for your front links. Your front is heavier and therefore I would rather have less susp movement up front and allot more in the rear.


I think you're spot on with your observation about forward weight bias and how it's affected by the links and the transmission. I totally agree. Thanks!
 
Shocks determine Suspension travel. You could have 10 foot long links with 80mm shocks and you wouldn't get any extra travel. I'm thinking longer links will help keep your pinion angle the same even if you're off on the link placement.
 
Shocks determine Suspension travel. You could have 10 foot long links with 80mm shocks and you wouldn't get any extra travel. I'm thinking longer links will help keep your pinion angle the same even if you're off on the link placement.

Change out to short links. Then mount them out further on your axle. You will gain stability and loose travel. Take a shorter pair of shocks ( not allot shorter) and mount them toward the center of your RC and take a longer pair and mount them facing away from the center of your RC, you will loose travel.

Shocks deal with the way susp can move and can be used as a limiting factor. The length of your links and you suspension geometry tell you how far they can move. Straight axles attched to links will travel in an arc towards the center of any vehicle. The longer the links the longer this arc can be top to bottom. The closer the links are mounted to the center the more movement you can have side to side.
 
Back
Top