Front Suspension Bump

R

richardh

Member
Supporting Member
Joined
Aug 25, 2023
Messages
48
Location
Los Angeles, CA
I'm cycling my suspension to check clearance's and bump. Here are a picture of the driver and passenger at full bump to the bottom of the shock. This is a RockJock bump stop kit. Is this enough bump stop?

The top bit is rubber, the bottom bit is hard plastic.

Driver
PXL_20240324_183817565.jpg


Passenger
PXL_20240324_183939224.jpg
 
Can't tell from the pictures if anything is making contact before the bump stops.

Ideally the bump stops are set to stop axles, arms, moving things from crashing into other things.

That and not driving the bottom of the shock through the shock body.

-Mac
 
Everything clears by miles when the bottom bump stop touches the top one. My concern is that the top bump stop is rubber (circled in red), and the shock is all the way compressed (circled in green) just using the jack. Under load offroad, will the rubber top stop compress more? Should I add more spacer under the bottom or top bump stop?

PXL_20240324_183939224~2.jpg
 
I would add some fender washers or something similar to your lower bump stops. You should try to have about 1/4 to 1/2 inch of the shock shaft showing at full bump. From your pictures it looks like your shocks are almost, if not entirely, bottomed out.
 
Ignore everyone else who has not used these bump stops. These are different than stock where they can be made to be a hard stop. Instead, the shock is your hard limit to up travel.

You want about 3/4" of shock shaft showing at the very first contact of the RockJock bumps. If you can find the Currie/RockJock instructions, this is what they say to do.

The soft rubber jounce on the Fox shock shaft is not part of this 3/4" shock shaft measurement. It is soft enough that it will get squeezed out onto the ground. I cut mine off.
 
06lj said:
I would add some fender washers or something similar to your lower bump stops. You should try to have about 1/4 to 1/2 inch of the shock shaft showing at full bump. From your pictures it looks like your shocks are almost, if not entirely, bottomed out.
Click to expand...

I've seen everything from 1/4 to 3/4" for that figure on the Currie stops. Does Rockjock actually suggest anything in particular? I didn't see it in the install instructions and I don't have a good way to estimate how much it'll compress. Guess I could put a zip tie around the shock shaft and go hit a curb at progressively higher speeds.
 
richardh said:
Thanks for the advice. The shocks are bottomed out. That's what got me concerned so I asked.
Click to expand...

As they should be. The purpose of the bump stop is to slow down the travel speed before the shock reaches full compression.
 
jjvw said:
Ignore everyone else who has not used these bump stops. These are different than stock where they can be made to be a hard stop. Instead, the shock is your hard limit to up travel.

You want about 3/4" of shock shaft showing at the very first contact of the RockJock bumps. If you can find the Currie/RockJock instructions, this is what they say to do.

The soft rubber jounce on the Fox shock shaft is not part of this 3/4" shock shaft measurement. It is soft enough that it will get squeezed out onto the ground. I cut mine off.
Click to expand...
This is the link to the instructions. I couldn't find where they gave instructions on proper bump measuring.

So cut out the rubber bit highlighted here:
PXL_20240324_183817565-EDIT.jpg

The soft rubber jounce on the Fox shock shaft is not part of this 3/4" shock shaft measurement. It is soft enough that it will get squeezed out onto the ground. I cut mine off.
Click to expand...
And then 3/4" as measured from the shock mount to the bottom of the cannister? So, I measure between the shock hard bits, and get rid of the rubber bit.

PXL_20240324_183817565-EDIT(1).jpg
 
Last edited:
  • Like
Reactions: TheBoogieman
Follow what jjvw says. If you need additional bump stop, I have used send cut send to make additional spacers. I believe rock jock offers the lower spacer but it’s 1” think only.

Send cut send has a template online for a circle with a hole in the middle, you just have to spec the dimensions so it’s real quick to order, they have a variety of aluminum thickness to choose from so you can order exactly what you need.

Lower spacer is roughly 3.5” in diameter with a .55 hole in the center. I used .5” thick aluminum and the cost was 15 bucks each and were at my door in under a week.
 
  • Like
Reactions: LJtobey and jjvw
Top Bottom
Back